Question about 2001 Jeep Grand Cherokee
If you have a high mileage vehicle, or you have purchased this Jeep second hand, it could be a clogged cooler that is causing the overheating issue. How did the fluid look when it was drained?
Pull the lines off at the transmission and at the cooler. Use compressed air with a rubber tip to blow out the cooler lines. If the lines are not clogged up, then focus on the cooler itself. If it is the original cooler the factory installed, it may need to be replaced just based on age. Hot and cold temps will cause ANY material to fatigue.
Is the cooler clean (no debris between the fins or behind the cooler)? If you live in a dusty environment, this could cause enough heat build up.
To increase the cooling efficiency, you can move up a size on the cooler and you can use some spacers to increase the gap between the back of the cooler and what ever it is mounted next to. More air behind it will help it cool a little better.
Since it is a Jeep, if you have off road lights or a winch mounted in front of the cooler, you may want to consider mounting it someplace else to maximize the air flow it receives.
Other than cooler woes, I don't have many more guesses. If it were electronic you may or may not be getting a Check Engine Light. Might want to call a local dealership or a transmission shop to see if they have seen anything like this before.
Posted on Jan 07, 2018
SOURCE: Service 4 wheel drive
The service 4 wheel drive light comes on because there's a problem. The biggest causes of this I've seen are a software glitch in the final drive control module which the dealer can fix by reprogramming and the other is usually the electric actuator on the front axle housing. The only light that comes on by a timer is the one that says, "perform service" in your overhead console or odometer.
Posted on Apr 15, 2009
you need to tighten those fittings with a wrench... if they still leak... remove them and wrap them with a couple turns of "teflon tape" the kind they use for plumbing. the clamps you should use are hose clamps of the same type that you use for radiator hoses... you will note these can be tightened with a socket.... you really don't need to over tighten them but fairly snug... transmission fluid has quite alot of pressure.
Posted on Apr 19, 2009
I can't answer all your questions, but the lower trans cooler line is vital in keeping the transmission fluid temperature not to overheat which will burn up the transmission if left ignored.
Limited slip is the rear differential and how it works (the tube in between the rear wheels with a large round thing in the middle) During normal driving the right rear wheel is the prominent wheel that allows your vehicle to go forward, in slippery conditions if that wheel starts to spin clutches on the inside of the rear differential will allow the left rear wheel to also start to spin so both rear wheels now are turning which helps getting your car out of that slippery condition. (in theory)
Posted on Oct 13, 2009
Testimonial: "very helpful"
may have a bad temp sensor for trany oil, or the cooler or lines may be restricked,the oil temp has to be checked when the light comes on, this will tell if its really hot or the sensor is bad, start there.
Posted on Jan 03, 2010
Testimonial: "Thanks, for your take; it definitely sounds very possible thats its a bad sensor, oil appears to be ok and all fluids are ok too, bringing it in"
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