Question about 1996 Pontiac Grand Am

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Heater blowing hot air

I have a pontiac grand am it is a 94 a motor was put in and a new heater core. but the heater only blows cold air like if it was ac

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Sounds like they didn't hook up the heater control valve. or the vacuum lines to the heater controls. Check for both.

Posted on May 27, 2009

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If you have a new heater core inside, some of the probable causes of your lack of hot air include the two heater hoses, heater control cable, water pump, and damper/vacuum door. A handy diagnostic article that explains this will is the following:
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Vehicle_Car_Zone_Cars_Trucks_Vans_Heating_System_Heater_Blowing_Little_No_Hot_Air.htm

Hope this helps!
Brad

Posted on May 27, 2009

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If the two heater core tubes at the firewall are hot, then it's a blend door problem.
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your description ends. what have you put in...
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check your thermostat
check your engine oil if it looks milky you have a head gasket problem aslo check your coolant if there is oil in your coolant you have a head gasket problem

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