2005 Dodge Caravan Heat not coming on and temp guage fluate

2005 DODGE CARAVAN
109,000 MILES • 6 CYL • FWD • AUTOMATIC
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DWROGERS
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Heat takes a long time to come on. the temp guage fluates a little also. when the guage goes up the heat comes on. when the guage goes down the heat goes off. the guage fluates continuously. I have checked the antifreeze and the radiator is full. I recenty had the water pump replaced about two months ago.
Dec 20, 2009 at 5:57 PM
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BMRFIXIT
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Suspect thermostat

check coolant temp in the radiator
and or remove and replace thermostat as 1st step
Dec 20, 2009 at 6:11 PM