Here’s Why Your Car Windows Fog Up and How to Stop It Permanently

[@scottykilmer]

China is About to Buy These Car Brands and Shut Them Down: kzbin.info/www/bejne/kH_df4eBadd8m5o Thanks for Watching! Subscribe and hit the notification bell for new vids daily: kzbin.info/door/uxpxCCevIlF-k-K5YU8XPA ⬇️Scotty’s Top DIY Tools and Products: ►Best Scan Tools: 1. Bluetooth Scan Tool: amzn.to/2nfvmaD 2. Cheap Scan Tool: amzn.to/2D8Tvae 3. Mid-Grade Scan Tool: amzn.to/4bLkN2g 4. Professional Scan Tool: amzn.to/4dsaa6e ►Best Car Jump Starters: 1. No Charging Required Jump Starter: amzn.to/3i7SH5D 2. Mid-Grade Jump Starter: amzn.to/2nrc6qR 3. Best Jump Starter: amzn.to/4c1O9JI ►Best Fluids for Your Car: 1. AT-205 Re-Seal (Can Stop Leaks in Your Engine, Transmission, Etc): amzn.to/3LCruJq 2. ATS 505 Fuel System Treatment (Pour in Gas Tank): amzn.to/3LXhEC9 3. ATS 505 Oil System Treatment (Pour in Engine Oil): amzn.to/3SZHZmN 4. Head Gasket Leak Test Kit (To See if Your Car Has a Blown Head Gasket): amzn.to/3yDmj9h 5. Lubegard Automatic Transmission Shudder Fix: amzn.to/46XEsek 6. Lucas Oil Transmission Fix (For Worn / Slipping Transmission): amzn.to/3WSBgfK 7. Meguiar's Headlight Coating (Keeps Your Headlights from Fading): amzn.to/46l7kgh 8. Meguiar's Headlight Restoration Kit (Restores Faded Headlights): amzn.to/3zT9ojN 9. Meguiar's Clear Plastic Cleaner and Polish (Cleans Headlights): amzn.to/4cY7RYc 10. Meguiar's Car Scratch Remover: amzn.to/4faB3wJ 11. NuFinish Car Polish (Use on Paint or to Stop Windshield Squeaks): amzn.to/3SjmYmA 12. Invisible Glass Cleaner (Inside/Outside Car Window Cleaning): amzn.to/3YcElcL 13. Hide Rehab Leather Conditioner (For Leather Car Seats, Etc): amzn.to/3YYVtmN 14. Blaster Silicone Lubricant (Lubricates power windows, door hinges, stops squeaks, etc): amzn.to/46Ss3bP 15. Rain-X Waterless Car Wash: amzn.to/4czhc7K 16. Permatex Windshield Repair Kit: amzn.to/4fX5mHF 17. CRC Battery Terminal Protector (Stops Battery Terminal Corrosion): amzn.to/4dNnIsy 18. CRC Mass Air Flow Sensor Cleaner: amzn.to/3YSTm3x 19. Bar's Cooling System Stop Leak (Can Stop Small Coolant Leaks): amzn.to/4dQM3Oh 20. Bar's Blown Head Gasket Repair (Can Stop Head Gasket Leaks): amzn.to/3AH6wXj ►Best Car Accessories: 1. Quick Twist Oil Drain Valve (For Fast and Easy Engine Oil Changes): amzn.to/46Vn2z4 2. Solar Car Battery Charger: amzn.to/4fktsMd 3. Plug-in Car Battery Charger: amzn.to/3Yqpjju 4. Dash Cam (Every Car Should Have One): amzn.to/2YQW36t 5. Key Finder (To Find Lost Car Keys): amzn.to/3Yb6gd4 6. Faraday Box for Car Keys (Blocks Car Key Signals / Anti-Theft): amzn.to/3YPlCnX 7. Tire Gauge (To Check Tire Pressure): amzn.to/3y8R4CE 8. Tire Air Pump: amzn.to/3yCqiD3 9. Car Memory Saver (Use When Changing Your Car's Battery): amzn.to/3YmWQeJ 10. Car Odor Eliminating Rocks (Removes Smells in Your Car): amzn.to/3zYMFCP ►Best Tools for Working on Your Car: 1. Best Cheap Magnetic Work Light: amzn.to/4dQKL5T 2. Best Small Flashlight: amzn.to/4fePFep 3. Best Expensive Multi-Use Flashlight: amzn.to/3WBxzft 4. Car Battery Tester: amzn.to/3SXean1 5. Basic Mechanic Tool Set: amzn.to/2tEr6Ce 6. Professional Tool Set: amzn.to/2Bzmccg 7. Ratcheting Wrench Set: amzn.to/2BQjj8A 8. Crowfoot Wrench Set: amzn.to/3Xcn6aB 9. Cordless Impact Wrench: amzn.to/3WHgpMa 10. Corded Impact Wrench: amzn.to/4bVrHlG 11. Electrical Circuit Probe (For Testing Power, Ground, and Shorts): amzn.to/4cTwMfp 12. Socket Extension Bar: amzn.to/4dedEsf 13. Small Sledge Hammer: amzn.to/3WzHsdj 14. Best Borescope for Seeing in Tight Spots: amzn.to/3zW3U7K 🛠Check out the other tools I use and highly recommend ► goo.gl/rwYt2y 🔥Scotty Shirts and Merch ► goo.gl/pTAeca 👉Subscribe and hit the notification bell! ► goo.gl/CFismN As an Amazon Associate I earn from qualifying purchases.

