Make sure none of the radiator hoses are collapsing. Check timing. Make sure there are no air blocks in the cooling system. Make sure the cooling fan motors are coming on.
As far as the heat, with the engine warm and the heater on, feel both heater core hoses. Both should be hot. If they are, check the blend door. If only one gets hot, flush the heater core.
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Wednesday, March 16th, 2011 AT 5:57 PM