Question about 2002 Dodge Durango

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Temp gauge running hot when I slow down, is it the thermo, or maybe a rad flush

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Check for loose waterpump belt,leaks,first,also check your cooling fins on your rad,for bugs,ex.hose it off,this helps also.Then a flush if it needs it.

Posted on Jun 29, 2009

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More probable is fan clutch

Posted on Jun 29, 2009

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I have a 02 Grand caravan that has new radiator, termostat, one new fan. the temp gauge goes up to max hot the drops right back down in seconds. what could be the problem?


it could be you have an air lock in the cooling system
remove the rad cap from the rad, start the engine and let it run until the coolant drops (add to fill it back up) or until the coolant boils out of the rad spout.

maybe pull the heat sensor. -replace it OR clean it off, reinstall it.

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If running ok at idle and not running hot, then I'd first examine my rad hoses very carefully, especially lower rad hose. If old and soft, easy to squeeze then replace it/them. Also replace rad cap as well. A soft hose may be collapsing when engine RPM increases, and restricting flow through engine. Next would be to observe water flow with engine running to be sure water pump is doing it's job. I assume you have cleaned and checked rad already. Note: if you run at highway speeds and it gets hot, try turning heater on high fan and hot setting to see if temperature gauge goes down at all, which would make me lean toward a faulty radiator.

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I have a 96 sl saturn. takes half an hour for my car to reach running temp. When i start driving the engine cools down so far, to the point i have no hot air for my heater. I replaced the thermastat, i...


replace the thermostant again this time get a hotter temp thermostant and buy it from the dealer, the other thing is that these cars are known for the temp sensors being bad this would give you the false reading on the gauge but would not affect the heat, if its taaking a long time then i would replace the stant and this time or before replacing the stant i want you to flush out the heater core, remove the hoses from the heatercore and use a water hose to flush water through the heater core, a plugged core will not throw heat or will start to allow water to flow when it gets good and hot to flow through the retricted core due to rust and crud, try the flush first and then try a new temp sensor if the flush helps the heat, hope this is helpful good luck.

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1 Answer

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4 Answers

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It sounds like the cooling fan is not working, with the motor off look in front of the motor and there is a fan or 2, check the wiring and plugs, some times they corrode and can be cleaned with alloy wheel cleaner then water then spray oil in them otherwise the fuses and the thermo switch need checking.

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With what you describe the problem to be I would have the radiator flow checked. Sounds like it may be clogged if not the pump is probably bad. The head gasket should be o-kay due to no loss of fluid or smoke out the tailpipe. Do theses checks and you should find your problem.

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2 Answers

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1 Answer

Intermitant temperature


Check to make sure your thermostat works right by monitoring the warming up of your engine. With a completely cold engine, start and run the engine for a few minutes, then put your hand on the top radiator hose to monitor if and when it gets warm as the thermostat opens more and more and note the gauge reading( if it works) the top radiator hose should be unbearably hot within 5-8 minutes. If the therm. opens right it should close right aswell, staying open a little while eventhough the radiator may have cooled may be what you are experiencing causing the rapid cooling and is nothing to worry about. The Hose should not get warm very soon after starting the engine. Regarding you gauge, lets take one step at a time, verify proper op. or the therm.

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2 Answers

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try changing the fan clutch if you dont have any leaks. make sure there is nothing blocking the radiator or condensor. good luck

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