[@Oh-That-Guy-Again]

I don't have ac in my old car. In the summer it is sometimes hard if it is above 90. I often don't drive at all. (Maybe in the early morning or late at night.)

[@MiguchaDonovanRicarardoMigucha]

👍​@@Oh-That-Guy-Again

[@fiddlejohn9305]

Back in the days before air conditioning most cars had front vent windows. You could open those up and angle them to blow the condensation off the inside of the windshield. Worked like a charm!

[@DBEdwards]

Just an aside. I asked you to review the 2017 Jeep Patriot I owned. You graciously did. You were critical, OK, but honest. That is a favor I thank you for and remember always. Real gentleman you are. One in a million you are on the net

[@PatrickMersinger]

There was a time when “fogging up the windows” was a fun thing. Lol If you know…you know. And probably smile too.

[@ravenmoto5948]

Still is 🤣

[@petesevern7638]

​@@ravenmoto5948, my sentiments exactly. 🤘🔥🤘

[@greathey1234]

10:35 Scotty knows

[@Douglassantos-m6v]

😂😂😂😂😂😂

[@vincentdecicco7102]

Your exacty right. This was one of mine. I took my future wife to the drive in named Sky High Drive in located in Lombard, Illinois in 1980 or 1981 or 1982. The movie was 9 to 5. We never saw the movie.

[@sesimie]

My job as a kid in the 80's was to de fog all the windows and windscreen in the humid rainey weather here in the Caribbean. I remember when we finally got AC in a car i was so happy!

[@danf321]

EASY solution: Turn on the A/C with the temp setting up to warm. The A/C evaporation works great.

[@nthgth]

That's what the defogger setting does, he went over that in the video

[@devarmont87]

Doesn't matter if the AC is set to warm or cold.. I have proven this in all 4 of cars in the past, as long as you have the actual AC on.. not just air flow. The temp is only relevant if you're doing it in winter ... But as I said, both temps will work.

[@Dpixtion]

@@nthgthyes, AND, you run the A/C on hot & recycling air with the vent for feet and vents set to chest, none of the car will fog…. Drys out the car..

[@JSDudeca]

My best trick is to squeegee the inside of the windows from time to time. There is a buildup of oils over time on the inside of windows that makes fogging much worse. It may look weird at the gas station but it works!

[@mcelfreshiii]

I do that too. I don't know why it works so well. Magic fluid.

[@JSDudeca]

@@mcelfreshiii When you clean the squeegee, I'm always surprised with the gunk that comes off

[@Oh-That-Guy-Again]

Use some Windex (glass cleaner) and a clean tea towel.

[@JSDudeca]

@@Oh-That-Guy-Again I've tried that but you would be surprised on how effective windshield wiper solution and a squeegee is. Would be interesting to do a test.

[@MrOiram46]

You can buy your own squeegee too and do it at your convenience.

[@nthgth]

They call it "air conditioning" instead of "cooling" because it was originally invented as a way to control humidity. So it makes sense to have it on when you're trying to do exactly that.

[@banjomechanic]

Scotty is the best thing since Car Talk.

[@clarencewiles963]

I never see inside fog. I run my AC year round. 😂 thanks Mr Kilmer you’re spot on.

