Question about 2001 Jeep Grand Cherokee

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My 2001 jeep gc overheated so bad it broke the plastic tank on the side of the radiator, after replacing it the jeep refuses to start and acts like it has no compression as it turns over, could this be the shutdown switch? how do I reset it?

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A bad head gasket, or cracked head can force engine compression into the coolant system. Plus, coolant in the combustion area will destroy an engine. I would get the coolant system pressure tested. (You might not be able to do this untill the radiator is fixed), or...get a compression and a cylinder leak down test to verify the engines condition first.

Posted on Sep 08, 2010

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It overheats when in traffic ior when it is idling


I have fixed my own 2002 Jeep Cherokee twice for the overheating issue. Overheating can be caused by a number of different problems, but one of the most notorious problems for the Jeep is the 'radiator fan relay switch'. When the temperature thermostat goes over 210, it tells the relay switch to turn on the radiator fan to cool down the engine. If that relay switch isn't working, the fan never turns on and thus your engine overheats. Here's a simple test to check if this is your overheating problem:
1. Start up your Jeep, open the hood, and let it run to the point where the temperature gauge on your dashboard creeps past 210.
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3. Turn off the Jeep asap to avoid damaging the engine.

You can purchase a 'radiator fan relay switch' from most Jeep dealerships if they have a service dept. It should be around $75.
(I saved over $700 by not taking my Jeep to an auto shop to fix this) To change out the relay switch, you need to take off the passenger side front headlight. There's a black plastic guard behind the headlight and the relay switch is located under/behind that guard. If your Jeep ever experienced this problem before, you may see a cut-out where someone replaced this part before. If there's no cut-out, you can check out this link to see a picture of where to cut.
http://rigs.corequipment.com/cebby_WJsite/cooling.htm#relay

Once you switch out the part, you should be golden.

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1 Answer

2000 Jeep GC, stalled in traffic, started later in day when cooler, very hot day, AC was off and not overheating, no problems before.


Could be a several things, start with the easiest first,

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2 Answers

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2 Answers

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First of all make sure there are no air pockets in motor.
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water pump is bad not allowing enough flow through out the vehicle.

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Could be a faulty radiator or too much pressure in the system.
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