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2004 grand prix blows hot air but does not blow cool air

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  • Yolanda Rivera
    Yolanda Rivera Apr 29, 2017

    That makes perfect sense to me. Ok so if this works...how much do I owe you? lol

  • Jeff Armer Apr 29, 2017

    Not a thing , early christmas present .

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  • Cars & Trucks Master
  • 11,486 Answers

Does the A/C compressor turn on when you push the A/C button ? Is the A/C system full of refrigerant ?

Posted on Apr 29, 2017

Testimonial: "yes we believe it is the evaporator"

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  • Jeff Armer Apr 29, 2017

    You believe what is in the evaporator ?

  • Yolanda Rivera
    Yolanda Rivera Apr 29, 2017

    The A/C compressor does come on. Air blows but it is hot air and we have put freon in it car but it just blows out. We changed the expansion valve coz that was dirty but the air is still warm air. When we put the freon in the system, it all blows out. Not sure if it is a leak in the hoses?

  • Jeff Armer Apr 29, 2017

    Could be the condenser in front of the radiator also ! Put a can of refrigerant in that has leak detection dye . They sell kits at parts stores . Has a special light an glasses to find the leak . Or they sell other leak detection tools .

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Posted on Jan 02, 2017

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1 Answer

Hot heat at idle cool when driving


is there a chance that one of your heater hoses are clogged? or where they connect to the engine are clogged still? sounds like a clogged system. Cracked heater housing? Outside air bypassing the heater coil while driving?

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1 Answer

2004 grand prix air not blowing


you should have a burnt connector (wire plug) at the blower motor resistor or a bad blower motor (or bad resistor) you should be able to discern which is bad by inspecting them closely.

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1 Answer

1999 pontiac grand prix gtp dual airconditioning problem, driver side air condition is blowing hot passenger side blowing cold


Two things can be the problem,first,try adding ,a little freon,if it is low,it will only cool one side,then if this does not help,there is a door actuator motor that controls this,it could be not working,the dash has to come out to replace this actuator motor,if this was at all helpful,please rate,thank you.

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1 Answer

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Have your fan checked out, because without the fan the compressor will overheat, and so will the condensor. This will prevent cool air from blowing.

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My heater on my 2002 pontiac grand prix blows hot then cold air my wife hit a huge pothole on sunday then after that this started doing this please help


check you climate control vacuum hose. it may have come loose or crimped. its located beneath and under battery mount box. also check to see if your coolant resvouir is full as well as your resivour cap is tight.

Jan 26, 2010 | 2002 Pontiac Grand Prix

1 Answer

2005 Grand Prix heater works fine when blower is off-air coming thru vent gets hot; once blower is turned on air turns cold. Why?


Sounds like a clogged heater core- insufficient coolant circulating through heater core, and as soon as you blow air past the core, it get cooled off.

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2 Answers

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check the temp control switch in the dash

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1 Answer

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2 Answers

2004 pontiac gran prix gt


I would suggest replacing the blower motor resistor. When this component fails the blower will only work on one spped or none. This is a very common issue with all automotive models

Nov 04, 2008 | 2004 Pontiac Grand Prix

1 Answer

A/c and heater


Is it leaking antefreeze?
The thermostat might be gone or needs a bigger thermostat
It could be a vaccum leak for the drivers side blowing cool air and the passenger side blowing warm air
Does it have dual air control switches one for drivers side and one for passengers side?

Oct 28, 2008 | 2003 Pontiac Grand Prix

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