How Install PerTronix Electronic Ignition on a Volkswagen!

[@Tikicar]

Been using Petronix in my Thing for two years and no problems. I switched for the same reason. I'm a fan of points but the new ones just are not as good. You didn't show setting the gap between the module and magnetic ring with the plastic gap tool included. Also adding a tiny bit of dielectric grease between the mounting plate and the module can help prevent it from getting overheated. I carry a spare petronix module instead of points or another distributor. I've replaced dozens of modules in GM HEI distributors and always carried a spare in those cars and trucks we had over the years. I've had Ford and Mopar electronic modules fail too. Never decided to convert those cars to points. Things break and we fix them. Having fun with old cars and expecting problems and being prepared, staying calm and problem solving is just one of the things that make VW Life one of the best channels on KZbin. Thank you for another great episode.

[@jamesquintana9137]

I have been using these Petronix electronic ignitions in my VWs for the past 25 years. They are much more convenient than using the points, and seem to give my engine a much smoother idle and acceleration. Can't live without them!

[@VWLifeVW]

yeah looking forward to it!

[@campion05]

Great post. My 1641 had it's flat spot with the original 009 even with electronic ignition. Changed over to PerTronix vac advance distributor w/electronic ignition and quite a measurable difference was noticed especially going slower in low gears and giving her the gas. No more staggering to get a move on. Keeping the 009/electronic ignition w/o vac advance in the frunk as a back up.

[@andrigtmiller]

One thing that this video reminded me of is spark plugs. I have switched to NGK Irdium plugs. They make a really big difference. They improve fuel economy and improve power. On my '86 Doka Syncro my fuel economy went from 17 to just under 22 mpg, and the power up hills was noticeably better. I have a 2.7 liter waterboxer from GoWesty in this. In my '73 bug with a 2110 cc engine, I had similar results. Not as much improvement on the fuel economy, but you should could feel the difference on acceleration and going up steep grades. Even for a stock or close to stock engine, you'll get much better results. For you guys driving these old buses, you will definitely notice the difference.

[@jid2905]

I am going to try this.

[@Tom-x9d]

Thanks !

[@Gasman208]

its unlikely this is due to change of manufacture alone

[@andrigtmiller]

@@Gasman208 Are you referring to changing the plugs? It doesn't matter who makes the plugs, but the fact that the Iridium plugs are better. You could use anybodies Iridium plugs and probably get similar results. In both cases I used above, both had brand new engines in them that had been through the standard break-in, both on the test stand, and then driven for a could 5,000+ miles. So, the original plugs were not warn, the engines are completely broken in and in peak condition, and I made one change, which was to the Iridium plugs. You change one variable on a new engine that is broken in properly, then the results are because of that one change.

[@spaghettiopizza8686]

i enjoy watching engine work on old VWs, thanks for posting this !!

[@iraforleiter7954]

No adjusting of points - and no adjusting of timing either! I converted to electronic (Pertronix) ignition 4/5 years ago - 'bout time you guys caught up 😉 BTW: I kept my Bosch blue coil and it works just fine.

[@vayabroder729]

Yes; the blue coil works fine as long as the resistance is within the Pertronix operating parameters.

[@VWLifeVW]

well you still have to set and adjust timing from time to time :)

[@bruceaskin9645]

I fitted a pertronics unit into my v8 holden van , Whilst it did eventually fail after about 10 years, it didnt just stop , started misfiring periodically, gave me plenty of warning . It continued to run for the next three weeks until a new one was posted to Australia. Now comes the stupid part, I went on an interstate trip with the new unit in the glove box instead of installed. It finally failed in the middle of a forest, in the middle of the night, in the middle of winter , in the rain. What a joy , replacing it by torch light, whilst soaking wet and freezing.

[@andrewg2703]

Put this set up in my daily driven ‘65’ Type 1 a couple years ago. . . Never looked back! Actually went with the full Distributor/Points/Coil set up with Mech. & Vac. Advance. It’s really nice not having to worry about it. Almost 2 years now and have had no issues.

[@VWLifeVW]

That's awesome to hear we are really really looking forward to seeing how this pans out

[@vwextraordinaire1013]

I was coming home from our club event in my '79 Super and took about a 3 mile detour to see where someone lived and then continued on and the engine died within a mile of home. The piece that opens the points didn't wear, it just cracked and flopped over. When I got my '67 bug I installed an EMPI distributor with "electronic" ignition and it just burned up one day. It now has a Pertronix installed. Years ago I had a Pertronix in my '69 bug and it worked great.

