Question about 1999 Jeep Grand Cherokee

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MY jeeps still overheating after i replaced the radiaitor and thermostat. then took thermostat out and it is still overheating and the hose becomes swollen wen overheated.

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Hi u need to check viscos fan hub with motor off spin the fan if it spins freely with no resistance the hub needs to be replaced.

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Would have to be the water pump then.

Posted on Dec 29, 2010

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Overheated. Why won't it start?


I'm not really familiar with JEEP mechanics but if you've replaced your water pump and it's still overheating with full water/coolant level, you should check the thermostat; when it fails, it's a common cause or overheating in all kind of cars

I'm attaching some links to Youtube tutorial about replacing thermostat in a Jeep but you can expand your Google search using terms
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You need to either go buy a new thermostat, (because as always 3 out of 5 are bad off the shelf) so try a different one.
Also you can try bypassing your heater core see if it happens again. if it doesn't it's your heater core...other wise your radiator may be bad too... Try the thermostat first though. Good luck,.

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98 jeep grand cherokee front diff loosing fluid thru vent hose and overheating


sounds like you have blown the internal heater matrix and the thermostat is not working or is blocked. you are going to need a new matrix and thermostat and a bloody good flush out of the system just in case there is something in the system means taking off the rad hoses flush them out from both ends. and doing the same to the engine. replacing the matrix as its not going to be able to fix it if its shooting water out of the vents change the thermostat check pipes for damage.

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2001 jeep grand cherokee over heating.building up alot of pressure.found crack in radiat5or and replaced it.changed thermostat and cooling sensor,still over heatd with alot of pressure.thought maybe i...


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2 Answers

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The sensor would not likely have shorted, but the sensing material may have changed due to overheating. The thermostat may also be in trouble. Replace both, then take the car to Autozone or similar business for a free computer scan, which can remove any error codes. Then drive the car to see if it resets further codes. Make sure the cooling system is topped up in both the radiator and the overflow tank. Check your other hoses for condition and replace if necessary. If the entire engine overheated, be on the lookout for antifreeze leaks around the heads and for strange misfire codes. It may have warped the heads from excess heat. Hope this helps!

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1 Answer

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