[@DamienVannest]

I’m always blown away by how simple you make things!

[@almostontimehero5415]

Scotty gives the best advice.

[@D1NKERR]

Hey Scotty! Thanks for clearing that up for me. 41 years old and I had no idea the A/C comes on when I have the defrost crankin. I guess that means I'm getting worse gas mileage

[@vikingsoftpaw]

A trick that works for me is removing and drying the floor mats. Major source of winter moisture.

[@brushstroke3733]

Good tip, thanks!

[@otablott7779]

Use Rain-X anti-fog wipes and a little buff off with a microfibre cloth. This works 100% and lasts.

[@KayGx]

on the inside or outside or both?

[@PennySue]

​@@KayGx interior

[@Mithrandir6622]

For the exterior I use defroster spray

[@willie123811]

Is it tint safe?

[@OG-Silesian]

@@willie123811 I think it is, the chemicals of antifog shouldn't be that toxic to degrade foil. i have all windows tinted (legally ofc😂) and as long as the cloth i use is clean of debris its good. It works on safety glasses too so your breath don't fog up your goggles+mask combo.

[@joeturner4666]

My Old Ford Pick Up 30min to change a heater core, My Neighbors old Dodge we had to remove the entire dash, and then wait weeks for parts that we broke while doing it.

[@smailabbad3718]

Even thought i can not understand english well but i love this channel

[@DBEdwards]

Watch Scotty and learn English

[@williamwilson6499]

Chuck Yeager had a problem with his Bell X-1 windshield fogging up and freezing. I forget the name of his engineer, but he cured the problem with Joy dish soap.

[@LifeRx-b4z]

My Toyota Matrix the previous owner had not changed the coolant in the car ever. I had so many issues until I did 2 of the prestone anti-freeze system flushes, saved my car. I also did a motor medic engine oil flush. I realize that's not something to do a lot but it can help if your car wasn't ever maintained.

[@Taz68]

I ❤ ur videos Scotty. Please keep thm coming. As a woman, I try 2 fix wht I can. I've had a few times places try 2 pull 1 over on me cause I'm a woman. I started going 2 Pick a Part whn I was younger. Thts how I learned. Anyways, thank u again.

[@JustAverageJeff]

I spent 2 summers in Vegas without AC in a 2001 4 door blazer with only single climate control in the front and the compressor went out was $1,600 for a new one not including labor to install and we ended up selling it for $600 they drove it 2 weeks before it blew up. My mom was on disability and we just couldn't afford to maintain it and she never told me how much maintenance it needed beyond oil changes and I did that, but I didn't know there was more than that until I bought my own vehicle several years later. I wouldn't recommend driving without AC to anyone unless you live in a place like California. I dreaded having to go anywhere at anytime except the winter because the heater worked but it would feel like you were melting anytime you had to stop at a light and while you were moving it just felt like a hot blow drier it was awful I will never buy a vehicle without working AC because of that experience.

[@KayGx]

52 degrees here this morning in NW. FLorida panhandle...thanks Scotty will check our 2012 lexus and 2003 4runners log book.

[@DoctorReto]

Another trick you can do if your windows are fogging up is you take an old sock, fill it up with cat litter ,seal it with a duct tape or something like that and just throw it under a seat or on a dash if you don't mind looking at it and people asking questions. It will slowly absorb excess humidity in your car and prevent the condensation on your windows so they will stop fogging up. 👍

[@fdavidharrisson5023]

I miss wing windows. They were great for defogging windows.

[@darrensoldan5972]

Love a good fog up back when they made bench seats 😎

[@JoeSlish-q2e]

a headline that actually describes the video be still my beating heart

[@RubeDawg81]

This guy is my favorite KZbin mechanic!

[@jennifertiemann6403]

Thank you for this information!🙏 Your energy is awesome! 😃

[@gerrywalsh5766]

Heat pumps are actually quite simple... The complicated part is the reversing valve that reverses the refrigerant flow through the internal and external sets of coils. In heat mode you are actually cooling the outside air... Lol

[@redmed10]

Refrigerator and heat pumps work just like magic to me. Just like vaccum flasks that keep cool drinks cool and jot drinks hot - how do they know?

[@jimmynickels6248]

Always a pleasure Scotty!

[@SmithMediaOutdoors]

Nice subtle dig at Chrysler Scotty.