[@paulricketts1089]

The problem is with the points 😂. There are 3 different types of 044 type points. You can still get the good ones but they cost about $17.00. The other 2 types have either black or white plastic friction blocks and are garbage. Think with your brain instead of your wallet. It solves most problems before they happen.

[@tiyukitv6508]

Have a great day always guys. keep safe and just have fun with your vw's😊✌️

[@richlijacanacua]

This is awesome distributors set! Petronix. Thank for sharing. This is the solution for the thousand miles on travel.

[@richrocketlll]

I use a pertronix system in my bus also my porsche 914. They work great. Make sure you match the coil, module and plug wire set.

[@Misunderstoodboygenius]

It’s important to note you are pulling out the whole distributor, including the clamp. That way it maintains your timing.

[@VWLifeVW]

yes good point not sure if we made that clear!

[@tapper701]

@@VWLifeVW Speaking of points ...

[@austinswallow]

We have the same problem in the UK with duff points from both "Lucas" & "Bosch", not only that, but condensers and rotor arms. I think the problem is that they are no longer "Made in England" or "Made in Germany", they might be packaged as such, but they come from China or some other place where manufacturing quality is to a poor standard. Here in the UK we have a "Distributor Doctor" and he made good quality rotor arms and coloured them red, the faker then started to do them red, so he now stamps them with "DD", buy from him directly, buy genuine. I had Pertronix on my 1965 Rover - 16 years, no problem, it was positive earth, so a different kit, I did once make a mistake and reconnected the battery around the wrong way (a momentary lapse), wouldn't start, took me a while to figure it out, when I realised my mistake, it was 'oh no', all the electronics will be fried, but no, it started right up, lesser ignition kits would have failed (Made in China...), but buy quality "Made in USA" it works, any car I get, it is Pertronix always, even on vintage cars, they make a kit! Pity Gary did not put the plastic sleeve on those Lucar connectors! Why didn't you just turn the engine over 180-degrees to get the position marks back in synch? It doesn't matter, although it helps to get the plug leads in the correct order - how did that happen!!! Thanks for sharing, greetings from the UK!

[@johnbarry8238]

I just put this on my 66 bug,literally yesterday, and pulled the same boneheaded mistake on the plug wires as Matt Jackson did. 🤦‍♂️😁 Great video as usual guys!

[@RRmeanmachine]

Like Forest Gump said, "It Happens'

[@vonwesty3544]

Glad ya'll went with a Petronix system. I've always had great experiences with their products. Bosch is riding on their past reputation, and a lot of their products are inferior to what they used to to make.

[@johnnewcomb1128]

Thanks guys for the great tech session, it makes sense to use the whole kit. My son mixed his plug wires just like the I did when I was his age Peace

[@slimpickins3425]

Nice vlog boys! Ive had the Pertronix in my 72 beetle for years, for whatever reason I had to switch plug wires but runs great, the only thing you have to be careful is leaving the key in the on position with out the motor running, they say that will burn out the module, then your screwed, and there not cheep Good idea to carry the old dis. set up and ready to go. Happy Memorial Day to you and the gang! FYI, I finished fabricating all new windshield channel (bottom and both lower curves) and just sprayed the nose, that looks brand new, unlike the rest of the van! Now the dash is back in and just hooking back up everything. Cant wait to get her back out on the road!

[@VWLifeVW]

wow slim that's great progress! glad to hear you getting stuff done :)

[@trevor-ck7jk]

I have watched many of your videos and.always thought you were saying Mad Jackson but heard Matt Jackson this time. Also no vacuum line needed for advance? Enjoy your channel Helps a lot with my 71 Riviera build.

[@scotwheeler5789]

Enjoyed the video guys. I run Petronix in all my cars. My Westy and my 2 liter IDA motor. Never any ignition issues. Thanks for the tips and keep us posted on how they hold up for you. Tell Gary I’ll see him in Indy! 😆

[@VWLifeVW]

sounds good scot! They drove through the night and should be there soon

[@TheParvTubeShow]

I am so excited to work with you all this summer on July!!! Parv

[@charleslawrence7194]

Neat stuff but a little complicated for my bay window feeble mind. Good luck on the trip. It will be HOT so stay hydrated and be safe. Looking forward to the video of the journey.

