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Just changed the head gasket on the car. 3.4, ran fine, actually great for a few days, now when I am in idle, the temp will go up to 240 then back down as i drive...fan does kick on.


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you should use a scanner and watch the engine temp and the coolant fan (or fans) for their operation. see if the fan comes on at the right temp and also look to see if the high fan comes on if the low fan is unable to bring the temp down. If the engine temp comes down to normal while driving and the fans come on at the right temperature I would look at the circulation for a problem. Since the only thing that changes when you are driving is the water pump speed and air being forced through the radiator.

Try letting the engine get hot at idle like you say it does (duplicate the conditions as it happens when you drive and come to a stop) When the temperature gets higher than normal (don't let it get all the way to over heat but let it get hot) put the trans in neutral or park and rev the rpm's up to 2000. Does the temperature go down?

if the temp goes down then I would look at a radiator that may be getting plugged up or a water pump not pushing enough coolant.


   
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The cooling system on the 3.4 has a "burping valve" you more than likely have air trapped in your system. The valve is located on the top of the engine. Follow the radiator hose that goes along the top of the engine. you will locate the valve on the engine end of the hose


   
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