[@Allen-w9d]

One thing I found out a few years ago is that if the control is set to recirculate the air, all of the windows except the windshield and part of the front side windows will be the only ones that do not fog up. That is because the moisture in your breath will be trapped inside the car and all the windows the defroster is not blowing directly on will condense your breath moisture on them. Once I figured that out and took the control off recirculate, the moisture was slowly blown out the exhaust vents and all of the other windows started to clear up.

[@oliversmith9200]

Wow... I shared this to my son, the owner of the car I drive. The A/C comes on with the heat/defroster. I thought it was a fault in my car's system. I always turn it right off. It just takes a little longer to clear the fog and I've got the old 100% cotton flannel shirt with the sleaves cut off right there to wipe a little if need be.

[@sunderjirahim]

The 2019 Camry has an electronically controlled thermostat. When I had my independent mechanic do a coolant flush, the OEM thermostat was approximately $100. He told me it was a complex system and not like the older regulator cooling systems.

[@julzb7165]

Hi Scotty, thanks for your daily amazing videos. Have a great day 😀

[@taras4952]

All newer vehicles have radiator overflow reservoirs which essentially manage the expansion and contraction of coolant. Won't keeping the correct level of coolant in the overflow reservoir avoid air getting into the cooling system and heater core?

[@modus_operandi2508]

Yes

[@ElizabethMoary]

*I'm glad you made this video,* it reminds me of my transformation from a nobody to good home, $89k biweekly and a good daughter full of love..

[@Rufus-t3n]

Please how ?

[@ElizabethMoary]

$356K monthly is something you should feel differently about....

[@AlexanderMerry-q7r]

Lovely! I enjoyed it like I enjoy a $100k monthly around the turn!!!

[@Rufus-t3n]

Can I reach her? please share don't want to remain out of ignorance.

[@ElizabethMoary]

There is her line!!!! under this comment!!!!👍🏻👍🏻👍🏻 combine the DIGITS 🔁

[@PANTYEATR1]

I have to replace the heater core in my 02 Dodge ram. I had a coolant leak somewhere in the back of the engine where i couldn't repair it. I guess i added too much black pepper to the cooling system and it blew the heater core. Now i have this wonderful job ahead of me😒

[@EasyE1669]

Foggy windows were usually followed by the sound of tapping on the window by a Police Officer who was "just checking" to make sure me and my girl were "ok". Ahhh, the good old days. 😏

[@usmc29er44]

Hahaha...Those were the days!

[@stephenmartini5890]

Scotty, when cleaning the windshield first, use ammonia/water mix or spray and use a course cloth to break the film then, use a good cleaner like Windex and balled-up b/w newspaper, rub vigorously. The oils in black ink will make the glass shine and foggy windshields are a thing of the past.

[@asmrl0ading]

Timely advice

[@PomazeBog1389]

Dealerships by me are refusing to do business with anyone named Scotty. Your last name doesn't even have to be Kilmer. If you're first name is Scotty, they call the cops on you.

[@bendmall4341]

For real? 😂

[@sandygunn8214]

😅😂 Seriously?

[@ginog5037]

Why, because their a Stealership stay away!

[@brenthayes1671]

😂😂😂

[@marcuspeters3894]

Thanks Scotty for the information

[@audreytempleton4415]

❤ what would we do without you Scottie...thank you

[@kevinparker8216]

How to remove key tumbler from2006 BMW 3 4:40 4:54

[@shajojojojo]

My 04 Vibe and the Mattix are even more alike than I thought!

[@nthgth]

They're the same car with different lights and badges lol

[@LPS-mh8kx]

I had a VW bug back in the day. I’m not sure why a German built car was built with the worst heating system in the world. It was barely functional in the CA desert but but, oh Lordy, taking on a trip to the mountains during winter meant not only foggy windows but completely frosted windows that the defroster never touched except for maybe a small circle. And don’t get me going on the wipers.

[@timebong8366]

My best trick is to get them little packages that you get in beef jerky's save about 30 of them put them in a used sock tie it up and put it on your dashboard

[@brushstroke3733]

You can also order new dessicant packs from the big river online retailer. They come in many sizes. Good idea in any case.

[@timebong8366]

@brushstroke3733 nice

[@wesbaumguardner8829]

I was hoping there would be some sort of coating that you could wipe on your windows to keep them from fogging forever.