[@RRmeanmachine]

Charles, It really is a pretty simple install. You can do it!

[@rundoetx]

I really enjoyed this instructional video. Cant wait for ya'll to hit the road and prove how dependable that new electronic ignition works. Thanks for posting.

[@VWLifeVW]

Fingers crossed!

[@robertlambert5299]

Can you guys share a link to the crimpers?

[@peterschweizer659]

Can you provide the link to the wire striper and the wire crimper you used

[@jid2905]

I have used these for many years. Great products!

[@VWLifeVW]

Great to hear!

[@daveayres950]

Absolutely brilliant video some brilliant information keep all that info coming to us brilliant your thanks chaps

[@Thomas-fo9zu]

Great video gentlemen, thank you for that and specifying between the K and the M distributor, I'm sure that will help someone out.

[@XX-io8wg]

Sweet, I’ve been hesitant to ditch points but this video convinced me to try em out. Drive safe boys! 🤙

[@VWLifeVW]

Go for it!

[@tapper701]

Simply put " Respect " and not talking Aretha here ... Not one who is mechanically inclined ... My scope of working on a vehicle : wash, wax, vacuum, oil change, check tire pressure & drive - in no particular order ... Much involved in mechanical aspects of a vehicle & those that can assess issues, do the work & "Get your motor runnin' - head out on the highway" ... (yes a Steppenwolf reference) are Born to be Wild = VW Life ! Slainte' ! Cheers !

[@VWLifeVW]

thanks Mark! rock on

[@Tom-x9d]

I like the video ! Not sure why we had to replace the old ponts first !

[@davidryan573]

Great how to video, excellent hints, love the laugh end, thanks Guys.

[@VWLifeVW]

Glad you enjoyed it

[@MrKrink545]

Please more tech videos. That was awesome and wrench time inspiring even though it was a simple upgrade.

[@VWLifeVW]

Okay

[@chrisfreemesser5707]

Uncle Tony's Garage has seen the same problem with points on his various Mopars...apparently the Eichlin points sold at NAPA still have a "proper" rubbing block and don't suffer from premature wear I get the appeal of replacing them with an electronic ignition but if the quality of other aftermarket parts is going down the toilet, how do we know the same can't be said for the quality of Pertronix's stuff?

[@VWLifeVW]

this is good to know someone else mentioned the NAPA points too thanks for the brand name! Well Chris it's definitely a concern, that's why we are going to thoroughly test these points and get back to you if we have problems. Our three buses are driving to New Mexico next week across Texas. that's about 4500 combined miles of driving, stay tuned :)

[@daveglick5152]

it is about time you guys woke up and smelled the burning points. electric fuel pump next please. cheers

[@VWLifeVW]

ha ha ha, slow down there we can only upgrade on thing a decade :)

[@brianchisnell1548]

I like points. They never leave you stranded.

[@VWLifeVW]

we will still have some on board at all times just in case :)

[@brianchisnell1548]

@@VWLifeVW haha! You just proved my points! (Hehe) i like tune ups anyway. Cheers!

[@FranciscoMartinez-jv9yz]

You guys are the VW masters 🙀🙀🙀🙀🙀🙀🙀

[@VWLifeVW]

i don't know about that but thanks :)

[@tomasalvarez6040]

Great vid. Im still bit confused…my petronix ignitor 2 kit, has: 1 module on a half moon base, and 2 half moon bases with 2 long screws. What are the 2 half moon pieces for?

[@rayaguirre4237]

Update: the pertronix coil I was running is the #40511 oil filled and SHOULD NOT be mounted upside down as most of our regular coils are. If you are going to mount it in the stock location (which is upside down) then order the Epoxy filled #40611. This is a $50 lesson that I have learned. VW Life at it's best!

[@jimnespor1818]

Great! I too will now make the switch! As for the coil, "Epoxy" filled or "Oil" filled?? (it appears one has a choice).

