Question about 2001 Jeep Grand Cherokee

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Jeep drops out of over drive then trans over temp light comes on. serviced transmission, filter ,5 quarts of atf-4. added transmission fluid cooler takes longer but still drops out of o/d and still get over temp light .suspect trans lines may be partially blocked does anyone know of any internal problems

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  • 33 Answers

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

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Posted on Jan 02, 2017

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  • 50 Answers

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

bunnydawg
  • 5158 Answers

SOURCE: 88 Jeep Cherokee Transmission Fluid Leak

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

  • 1392 Answers

SOURCE: 1994 Jeep Grand Cherokee Laredo. Can't find a

Go to a parts store and get another hose clamp. They are like 50 cents.

Posted on Aug 14, 2009

  • 236 Answers

SOURCE: Bottom trans cooler line damaged: How could this

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"

johnjohn2
  • 5763 Answers

SOURCE: jeep 2002 Transmission Over-Temperature

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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Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

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Depending on what type of vehicle it can take as much as 16 to 18 quatrs of ATF , if you are completely flushing the unit. if you are just dropping the pan and draining it without flushing the torque converter then 12 qts. should be on the safe side, make sure you do not over fill or under fill the transmission, check level while trans is in nuetraul with parking brake set, wheels chalked. please rate my help , thanks

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to have the unit professionally flushed by machine can cost as much as $ 200.00 with flush and filter change...

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Automatic transmission


Fluid can leak out of the driveshaft seals, the input shaft seal, the transmission pan gasket, the torque converter or the ATF cooler and line connections. If the fluid level gets low, the transmission may be slow to engage when it is shifted into drive. Gear shifts may be sloppy or delayed, or the transmission may slip between shifts. If the fluid level is really low, the transmission may cause the vehicle to not go at all.fluid level should be checked when the fluid is hot with the engine idling, the parking brake set and the transmission in Park. If fluid is needed, add only enough ATF to bring the level up to the full mark. Do not overfill because doing so can cause the fluid to become aerated, which may affect transmission operation. If the dipstick reads low, the transmission is probably leaking. So look underneath to see where the fluid is going. If there are no visible leaks, check the radiator for ATF in the coolant. The ATF cooler inside the radiator may be leaking and cross-contaminating the fluids.
You should also check the condition of the fluid. Some discoloration and darkening is normal as the fluid ages, but if the ATF is brown or has a burnt smell, it is badly oxidized and needs to be changed. Varnish on the dipstick is another indication of worn out fluid.
You can also do a "blotter test" to check for worn fluid. Place a few drops of ATF on a paper towel and wait 30 seconds. If the spot is widely dispersed and red or light brown in color, the fluid is in satisfactory condition. But if the spot does not spread out and is dark in color, the ATF is oxidized and should be changed.
Many transmission experts say most transmission problems can be prevented by changing the ATF and filter regularly for preventive maintenance. How often depends on how the vehicle is driven. For some vehicles, this might be every 30,000 miles or two years.
The harder the transmission works, the hotter the fluid runs. The life of the fluid drops quickly once its temperature gets up above about 200 degres F. Installing an aftermarket auxiliary ATF cooler that is parallel to the OEM ATF cooler is recommended to keep fluid temperatures down on vehicles that are used for towing or are driven hard.
ATF also becomes contaminated with normal wear particles from the clutch plates, bushings and gears. The filter will trap most of this debris before it can cause problems. But many older Asian transmissions only have a plastic or metal screen that does little to protect the transmission against internal contaminants and nothing to keep the fluid clean. On these vehicles, changing the fluid is the only way to get rid of these contaminants.
When adding or replacing ATF, use the type specified by the vehicle manufacturer. GM, Ford, Chrysler, Honda, Mercedes and others all have their own specs for ATF. There is no such thing as a "universal" ATF that works in all transmissions. Some fluids meet a variety of specifications, but cannot meet them all because of the different friction additives that are required.
Ford has three automatic transmission fluid specifications: Type F (a non-friction modified formula for most 1964-81 transmissions), Mercon (a friction modified ATF similar to Dexron II for 1988-97 transmissions), and Mercon V (Fords latest friction-modified formula, introduced in 1997).

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