[@mmmmmthai]

0:47 Something might be wrong with my heater because I don't have hot water blowing in my face when I turn my heater on 😂

[@shadowslayer19cg91]

Gotta replace your hot water pump in your a/c unit. It allows your face to be warm while driving by scolding it completely off. I'd take it in for a service.

[@garylee2976]

Scotty I love your information and content and it's free 😊.

[@GMoneySaver]

Genius, Scotty! 🤩 Love it! 🥰 Thanks for sharing!! 🙏

[@TheTowertime]

Hey Scotty, I know some folks full of hot air too. BWHAHAHAHA!

[@juliancerda2]

Hey Scottie love your videos!

[@scottykilmer]

Hello and thanks!

[@L0n3W0lfBl4ck]

Before watching, the fan speed is set too low. You need air movement to keep it clear. I see so many people crank the heat to max and the turn the fan all the way down, and wonder why it’s fogging up. Turn the fan up to half or higher and adjust the temp to whatever is comfortable, and split it to windshield and floor. You’ll stay comfy and the windows will stay clear. Edit: if you got too much moister in the cabin turn on you A/C it won’t cool if the temp is set to warm and it will help dry the air.

[@OG-Anetka]

Another issue, at least what happened with my Chevy Traverse... whomever designed the A/C line path, did a horrible job... since the A/C line rubbed against the heater line caused a hole in the A/C line. 😞

[@thearsenalmisfit2414]

Turn the recycle air switch off . Works 9 times out of 10 on the Prairies.

[@Zzrdemon6633]

When my f150 fan stopped working on the bottom 3 fan speeds, there was something behind the glove box I changed and got the full range back, can't remember what it was called but a google search saved me at least 125$ dealer visit

[@renkhachatoorian302]

Its important to maintain the car cooling system and the heater. If it has manual transmission, it is supposed to last forever.

[@billm3589]

QUESTION >>>Have an old pick up truck … the repair cost of replacing my heater core is over a THOUSAND dollars. I have AC that I never use & probably will never use CAN I CUT THE FREON LINES and HOOK up the water lines (AC located engine compartment) … CREATIVE THOUGHT this could be a VERY CHEAP ALTERNATIVE TO REPLACING THE HEATER CORE … What do you think Scotty??

[@JP-ei1hi]

Oh, you like winter? Come to North Dakota.

[@PHamster]

Scotty Heat Pumps aren’t that complex. Instead of the engine powering the AC compressor it’s a DC motor via the battery pack. During normal AC, it blows cold air inside (captures heat) and spits it out via the radiator. For heating, there’s a reversing valve and reverses the flow of refrigerant.

[@TimEric4d3d3d3]

Scotty fogged up many a backseat window back in the day

[@fokkerd3red618]

Never rule out the blend door actuator for any climate control issues in the cabin.

[@John-g6x1h]

I bought a used car, ran it over 150,000 miles, then the heater fan stopped working. Genius that I am not, I replaced the fan motor, which was stupidly glued in place, which made taking it out a lot harder. The new fan motor...didn't work. I finally traced the problem to the wiring. The previous owners had installed a remote start, then uninstalled it, and left a bare connection, which then corroded to a fuzzy green when it got wet. Doh!

[@NateSmith]

1:06 Heat pumps actually aren’t that complex. They’re the exact same as an air conditioner with a reversing valve so they can work backwards.

[@ScottLara]

Thanks Scotty!

[@buckbuck3236]

My thermostat housing has a bleeder valve upon the top of it to allow it to be cracked open & vent any air from the cooling system.

[@dewdew34]

I think moisture is getting into the dash sometimes from dry windshield seals.

[@johnmendiola6402]

Watching your videos from the island of Guam..🌴 love watching…

[@EQ_EnchantX]

FYI: Warm or HOT air holds much more moisture than cold air. So just heating the air up allows the windows to defog some.

[@TimothyWelty]

Had a 77 Power Wagon with a shot climate control. I bundled up and cracked a wing when driving in the winter.

[@dulynoted2427]

Test the coolant for voltage. Check. Where do you fill the turn signal fluid?

[@pccougar895]

I put rainX on the inside of my windshield so no moisture will condensate and or freeze.

[@joebruno2675]

1000s to replace a heater core or 50 for a cheap Chinese diesel heater. Just make sure you put the exhaust outside the car.