[@billfish5913]

In the late 1970s I had a 1976 MG Midget with electronic ignition. I was excited because no more setting points like on my 71 VW Bug or my 73 VW Bus. EXCEPT!!! The electronic ignition amplifier $120, would melt in the Round Rock heat in the Texas summer, leaving me dead in the water. Until I installed a new electronic ignition amplifier. No Bueno. I’ll be curious to see how your Pertronix set up serves you. I set the new Bosch points in my 1976 VW Riviera about 8 years ago and no problems. I must have gotten new old stock Bosch points from The Bus Depot. But thanks for the warning about the change in quality of Bosch points. Ragafritz! Pardon my French.😎

[@VWLifeVW]

hey bill thanks for sharing! and yes we shall see :)

[@mastorna]

I’m running Pertronix 6v and under load the engine misfires badly. I had the red wire from the dizzy going to the coil. Reading up on it, it sounds like it’s cause a voltage drop at the coil and the suggestion instead is to run the red white to a keyed source for 6v. Any tips on what the best setup for that is on a stock 1200?

[@zimms-world]

Great video…good information as I’m deciding whether to go with points or pertronix

[@VWLifeVW]

you could always do it later as a phase 2 upgrade on your project if you already have points. But so far we like them

[@crackpotts5347]

That's a funny co-eenky-dink, I just happen to finally take Gary's advice this week and went electronic. LOL Thanks gang!!

[@RRmeanmachine]

Frances the Bus on the road!

[@juanjorgemourra6695]

Hi, thanks, for my distributor 205 M do you know the Pertronix part number module?

[@VWLifeVW]

1849 or the 1847V - but I'm pretty sure the 1849 - if you purchase through pertronix website. use VWLIFE for a discount code and save 10% 😎

[@juanjorgemourra6695]

Thanks, you explain that the plate M vs K is different, that is why my question for K 1849 but for M I did not find a fit, think is 1847v but I am not sure by the dist cap height

[@juanjorgemourra6695]

Thanks for the VWLIFE code!!!

[@vwextraordinaire1013]

Sometimes I'm a little blind, but I'm not finding a link for the crimping tool Gary is using for the connections. I've always wanted one.

[@rayaguirre4237]

Finally had a chance to install my new electronic ignition system. It all went flawlessly. But wait, now 2 months later and under 500 miles on this setup, the Flame-Thrower ignition coil has stopped working. Primary resistance is 0 ohms instead of 3 ohms. POS! Had to go back to my original coil and points & condenser distributor setup. So much for trouble free ignition system!

[@cristianpena5061]

Does it matter the type of plug wires, for a pertronix distributor?

[@fromthebeginningofvankind28]

Great video but I don't see the link to the strippers can you send me the info so I can check them out? Also do you recommend the same length blaze cut for a bus and a early beetle? thanks guys keep the vid's coming

[@backyardkombi5466]

Thanks for the tutorial guys.

[@VWLifeVW]

Our pleasure!

[@allanfoster6965]

More VW magic! Bootyful!!😁👍👍

[@VWLifeVW]

You got it!

[@yoshinoyajones8924]

I would just like to point out that stock guys are not left out in the cold, but in 2003 I put the 6volt pertronix in my 58' sun roof bug. the guy who bought it still runs the pertronix and says its still 6 volts.

[@yttkuar]

A very timely video! Thanks

[@VWLifeVW]

Glad it was helpful!

[@firearmsfred]

quick question. 73 vw bus bay window, got new points and connection of condenser inside distributor is loose. used napa points CS313P. I don't think it's a good idea for that wire to be bouncing around inside the distributor. Advise?

[@stephensapp7233]

Any videos coming regarding the dwell meter and how to read it? I cannot seem to find one that looks like yours with a red, black, and green leads with a clamp for #1 spark plug wire.

[@VWLifeVW]

you might find different kids of dwell meters so don't worry too much about brand or style. once you find one you just want the reading to be between 48-52. and remember the higher the gap the smaller the dwell.

[@thaddeuskobylarz9896]

My rotor does not go fully down on my '69 VW bug because of the magnet. Did I buy the wrong PerTronix unit? I bought a 1847V unit.

[@gerardobarajas4254]

Do you have to put a Ground wire for the coil plus the ground from the electric ignition?

[@runedharma22]

Can't find the grippers in the link. I got the little screw tool.

[@robertlambert5299]

Can a stock black coil or Bosch blue coil be used instead of the pertronix coil?

[@vayabroder729]

Yes; just make sure the resistance on the coil matches the requirements of the Pertronix.

