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2004 Mercury Mountaineer Question: during warm up,it pushes antifreeze into the ovrflow tank'temp gauge goes to hot

 

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azm41g, 4.0L V6, Kendall Park, NJ, November 20, 2012, 17:57
 Rookie

then wwhen the thermostat opens it sucks the antifreeze back in and it's fine untill the engines cold ,then it does it again ! New thewrmostat, antifeeze ,fushed hearter core engine & rad ,! IS water pump bad,rad pluged? Pressure checked holds 16 lbs

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