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Discussion Starter #1
Anyone experiencing overheating problems? 2014 Jeep Cherokee Summit EcoDiesel has overheated twice in the past week. First time was while in some light moving traffic at about 25-30mph mostly uphill for about .5 mile with outside temp about 83 degrees. AC was on. No hauling other than wife and I. Quickly the coolant temp moved all the way up. Coolant level was full. Second event was today while in downtown city traffic for about 15-20 minutes. Outside temp was about 93 degrees. AC was turned off when temp gauge stated to rise, but before getting into red zone. Also, placed AT in neutral at stop lights. Coolant temp continued to rise to max, but cooled once traffic started moving about 30-35mph. Am on a trip so can't take the Jeep in to a dealer for about ten days. Comments?
 

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Did it go into the red or just shy of it? Some here including myself have experienced something similar while towing. The high outside temps and lack of airflow may do the same. I found manual shifting and using higher rpm's (around 3000) with light throttle inputs helps a lot (while towing).
 

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Did some trouble shooting today. In heavy traffic, heat gauge will go into red. Fan is not working. Need some help... My Jeep has no 60A Yellow fuse in F03 position as indicated in Owner's manual for radiator fan. However, that receptacle has only one prong, while fuse needs two, so suspect my Jeep does not require a fuse in F03. Also, not populated are fan high and low relays in positions K1 and K2. The fuse and relays are marked with an asterisk on the fuse box lid indicating these might not apply. Anyone know if my EcoDiesel should have these two relays and 60A fuse? Appreciate some help! Dealer can't take an appointment until next week.
 

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Can someone please open their JGC's engine compartment fuse box and let me know if there is a yellow 60a fuse in position F03 (F3)? And, the same for relays in positions K1 and K3? As mentioned earlier, mine are empty. Thanks in advance!!
 

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View attachment 97 Hope this helps. Note mine is a Canadian one.
Parry, Thanks much!!! Same as my Jeep. This helps me to be a bit more knowledgeable when I take it in to a dealer next week. Hope you enjoy a pleasant summer in AB. We always enjoy our RV trips thru your area to Banff and Jasper. Cheers!
 

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Snowbird, you may be on to something with the fuses. My fuse box shows F03 for the radiator fan, but also on the left of F03 shows a K1 for "low speed" fan and a K2 for high speed fan to the right of F03. None of these fuses are provided. I am very eager to see what your dealer has to say about the absence of these fuses!

Parry, Thanks much!!! Same as my Jeep. This helps me to be a bit more knowledgeable when I take it in to a dealer next week. Hope you enjoy a pleasant summer in AB. We always enjoy our RV trips thru your area to Banff and Jasper. Cheers![/QUO
 

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Update. Dealer service replaced failed fan motor. Life is good. JGC no longer overheats and AC works better, too.

emersonjeep, Those two relays and 60A fuse are for other models. Not for our JGC diesel models.
 

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We had a serious overheating problem on our drive home from the dealership. Engine might be fried. displayed coolant temp failure message followed by oil temp failure message total loss of power then a min later everything went back to normal, drove a couple more miles to get home and saw this when hood opened, note the fan is definitely on working harder than I've ever heard a fan work and coolant tank empty with liquid(coolant I think sprayed all over. They hauled it off to a dealership that might get a chance to look at it this week. Meanwhile my pregnant wife is stuck without a vehicle. AWESOME!
 

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We had a serious overheating problem on our drive home from the dealership. Engine might be fried. displayed coolant temp failure message followed by oil temp failure message total loss of power then a min later everything went back to normal, drove a couple more miles to get home and saw this when hood opened, note the fan is definitely on working harder than I've ever heard a fan work and coolant tank empty with liquid(coolant I think sprayed all over. They hauled it off to a dealership that might get a chance to look at it this week. Meanwhile my pregnant wife is stuck without a vehicle. AWESOME!
Did you keep driving it while overheated until you got home...?
 

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Discussion Starter #11
OP update. Cooling fan replaced July 2014 by dealer. August 2018 cooling fan stopped working. Engine overheatng in traffic. Dealer again claimed that cooling fan motor failed and replaced it. Less than two weeks later, cooling fan #3 failed.

Common element is that all three failures occurred when weather temps were 93 to 97 degrees (F). However, this time, before returning to the dealer, my Grand Cherokee was parked for about two days in an air conditioned garage (76 F). When the Jeep was started, the cooling fan was working again -- low and high speeds. So after not working for about ten days of driving, the cooling fan is now functioning perfectly.

Three cooling fans and, perhaps, a fourth in the near future, causes me to think the cooling fan motor (brushless motor which is associated with reliability) is not the problem, but it's more likely the cooling fan controller module (relay) or the PCM.

I recovered fan #2 from the dealer and hope to find a shop who can properly test the two 12v and PWM wires. I would not be surprised if the fan motor is ok.

Anyone have similar experiences with their ecodiesel cooling fan?
 

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My 2014 Jeep Grand Cherokee Diesel starting overheating yesterday. The coolant reservoir was low, so I put in a half gallon of coolant. Its been close to red or red several times since and I've put a total of 2 gallons of coolant in and the reservoir is low again this morning. Not sure if there were air packets that could explain the 2 gallons needed to fill, but I do not see any leaks. I started to smell coolant a few weeks ago, so I'm wondering if the pressure cap could be bad and I'm losing the coolant slowly. The motor runs, but I was only able to notice it when its very hot and the motor seems to be straining loud at high speed.
 
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