[@kptstyle423]

I wanted to do this to,my 1.8 8v a few years ago but didnt know what to buy but I havent adjusted points since lol

[@VWLifeVW]

ha :)

[@brucecollier5134]

wonder if this could help Lucy out..

[@jimmywilkinson9190]

Gary I got some points that are heavy duty NAPA points that seam to be OK . I had the cheaper ones that closed in 2 weeks ?

[@VWLifeVW]

oh interesting thanks for sharing! that's good to know.

[@VWLifeVW]

someone else mentioned this ... "" Eichlin points sold at NAPA still have a "proper" rubbing block and don't suffer from premature wear "

[@moss1transcendant]

The pertronix gear are matched impedance which are different to the stock VW ignition parts and that's why you can't mix n match in general.

[@vayabroder729]

Actually the Bosch blue coil works; as long as the resistance is within the Pertronix operating parameters.

[@jeremiahlord6094]

Did you/do you have leakage coming from the coil? I got the same model coil and it started to leak(not even 1 year old).. I just had to swap to the epoxy flamethrower. They wouldn't accept warranty because it was mounted upside-downish...

[@VWLifeVW]

No not yet but it's basically still new

[@james66872]

What do you guys think of the Fitech fuel injection system?

[@VWLifeVW]

Lot's of guys have been having great Success with the FiTech systems. I like the FUEL TECH setup .. but run an old CB quicktune in the 68.. Done right most of those systems are very useable.. Thanks for watching, Tommie

[@Jessie-ec5nf]

any idea what kind of pertronix module mactches into my mitsubishi 4g32b?

[@craigvwdude]

any updates on how it's holding up?

[@VWLifeVW]

so far so good

[@Jayvans_Super]

Nice clean up Matt Jackson @1:37, can I get an Amen @15:06

[@VWLifeVW]

ha ha yeah :) AMEN!

[@nealchristensen1793]

So what's the advantages to vacuum advance distributor to a 009 ? i have be running pertronix electronic distributor for year's without there spark plug wire or coil is there really that big of difference with there coil and there wire's ? Great video ! Thank you !

[@VWLifeVW]

a more smooth power curve is what i understand.

[@Wiencourager]

Optimum timing is dependent on engine. Load, at light loads you can run more advance. A centrifugal only 009 cannot adjust to engine load. You get better throttle response m and better highway mileage. But you need a carb that proves the correct vacuum signal.

[@Mojobaggedbnz]

What is your opinion on Accu spark ⚡️?

[@RRmeanmachine]

Never used them, sorry

[@russellmancillas4464]

Very good video, learned a lot

[@daveayres950]

This is a next job I want to do on my bug

[@VWLifeVW]

Cool

[@rayaguirre4237]

Update: after I called Pertronix, my order is on it's way!

[@santabubba50]

Thanks guys, very informative

[@VWLifeVW]

Glad to share!

[@hylndrfan]

Hi guys. Just wondering if I swap back to the old distributor with points in an emergency do I have to swap back to the old coil too?

[@VWLifeVW]

as long as you use a 3 OHM coil you can go to back to points. it's the low 0.3 ohm coils that will burn up points/condensers

[@Scrib2004]

Good tech session!

[@VWLifeVW]

Glad you enjoyed it

[@rx7what]

I couldn’t find the link for the crimpers in the description? Did I miss it or is it not there?

[@VWLifeVW]

No we forgot to add it

[@luebkeb]

Where the link for the little nut grabber tool. I see the one for the screw, but not the nut one.

[@VWLifeVW]

Couldn't find it on Amazon

[@kennethswain6313]

Do they make a set up for 6v? I’m running every thing like it was 1965. So I’m on the fence-🤞

[@tommiesmith3369]

6v is available

[@jeffowens2051]

I “might” need to do my 72 1302, but it is an oddball… 1600dpdr, 30/31pict, dvda dizzy that the local “aircooled expert” stuffed in to replace my dual Kadron 2332… without my permission… Iong story involving my late f-i-l, pickers and my wife’s 68 Beetle that also got stolen.

[@danvillareal9996]

l changr my ignition system for electrinic on my super beetle in the mid 80 !

[@jerryl4940]

Good job fellers

[@VWLifeVW]

thanks Jerry!

