Question about 1999 Jeep Grand Cherokee

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It overheats thermostat was replaced and cooling temp sensor what else could it be

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Bad water pump. Clogged radiator passages. Air pocket in the cooling system. Blown head gasket.

Posted on Feb 14, 2011

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check your thermostat and possibly your cooling fans and temp sensor for the fans

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Car overheats. didn'T THINK FAN WAS WORKING BUT WHEN YOU TURN ON THE AIR CONDITIONING THE FAN WORKS.


You will need to see if the fan operates when overheating, there are diffrent sensors for the cooling and ac cooling, the good thing is that the fan works, this would tell me it may be a bad coolant temp sensor or thermostat, you will need to let it run and as the gauge passes the middle point feel to see if both upper and lower rad hoses are hot, if only one is hot then you may have a bad thermostat, is they are both hot and fan doesnt turn on and car overheats then you should replace the coolant temp sensor, stat with these tests and see the result, hope this helps.

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My 1997 Sebring overheats while in idle but


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Electric cooling fans will work.


The fans are actuated by coolant temp in the radiator. It is possible to have overheated coolant in the radiator, causing the steam, and your engine not overheating...the temp sensor for your engine is reflecting the engine temp, not the temp of the coolant in the radiator. You problem could be a bad temp sensor at the radiator...not allowing the fans to come on. Good Luck! I hope you find this to be very helpful!

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Thermastat stuck and cooling fans do not come on


If your thermostat is stuck in the closed position , it will not let coolant circulate to the radiator and the engine will overheat quickly. Fans won't come on because the temp sensor for the fans is usualy in the radiator. If the thermostat dosn't send hot coolant to the radiator , the fans don't know they should be on.
Only solution is to replace the faulty thermostat. I recomend that you dont drive the car at all with the bad thermostat. major overheat could severly damage Heads , head gasket , engine.

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Car runs hot - can overheat


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2004 dodge ram is over heating, the thermostat and fan clutch have been replaced.Doesn't(over heat) in cool weather,but will in mod. weather if driven over 70mph or hilly terrain due or increase of rpm,and...


Water pumps can stall out, but do you have air trapped in system.
Had you recently had the system "open" to replace hose, thermostat, temp sensor. Some Ford and GM have a bleeder screw on a high point in cooling system to bleed out trapped air.

Check your trans fluid color. Since the trans cooler is built into radiator (automatics)

IF the engine is overheating the trans CAN overheat
IF the trans is overheating the engine CAN overheat

They share the same cooling source and trans fluid gets hotter than oil, but yet it has a wimpy cooler built into radiator. Maybe add trans oil cooler to system.

Also outside temp affects the cool down rate of the radiator, ie...hot air trying to cool down hot radiator/engine is less effecting than cool air cooling hot radiator/engine

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