[@Dpowell28]

10:15 if you just want to skip to the answer.

[@MCTeck]

In So Cal Does Not Apply , Most of the time.

[@WildLilac01]

Scotty what about when it’s only on the passenger side? I’m going to go park on a hill first. 2015 F350 Gas

[@darrickbrisco5016]

I never knew dirty coolant conducts electricity

[@petesevern7638]

ANY aqueous (h20) solution conducts electricity, to some degree or another.

[@arrahslichenmyer4986]

I like when you ring that bell!

[@apacheturtleisland9462]

love you scotty

[@robertwikeljr-1522]

?? - Nisson Frontier with two zone cab temperature system - left side windshield defogger / defroster works fine, right side blows cold air and will not clear glass. System has two airflow diverter plates, left easy to get to ( have not heard of any problems ). Right is between housing and firewall (told have to remove dash to replace) right one seems to HABITUALLY FAIL. $ 1200.-- to replace a $18.-- part. ps always seems to fail throwing cold air, summer / winter it's stuck in one position.

[@danielgriffith8911]

Ok, in my 2007 Honda Fit, if your windshield is fogging up its because you have the re-circulation control set to re-cycled instead of fresh air.

[@chub4141]

Scott you forgot if you have a 160 thermostat cardboard on the front of the radiator will help warm it up

[@Snerdles]

Heatpumps... very complex stuff... Like a fridge with a reverse valve so instead of taking heat out of the box it woulld put it in. So complex.

[@antoines522]

Making 😂out ! Hahahaha, even Scotty did that toooo …😂. Steam’em Up

[@RickyG1953]

Scotty forgot to mention the possiblity of a problem in or with the controls of the air blender box.

[@brokeandbored85]

I live in FL but I still enjoyed this video. I miss the days of living in cold weather

[@KayGx]

I live in NW Florida panhandle...52 degrees this morning....colder come winter...this video is good for us.

[@nthgth]

​@@KayGx52, psh. My Subaru was originally a Florida car. Its first winter in NY the Florida windshield washer fluid froze solid 😄

[@ken2400]

Once had to change the heater core on a 85 Golf diesel Took many hours and a month or two later there was a recall. I did get the $$ back for the core since I bought it at the dealer. Fun stuff

[@surf6009]

A slip there Scotty, the hot water. Went back in time. Ha!

[@MJSE-of7gs]

My cars are always spotless on the inside and outside, the A/C is always on, I have never had a window fog up, ever!

[@WyndellEarles]

Great video! Love you’re rocking the denim jacket / gray hoodie combo! Taking me back to the 80’s!

[@ricardogarcia3820]

Thank you

[@thebeerinnandrewmckenna2655]

Im on the uk, on these cold autumn and will be winter nights, my windscreen fogs up, it no matter how much I use the wipers and clear inside, its like it has fog in the laminated glass, and takes ten minutes to clear, how can I prevent it to start with

[@nicholasselvaggi54]

08:08 "The most common problem if they don't blow..." 🤣🤨

[@cotyharris388]

Scotty, I'm scared to use my heater now knowing the hot water blows through the vents and in my face, I know what ya mean keep up the amazing content

[@rickywhisenhunt4582]

Is it hard on the AC when defrost turns it on just to defrost the windows and one changes the settings after the windows are clear and so the Ac is back off again? I mean running the AC for a minute or so and back off seems to be a bad idea. Some people seldom use the AC and I heard it should be ran from time to time even in winter because the Ac unit is self lubricating and so needs to be ran every so often for a few minutes. I've also heard not to run the AC until the car is fully warmed up for a few minutes but these new cars turn on the AC as soon as you use the defrost when needed. I heard that these new cars (heating and AC units) control the humidity in the car now too.

[@sellier-bellot22]

easy trick to follow like you said !!! LOL😄

[@HOESDONTMATTER]

How do I find out what coolant is in the car so I don't mix it?

[@jbm0866]

Mindblowing that a company as huge as Chrysler (or used to be) would miss something so simple on their heater cores.🙈

[@davebealer8806]

Scotty…what about reversing the water through the heater core at the firewall to blow that gunk out of the core? Worked on my 1966 Ford Fairlane back in college!

[@seanmcfadden6600]

I worked at a gas station after school and a mechanic showed me that trick. Did that to all my friends cars.