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Temp gage rises to hot and then drop immediately back to normal. Plenty of water in system. What could be causing problem.

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There may be two reasons for your problem. The thermostat may be out of specification and opens much later than it should. As your guage is telling you, the coolant gets extremly hot and finally the thermostat opens and allows cooler fluid to circulate and the temperature at the coolant sender goes down lowering the needle on the guage. Also you may have an air block somewhere in your system. You may try to bleed the system if there is a bleed port or vent. Otherwise leave the cap off and run the car up to temperature watching the coolant level in the radiator through the open foller neck. When the thermostat opens the coolant will drop rapidly if there is an air block. Be careful when you try this one because if the thermostat is not opening in time hot fluid will spurt out of the filler neck. My guess is it's the thermostat if you have not had any leaks and have not changed fluid or done anything else to the coolant system lately. Hope this helps.

Posted on Dec 30, 2010


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