Question about 2001 Jeep Grand Cherokee

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Over heating, brand new thermostat, fan clutch

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Make sure the thermostat is orientated correctly. If it is in upside down it will not open. Also are the radiator tubes clean? If they are clogged you will not get the flow you need through them to bleed off the heat. If that is the case you will need to have the radiator rodded and cored. You also didn't say what year the vehicle is.

Posted on Feb 17, 2009

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Fan relay under right headlight

Posted on Feb 20, 2009

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2003 chevy trailblazer cooling temp running 230


Smart man using a scanner for the actual temp. Assuming you're not losing coolant....2 things I'd look at here, 1st is you may have air in the system, make sure to purge all the air. 2nd is your fan clutch, I've replaced a few fan clutches in my own Trailblazer. Have had them bad right out of the box brand new. Have had bad brand new fan clutches on 2 of my last Trailblazers. You should hear it engaging especially in stop and go traffic.

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Could be a Bad radiator Cap? Low Water? Clogged radiator? Not enough air flow, Do To.... Dirty radiator fins? Bad Fan Clutch or Electric fan not running? Timing Off? Stuck closed Thermostat? Bad Water Pump? Blown head Gasket(s)? Cracked Cylinder Head(s), ECT....

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Over heats new thermostat hest almosts pegs then comes down


If you replaced the thermostat I would look next at the electric cooling fan thermostat.. Its likely located in the radiator itself and is in charge of turning on the electric fans.

To check. start the car and listen for the fan next to the radiator to kick on. It should start running before the car gets over heated.

Also when the temp gets really high is the radiator hot? if not then you still have a coolant flow problem. If the radiator IS hot then you have a problem with the coolant not getting cooled. Either an electric fan/thermostat of if you have an engine driven fan maybe its clutch is bad.

Jun 18, 2011 | 2000 Mazda 626

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Truck will not heat up. I have put a new thermostat in. Also it has the right mixture of antifreeze, and clutch fan is working. Radiator, and hoses don't get warm!


Make sure the new thermostat was not put in backwards, tap on thermostat housing lightly could be stuck in the open position.

Jan 07, 2011 | 1995 Isuzu Pickup

1 Answer

My jeep over heated today. The radiator is full as is the resevior. I'm not sure if it is the fan or the thermostat?


ITS THE THERMOSTAT MORE LIKELY.CHECK CLUTCH FAN SHOULD HAVE RESISTANCE WHEN HOT.MOVES FREELY WHEN COOL.IF FAN WOBBLES OR SPIN FREELY AT ALL TIMES FAN CLUTCH IS BAD.

May 28, 2010 | 2001 Jeep Grand Cherokee

2 Answers

Truck is over heating. changed thermostat. still


Hello, you may have a blockage some where in the system or possible air in the system. Double check your coolant levels, your cooling fans make sure they are coming on. Hope this is helpful.

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1 Answer

I have a 2000 Dodge Dakota Quad Cab 3.9L V-6 w/ cooling problems


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1 Answer

Rapid overheating. New thermostat didn't fix it. Head removed... gasket ok. No apparent cracks in head. Main fan/clutch seems to work ok. Any ideas ? Mike in NZ


I know that this is going to sound like of dumb but I would check and make sure your thermostat was installed the correct way. I had a similar issue once, after replacing the entire cooling system on a 750iL it still over heated, turned out I put in the thermostat the wrong way. Always check for little mistakes first:) Hope this helps and please don't forget to rate me.

May 21, 2009 | 1999 BMW 323 Series

1 Answer

Over Heating S-10 Blazer......HELP...


How hot is it geting? Does it overheat? Check your fan clutch. It's designed to run free when cold and lock up as it gets hot. If it's not, engine will overheat, especially when driving slow or in traffic (at speed, generally air flow is sufficient to prevent overheat) When you turn off engine, fan should only spin for a couple of turns if at all with hot engine. Usually it will also have some side play if it has failed. In some cases you can see grease leaking from inside.

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