[@WildBillFlysRC]

Hey VWLife people, Not sure if you were following the guy Jesse Koz? He was driving his VW bug from South American to Alaska, his trip was cut short, he and his golden retriever were killed in a head on collision a few days ago 😔🙏

[@VWLifeVW]

hey Bill yes we saw that, such a tragedy :(

[@awsomeassistantthebest1825]

You might want to get with pertronics and ask them but I believe you won't be able to use that coil for the set of points if you break down that's a 30,000 volt coil there FYI..---- I had electronic Ignition in my 64 bug for years and never had an issue with them good luck guys..

[@VWLifeVW]

thanks!

[@GT.Bugger]

Good informative video guys.

[@VWLifeVW]

Glad you enjoyed it!

[@mightyquin4955]

When you head to NM I would love to meet you guys, I am in Roswell if you go through that way.

[@VWLifeVW]

we are heading up next week, not sure of our plans yet

[@RRmeanmachine]

Well, New Mexico Bus Bash is currently in a holding pattern as the US Forest Service has closed Lincoln National Forest due to fire danger. THose folks need some rain!

[@ivanhernandez328]

Hello would you mind sharing part numbers, on all 3 items from Pertronix? Thank you

[@VWLifeVW]

All three are linked in the description of the video thanks

[@ivanhernandez328]

Thank you for all you guys do for the VW community. Am assuming for 009 distributor is a different part number?

[@VWLifeVW]

@@ivanhernandez328 yes sir if you have any questions call them they will help you

[@ivanhernandez328]

Thank you again, hope to visit Texas soon and stop by to say hi

[@fakhroo5]

Thank u , for the video.

[@VWLifeVW]

Welcome!

[@livinthelife6056]

Yep yep time to go electronic god video !!

[@VWLifeVW]

You know it! we'll be testing it for sure with a 1500 mile road trip we start next week!

[@danvillareal9996]

where is Per Tronix made ?

[@tommiesmith3369]

Should of STOLE the negative side spade terminal on the blue coil. that way the Positive still have 3 post.. JUST SAYIN' 😉

[@jimmywilkinson9190]

When Matt Jackson goes to work !!!! Put a old dist. in there and take his ?????? JUST SAYING 😊

[@tommiesmith3369]

@@jimmywilkinson9190 I'm ON IT! .. He'll never know !!! 😉

[@hanknipper3921]

Little Dude said Cal Van yep we sold those at Mr Auto Parts!

[@RRmeanmachine]

YES we did Big Dude!!!

[@nicktelesco4950]

8vt coil or 12 VT coil

[@VWLifeVW]

12

[@Jessie-ec5nf]

Great video...

[@briancohen1967]

I have a 67 squareback with a 1600 twin port I can't find a electronic ignition please help 😫

[@tommiesmith3369]

You need to know what Distributor you have .. not the motor size or car it is in

[@scottpella7419]

I have seen SO many Pertronix failures. It's the same everytime...it gets them home, next day ...go to start the vehicle. And nothing. If you're going to run these electronic ignitions....just carry a loaded/ timed point distributor with you. Because eventually, you're gonna need it!

[@tommiesmith3369]

Are you running an Alternator or Generator?

[@scottpella7419]

@@tommiesmith3369 Hey Tommie! I always run points distributors on my personal cars. The failures have been on friends cars, both generator (12v) and Alternator cars.

[@tommiesmith3369]

@@scottpella7419 I ask because Generators can be more problematic as a whole with voltage/amperage spikes that don't play well with the Electronic ignitions. Just something I see often on that scenario.

[@scottpella7419]

@@tommiesmith3369 That makes complete sense! Sounds like you guys have some good road trips coming up soon. I'll be interested to hear how the ignition upgrade is holding up over time (and rough roads).

[@andrigtmiller]

I only wish that aftermarket electrical parts for VW's would use the VW color codes. Black instead of red for positive, and brown instead of black for ground. I get confused between the VW color code and the GM color code, which is what these parts are following.

[@vw_beetle_dave]

im running accuspark on my bug and runs great point are not as good as they was

[@VWLifeVW]

ah okay cool

[@LiltruckerDarkspear]

great vid - saving up one for my 69 beetle!!

[@VWLifeVW]

Right on!

[@rehform]

This is the first thing i always do when setting up a classic engine, ditch the points.

[@VWLifeVW]

cool