Jeep Cherokee Overheating Tips & Tricks

[@Cherokee98]

Thee best Coolant system video on KZbin for a Cherokee , you are spot on with everything you’ve done , and everything you’ve done I’ve been running on my 94 for over 10 yrs with great results my Cherokee also will not run over 180 in hundred degree plus heat….Great video Thanks for sharing this knowledge…

[@mrebysan]

Holy goodness! Thats a lot of wiring and mods! Sweet hood.

[@fabguy276]

Thanks. I literally have 8 relays on the Jeep and 12 switches.-lol. I should probably put a bigger alternator on it one of these days too…

[@DustySteel]

I really like the drift style radiator sprayers!!👍

[@austinthomas3689]

Very nice content here man! I’ve not seen or heard of some of your modifications you’ve shown. I will be putting some of these mods into my xj soon. it struggles with the heat here in Florida

[@RavenRedwood]

Sorry man I know it's been argued to hell and back but regarding the thermostat, it's nothing to do with emissions. It's set to 210 because the engine tolerances are machined to account for that exact thermal expansion so when you run at lower than operating temp there will be more wear. More scoring, more knock, more piston slap which the 4.0 definitely doesn't need, etc. Regardless of when the tstat opens, overheating is indicative of a greater problem. Mine is stock 210 and has no problem cooling once the system is open, even in hot weather. I only have vents because the bay gets stupid hot, enough to damage the injectors. (A heat shroud under the fuel rail helps a lot with keeping it from boiling over too). Either way the 4.0 is one tough cookie and a long as your oil is reaching the proper viscosity she'll truck on regardless. 👍

[@fabguy276]

I’ve never heard that information before and it makes a lot of sense. I’ll try to throw in a 195* with weep holes next time I swap it out. What size tires are you running?

[@RavenRedwood]

@Fab Guy just 31x10.5, I haven't put a weep hole in mine but here's a relevant forum post: "You only want one small hole, otherwise your engine may pass enough coolant to not come up to operating temp in the winter. You would then have issues with low heat output in the heater and rich mixture when in stop and go traffic. The hole should be 1/16" or smaller."

[@user-to6jg3ts9f]

@@fabguy276 In an open system, the weep holes aren't super important. It'll bleed itself after a few cycles no matter what.

[@v12alpine]

ZJ clutch works with the mishimoto just need to adjust the top radiator mount a little. Also helps if you have poly trans mount so the whole unit doesn't move front to back. Agree on the power loss but it's not significant, and makes a big diff at low speeds. It's a good tradeoff, no longer need full electric for crawling and no more high speed heat like I had with full electric.

[@fabguy276]

Maybe I’ll buy another model to try. I had a Napa one that I got part numbers off the Naxja forum and their was no way it would fit. I have poly motor mounts and the ZJ fan clutch would not fit at all. Negative clearance. Maybe a different brand ZJ clutch fan would be smaller…🤔

[@luketomal5185]

@@fabguy276 get spal fans or ford tauras fans

[@JMU_664]

Awesome Video , im also doing simuler mods to my Jeep TJ

[@E.force89]

Solid video dude, keep them coming

[@motownXJdad9565]

i basically have the same cooling mods except i have a stock style new rad. and a external plate style trans cooler with a 180° stant Tstat with the drilled weephole, and i also run waterwetter in the summer. same thing it all works great, no issues with the ecu, running rich etc. the Dorks on the interwebs freak out every time i list my cooling mods, its hilarious. theyd rather run hot on the edge of overheating because thats the way the factory did it, stupid. great vid, hope people learn from it, and you got a new subscriber👍

[@v12alpine]

Same. It's nice having the extra head room starting a grade or crawl session at 180 vs 215. Sprayers are dope though, havent needed them yet fortunately.

[@fabguy276]

Thanks. I totally agree with you. They say they run rich but I’ve never seen anybody test or post their AFR number change from a 180 t stat. What ambient temps does your Jeep see? I run this pig in 107f in the summer! I’ve noticed it runs waaay cooler in the 90’s. 100* plus temps are no joke. Everyone says the stock setup is the best. Sure it works with stock wheels and tires, no armor etc, but not with 35’s gear and hot SoCal weather.

[@fabguy276]

The sprayers work for grades but at the end of the day are just a band aid.

[@jasons3721]

@@fabguy276 awesome your in So. Cal, so I take it the 180 tstat doesn't give you any issues when you got to smog?

[@fabguy276]

@@jasons3721 fortunately it does not. I was a little though worried this last time because the weather was cold and the Jeep wouldn’t get over 185f. So I tried to get it hotter by idling for a while to no avail. Nevertheless she passed smog flying colors at a legit shop not too long ago and SoCal has really difficult smog laws.

[@NoName-yl3pb]

After getting sick of flushing my 99 xj cooling system constantly I made some modifications. I did the mishimoto radiator and electric fan. Hesco high flow thermostat housing and water pump. 180 thermostat. Here in UT the temps can fluctuate from as low as 15-20 degrees to 105-110. The fan controller on the mishimoto radiator lets me dial in when it kicks on in winter (higher temps) and summer (lower temps). Im usually fluctuating between 190-210 and never getting above 215 or so

[@fabguy276]

Can you run your AC and not overheat in summer temps?

[@NoName-yl3pb]

@@fabguy276 In normal traffic conditions yes. I haven't taken it to the trail yet during 100+ conditions

[@billmatson8711]

I run a 180° thermostat No codes . Too hot in Florida.

[@caseyhadland2273]

Love your ideas man! Where/how did you mount your sensor for your aftermarket temp gauge?

[@fabguy276]

I installed it in line with the hot side of the heater hose connected to the thermostat housing

[@ahmadkamali8547]

Exlent modification

[@jammerlupardi8782]

The engine was meant to operate at 195-205 degrees for performance……altering that you are losing horsepower….

