Question about 2005 Pontiac Grand Prix
Drain and recover the refrigerant from the cooling system. The system must be cool and the engine off to avoid injury. Remove the quarter trim panel on the right hand side.-------------------------------------------------------------------------------
Posted on Nov 28, 2012
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Posted on Jan 02, 2017
if after replacing all thoughs parts you don't have heat first thing i would do is pressure test your coolant system make sure it is building pressure, if it not building pressure than the water pump isn't working, if it is building pressure than i would check the heater controls some times they come unplugged or the switch fails, thats where i would go next with it, hope this helps good luck
Posted on Dec 05, 2009
You can test your environmental station doors by using the a/c, just change the location of air, by selecting different vent locations, does it go to all locations selected? if not then you have a problem with the control switch or the vacuum doors operated by that switch. The most common door problem is the blend door, it blocks of the heater core for a/c, and opens to allow heat in the vehicle. Your heater core can be clogged, feel the hoses attached to it under the hood while the engine is warm, are they hot? if not the core could be clogged. As far as valves in the heater core lines, look at the lines themselves follow them from the fire wall to the engine connection points, if you see a valve then it may be closed, more than likely you do not have any valves in the system. What is your engine temperature? If it is staying on the cold side on your gauge, then your thermostat maybe stuck in the open position, which will only allow the engine to get to a temperature of about 120 degrees, not enough for heat, I know you put in a new one but if the guage is not showing normal temp then it may not be good. Hope this helps, let me know.
Posted on Dec 11, 2009
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