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Random high coolant temps

KnightJLU

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So my 2.0T has ran fine until recently. Had the water pump replaced at the dealership under warranty and thought that was a source of an overheating problem. The thermostat is also fairly new.

If I give it a little beans, and sometimes under normal acceleration, my temps will reach near 230 and takes longer than normal to come back down. Even then, it’ll stay around 210-214 then randomly the fan will decide to kick into high gear and drop it back to 190-195. To me it feels like the fan isn’t kicking into jet engine mode nearly as much as it used to.

Puzzled as to what it can be. I’m thinking a temp sensor or something related to that.




 

Mudduck

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My 3.6 Auto does the same thing. I think there some wonky shit in the tuning since the fans are computer controlled now.
 
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KnightJLU

KnightJLU

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My 3.6 Auto does the same thing. I think there some wonky shit in the tuning since the fans are computer controlled now.
I was thinking that. It’s almost as if the fan is confused on whether to kick on at ~210 or at ~230
 

Mudduck

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I was thinking that. It’s almost as if the fan is confused on whether to kick on at ~210 or at ~230
It seems completely random. But if you turn the HVAC control to high, the fans seem to kick on. what's even more neat o, is the gauge reads the same at 195 as it does at 230. Haven't figured that one out yet either.
 
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KnightJLU

KnightJLU

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It seems completely random. But if you turn the HVAC control to high, the fans seem to kick on. what's even more neat o, is the gauge reads the same at 195 as it does at 230. Haven't figured that one out yet either.
Weird. I’m gonna try to get it hot and use a thermal reader on the temp gauge areas and see if they’re reading properly. Something’s wrong here.
 

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Was about to make my own post but I’ll post here… my I’ve had mine for 6 days, used bought at 7100 miles. Yesterday my fan was on full blast for all of my driving, today it was the same but my coolant temp would go way high (talking 252 when idle) give me the warning, and then it would drop back down to 240, 230 and it would sit there then jump right back up. I feel like it’s a temp sensor issue… thoughts? I’m new to Jeep and am not exactly a mechanic so open to suggestions. Trying to get it in to see the dealership ASAP. For reference I’m in AZ, and average temp today was high 80s
 

Mudduck

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Was about to make my own post but I’ll post here… my I’ve had mine for 6 days, used bought at 7100 miles. Yesterday my fan was on full blast for all of my driving, today it was the same but my coolant temp would go way high (talking 252 when idle) give me the warning, and then it would drop back down to 240, 230 and it would sit there then jump right back up. I feel like it’s a temp sensor issue… thoughts? I’m new to Jeep and am not exactly a mechanic so open to suggestions. Trying to get it in to see the dealership ASAP. For reference I’m in AZ, and average temp today was high 80s
Mine has never gave me a warning. Im thinking of mounting a pusher on the front of the condenser. Haven’t done much research yet, but im thinking it wouldn’t hurt. Seems like the cooling in JL is inadequate.
 

XxsullyxX123

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Was about to make my own post but I’ll post here… my I’ve had mine for 6 days, used bought at 7100 miles. Yesterday my fan was on full blast for all of my driving, today it was the same but my coolant temp would go way high (talking 252 when idle) give me the warning, and then it would drop back down to 240, 230 and it would sit there then jump right back up. I feel like it’s a temp sensor issue… thoughts? I’m new to Jeep and am not exactly a mechanic so open to suggestions. Trying to get it in to see the dealership ASAP. For reference I’m in AZ, and average temp today was high 80s
this is not normal...someone traded a jeep in with issues and they flipped it to you...get it taken care of
 

JamieIvester

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I was having the same issues, and realized I was checking the turbo coolant reservoir. When I realized the black tank on the firewall was the radiator reservoir, I also realized I was low on coolant. I hadn’t seen any puddles or indications of a leak, but at idle this winter I have had a couple times the temp got abnormally high. Well, today when I was adding coolant, I also realized that reservoir has a leak somewhere on the bottom and the leaked coolant must have been hitting the turbo and vaporizing. Adding the coolant definitely solves the high Temo problems and I have a new reservoir on the way. Glad I figured out the cause to the high temps and then why the coolant was low. Pretty easy fix it appears.
 

Medsker

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Glad you figured it out. I checked mine out pretty thoroughly but will have to check that area better. It hasn't gotten hot for a while. Mainly because I haven't been driving it at high speeds up steep hills lately. Good luck with your fix!
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