05 JGC Overheat Issues - JeepForum.com

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post #1 of 6 Old 06-19-2013, 08:02 AM Thread Starter
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05 JGC Overheat Issues

So I own an 05 Jeep Grand Cherokee 4WD 3.7. I have had an overheat problem that is killing me. I will drive down the road around 60 MPH and have no problems but when I'm going less than 45 MPH and stopped it begins to overheat. Once I get my speed up again it begins to cool down to the recommended temp. I've replaced both fan relays and the thermostat. This morning it did it again but it actually completely overheated and said check gauges. I pulled over and shut the car off. I then turned the key to the on position and it just flashed between transmission over temp and check gauges. I believe the transmission over temp message is just a stupid default msg but I put a quart of ATF+4 in anyway just to see and it still overheats. My next step is replacing the water pump and hoping it will solve my problem. Does anybody have any better ideas?

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post #2 of 6 Old 06-19-2013, 12:21 PM
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Are the fans coming on? It seems like there is enough airflow through the radiator to keep cool when your crusing at 60.


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post #3 of 6 Old 06-19-2013, 05:06 PM Thread Starter
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Yeah, the fan kicks on hi and lo when at a stop. It still overheats though. I believe the transmission is actually overheating. I just put a new water pump in and it's still doing it but worse.
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post #4 of 6 Old 06-19-2013, 09:54 PM Thread Starter
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Overheat With Vapor lock

My 05 JGC is overheating due to a vapor lock in the coolant system. Does anyone know a good way to get the air out of the system?
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post #5 of 6 Old 06-24-2013, 12:51 PM
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Pull the plug from the top rad hose at the engine (should be a 1/2" plug that can be removed with a 1/2" ratchet). Fill from there with the motor running with the heater on. continue adding until coolant until the air bubbles stop. This can take 15mins or so with the motor running. Have a look on youtube for instructional videos. I've seen a good one for 3.7L in the Liberty
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post #6 of 6 Old 06-24-2013, 01:04 PM Thread Starter
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So i did fix it this previous friday. I let the engine cool and took the top hose off the block side and filled it there. Then started and got the thermostat to open finally and bled the system. Thanks for all the advice.
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