Question about 1990 Jeep Cherokee Limited

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1990 jeep cherokee is overheating and we thought the radiator was clogged so we changed it, come to find out it wasn't that because it is still overheating.however we did drive it for a while and never had a problem till now. What else would it be?

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The next thing i would do is to replace the thermostat, it may be stuck closed and causing the overheating. the other thing that can cause this would be the waterpump impeller is rotted and not pushing the coolant or a bad headgasket, the gasket when bad will allow exhaust into the cooling system and this stops the flow of the coolant, theres a test that can be done to check this, you may have to go to a shop or buy a block tester kit, this is a tube that holds a liquid that will change colors if exhaust fumes are in the cooling system, this is done at the radiator fill where the cap is, you would drain some coolant out and then put this over the fill hole and watch it, good luck, i think you may just have a bad thermostat. also i assume all the belts are on, like the waterpump belt, the fan does spin.

Posted on Mar 17, 2011

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Could be a couple of things...make sure your fan's drive belt is not loose....make sure the radiator's finn's are not cloged with leaves etc...or the themostat might be stuck shut.

Posted on Mar 17, 2011

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Check fan if electric check running properly if mechanical bolted to engine check the clutch and belt usually the fan clutch goes and causes the fan not to spin fast enough to draw air across radiator also check belt for proper tightness other problem would be bad thermostat

Posted on Mar 17, 2011

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