Engine overheat at idle - JeepForum.com
 
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post #1 of 6 Old 07-18-2015, 10:35 PM Thread Starter
lodgemt
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Engine overheat at idle

2007 wk 3.7 laredo, noticed recently at idle engine temp gauge rises (past -) popped the hood, radiator fan is not running. Obviously once I start driving air naturally flows over radiator so temp drops down.

Checked 50a fuse, good. Not sure how to check the hi/low relays but I went ahead and bought two new ones to replace and try that. Not sure if that is even it as there are no DCT codes showing up. Fan isn't seized (to my knowledge). Spins freely by hand. No idea how to test motor or other electrical connections, everything looks fine, no frayed/exposed wires.

I did replace the engine coolant sensor and did a flush in December after pulling up P0117, have been running fine since then. I've only noticed the rising temp at idle since May/June-ish due to the summer heat, or so I assume that is the reason.

If changing the relays doesn't fix it I'm not sure where to go from there.

Any help/direction is appreciated!

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post #2 of 6 Old 07-19-2015, 09:46 PM
n7vrz
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Replace the relay and let us know if the fan then works or not.
The next step in my opinion would be to test the fan itself.
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post #3 of 6 Old 07-21-2015, 04:33 PM Thread Starter
lodgemt
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New relays came (hi/low). Plugged them in, fan still not coming on. If I remember correctly the fan would run as soon as the engine would turn on. I popped the hood and let it run for about 3-4 minutes, fan never kicked on.

I thought about testing fan directly but have limited electrical knowledge and tools available. Definitely willing to learn so again any advice is appreciated!
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post #4 of 6 Old 07-22-2015, 10:08 AM
JKM
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Fan only runs when it reaches operating temperature, except if you have the AC on. Easy way to check if turn on AC to max and wait a couple of minutes to see if the fan comes on. If not, then possibly the fan is not working. Last test would be wire the fan directly to power to see if it runs
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post #5 of 6 Old 07-22-2015, 12:03 PM Thread Starter
lodgemt
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I'll check w/ the AC on and after I drive around to get it up to operating temperature and report back.

In the meantime, best way to wire power directly?
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post #6 of 6 Old 07-22-2015, 02:38 PM
n7vrz
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Quote:
Originally Posted by lodgemt View Post
In the meantime, best way to wire power directly?
Unplug the fan motor electrical connector and run wires direct to the battery. Only try this with a connector that has two wires.
If you try this with a three wire connector and get the wires to the battery connected to the wrong wires for the fan you could damage the fan motor.
If the fan operates direct connected to the battery, you probably have an open in the wire(s) since you've already replaced the relays.
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Tags
3.7l , fan inoperative , idle problems , over heating , radiator

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