[@fabguy276]

@@jammerlupardi8782 have you Dyno tested this theory of yours? In my experience, lowering the air intake temperature will give you more horsepower. You don’t want the Jeep to run too cool but if you took your jeep for a spin at night when it was 40° outside, I guarantee you it would be five times faster than during the day at 110°F, Fahrenheit.

[@jammerlupardi8782]

@@fabguy276 we all know that colder air is more dense that hotter air ….more air = more hp

[@officialWWM]

Love the spray nozzles on the radiator. Do you think they actually help?

[@fabguy276]

It will drop the engine temp about 5-7degrees F, but only for about 5 minutes. It helps me when I drive up steep grades in the summertime.

[@officialWWM]

@@fabguy276 that still sounds like it’s worth the effort. I was out on the trail yesterday. The temp was 34c and I had a long slow crawl up a steep, rocky hill. My cooling system didn’t like it so I’m on the hunt for solutions, lol

[@fabguy276]

@@officialWWM I wonder how hot your trans temp was??? I noticed that high trans temps also effect the engine temperature. It makes it difficult for the engine temps to drop unless you pull over and let it cool down..

[@fabguy276]

Knowing what I know now, probably 250 Fahrenheit. I also agree on sometimes you just have to pull over, especially after going up a steep grade. Even opening the hood can be necessary as well.

[@officialWWM]

@@fabguy276 thanks for the update. Maybe I should try a trans cooker upgrade?

[@Prerunner_xj]

How much additional vibes do those motor mounts produce and do you also have a trans mount? My trans and motor move around way too much. Thanks!

[@fabguy276]

I have SFR mounts on the motor and trans. Not too bad but sometimes at a stop light I’ll feel it but it doesn’t bother me at all. The SFR bushings have a unique durometer rating and I suspect they are softer than other ones out there. Super happy with them! BtW… you should post more vids on your Jeep.

[@DustySteel]

I should’ve started with this video lol.

[@Humorem15]

Did you plump your trans cooler in series or bypass the radiator?

[@fabguy276]

Radiator is bypassed because I don’t want my trans temps to be 210f or higher. Both tranny coolers are in series. One has a fan on it. It would be good for cold weather though. E.G. in the winter my trans sits at 109f on the freeway: a lil too cold.

[@moejr14]

Bro can you post the link for that windchill wiper washer reservoir and motor?

[@fabguy276]

Amazon link is no longer available. Look for a universal windshield washer kit. $20-40

[@moejr14]

@@fabguy276 thank uou

[@BUKWulfSh0t]

I have a 97 xj about to change the water pump and* thermostat but i was told to go with a 195. My jeep is stock. no mods Any tips on which 1 to get?

[@fabguy276]

It depends which climate you live in. If you run in 100 temps I would run a 180, if not run a 195

[@BUKWulfSh0t]

@@fabguy276 im in California

[@BUKWulfSh0t]

@@fabguy276 thanks for the reply

[@fabguy276]

@@BUKWulfSh0t SoCal?

[@BUKWulfSh0t]

@@fabguy276 yes

[@MrJoey1570]

A 180 stat tripped my ck engine light put the 195 back

[@fabguy276]

That stinks. What year is your Jeep?

[@v12alpine]

@@fabguy276 I've ran 180 for a couple years no engine light 1996. It never drops below 175' which I think is the set point for the code.

[@fabguy276]

@@v12alpine I’ve even had my Jeep even run at 170 while coasting downhill for 10 minutes and it still never tripped a code. Good to know, thanks.

[@MrJoey1570]

@@fabguy276 2001 I've done many mods on it to keep temps down many you have done I think the best is likely the timed relay on the electric fan having control over that fan while running and the cool down option after turning the Jeep off is really helpful

[@pinkdolphintk]

Is that the flow cooler water pump? I’ve been looking for a hesco pump but can’t seem to find it

[@fabguy276]

I have the Hesco because it is better than the flowcooler. Check the Hesco website

[@fabguy276]

hesco.us/products/30803/high-flow-water-pumps/45086/1987-2001-jeep-cherokee-and-comanche-high-flow-water-pump-hf58-455#.YWpSpcBlAWM

[@Cherokee98]

@@fabguy276 Why is the Hesco water pump better then the Flow cool ? I have a Hesco high flow water and just got the flow cool one for another Cherokee I have….. Great video lots of really good tips !

[@pinkdolphintk]

@@fabguy276 Thank you !

[@fabguy276]

@@Cherokee98 the impeller is billet in the Hesco which is higher quality than the flow cooler.

[@moejr14]

Does running a 180° thermostat affect your fuel economy? I’ve always heard that if you run improper thermostats that the engine uses more fuel to get to temp.

[@fabguy276]

In winter time, yes gas mileage suffers a bit. I only notice worse mileage if it runs cooler than 195 which is only in 50 * ambient temps.

[@user-to6jg3ts9f]

Correct. Running 180* thermostat may prevent your engine from reaching the correct temperature for which it was designed to run. The wrong thermostat causes the engine to stay permanently in "warm up" mode. In order to warm itself up to 195*, the ECU will continuously dump extra fuel into the cylinders. This will cause you to be constantly wasting fuel, and may also cause damage your vehicle. Additionally, Once the engine is at or above its proper operating temp, a 180* thermostat will not provide any greater volume of coolant flow than the OEM thermostat.

[@Mojorisin1293]

You cannot find that damn hesco thermostat housing anywhere it’s infuriating

[@fabguy276]

Did you try their website?

[@Mojorisin1293]

@@fabguy276 yeah it allows you to order but says it’s on back order with no timetable for arrival

[@fabguy276]

@@Mojorisin1293 you can always port out the stock one