Question about 1999 Jeep Cherokee

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The temp gage shoots all the way up as thought the car is overheating but it never does. It also runs a little rough. What could cause this?

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Thermostat.Thank you for asking and I hope this helps you.Please leave me a 4 thumbs up.

Posted on Jul 20, 2010

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Posted on Jan 02, 2017

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I have a 2001 dakota that is overheating. put in new thermostat, didnt help. put in new water pump, still overheating. finally replaced the radiator. still is overheating. what else can I do to fix it


Sometimes when you open cooling system, air gets in, it can cause problems with temp gage.
How hot does it get in degrees F? Is the coolant boiling over? Are you losing coolant? Use a non-contact infra red temp gun to take engine temp, At least we will have a degrees F reading. Most temp gages say hi or lo, cold or hot. I don't know about yours?
Can you check for combustion gases in the coolant?

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The causes of this are many and seldom the same. Please read the info at the link to better understand what to check. If the engine is really overheating the check engine light will come on. Common Causes of Overheating ASC Industries Inc

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Sounds to me that the temp sending unit needs to be checked or replaced, bad sending unit can cause a multitude of problems.... ie Fan not running, Engine running rough, Try checking for voltage at the sending unit with the ignition on but not running. Possibly bad sending unit.. Unit is usually located near the radiator hose that goes into the engine. usually round nut with either 1 or up to as many as 3 or 4 wires coming out of it Check the voltages there.. If you dont have power going in and nothing going out when the engine is warmed its bad.,...

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1 Answer

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1 Answer

Temp Gage shoots up and down


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