Question about 2004 Pontiac Grand Prix

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2004 grand prix temp running hot in idle heater and ac wont work and i hear water flowing behind the dash

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  • Contributor
  • 14 Answers

Possible headgasket concern. First step should be CO leak detection test in cooling system

Posted on Jan 10, 2013

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: 2004 grand prix heater will not blow hot air.

i have the same problem, i was just told to change the temp contol sensor which is only about $13.00 gonna change it friday!!

Posted on Jan 28, 2009

  • 333 Answers

SOURCE: Water sound inside 2004 grand prix

This sound you hear is your cooant going to your heater core. Check your coolant level , radiator cap and thermostat. one of these mught be on its way out. If you have no problems with your heat or a/c then flush your radiator and don,t worry about anything. I hope this helps. Don,t forget to rate my answer, thanks

Posted on Feb 27, 2009

  • 72 Answers

SOURCE: grand prix 3800 blowing only hot air please help

check the temp control switch in the dash

Posted on Jun 22, 2009

  • 22 Answers

SOURCE: 1995 Pontiac Grand Prix SE 6v 3.1L running red line hot!

maybe a water pump.

Posted on May 29, 2010

duane_wong
  • 6826 Answers

SOURCE: 2006 grand prix heater only blows cold air. both

Sounds like the temperature blend door actuator may be bad or the vacuum hose to it is disconnected.

Poor Heater System Performance CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.

  1. Start the engine.
  2. Idle the engine until the thermostat opens (upper radiator hose will be hot) Is the engine at normal operating temperature (approx. 200° F)? If yes, go to the next step. If no, go to step 16.
  3. Set the mode selector to FLOOR mode.
  4. Set the heater control selector to the warmest temperature setting.
  5. Set the blower speed the lowest setting.
  6. Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 14. If no, go to the next step.
  7. Set the mode selector to PANEL mode.
  8. Select the maximum blower speed.
  9. Select the warmest temperature setting.
  10. Place a thermometer into the center I/P PANEL air outlet and affix a second thermometer to the heater core outlet heater hose.
  11. Record the temperature at the center I/P PANEL air outlet and at the heater core outlet heater hose. Are the two temperature readings about equal? If yes, go to the next step. If no, go to step 13.
  12. Inspect and repair the cowl, cowl area, recirculation door, and the HVAC evaporator/heater core case for cold air leaks. Repair any problems found, go to step 17.
  13. Inspect the temperature door operation. Repair any problems found, go to step 17.
  14. Turn OFF the engine. Back-flush the heater core. Start the engine. Select the FLOOR mode and the lowest blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Is the inlet heater hose feel significantly hotter than the outlet heater hose? If yes, go to the next step. If no, go to step 17.
  15. Replace the heater core. When the repair is completed, go to step 17.
  16. Check for low engine temperature problems, Repair or replace as needed, go to step 17.
  17. Operate the system in order to verify the repair. If the system operates properly, the repair is complete. If the heater still does not work properly, repeat the entire procedure.

Posted on Nov 19, 2010

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Related Questions:

1 Answer

Hearing water behind dashboard


This could be a simple air pocket. Run vehicle with radiator cap off. You will see air bubbles come up. Usually the fan will cycle on and off 3 times and both upper and lower radiator hoses hot. Remember to turn off all heat ac and defrost as this can prematurely cycle cooling fans. This will get all air out. This is also the way to do it anytime coolant is needed and or cooling repairs are done.

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My 2004 grand prix has a hole in the heater core. unfortually becuase of my financial situation i am not able to fix so i bypassed the heater core. but now my car is running hot. it never did before....


1) Are you sure that you got all the air out of the cooling system after your heater core bypass surgery?
2) Did you bypass the heater core by plugging the two hoses to each other, or did you cap the ends of the hoses? If you capped them, try using a pipe nipple to plug them together so water can move through the hoses.

Jan 23, 2011 | 2004 Pontiac Grand Prix

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I have a 2001 Grand Prix SE....the blower motor and heater core have been replaced but I still have no heat...what could my problem be????? have kids and need heat before winter...


THE KIDS WONT MIND THE COLD AS MUCH AS YOU! TRY CHECKING THE FLAPPER IN THE HEATER BOX UNDER THE DASH. IS THE FAN MOTOR BLOWING?

Sep 20, 2010 | 2001 Pontiac Grand Prix

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Check your coolant level in the radiator first. Problem could also be a weak waterpump

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its either of the 3 ur water pump is weak and couldnt supply the right amount of coolant to ur engine / ur radiator is clogged or your thermostatic valve is stuck up that restrict full flow of fluid to the radiator thats why when u use the heater that uses ur coolant hot water as a heating unit the temp. goes down...

Apr 08, 2010 | 1997 Pontiac Grand Prix

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HELLO I HAVE 1995 GRAND PRIX WITH THE 3.1 MOTOR. MY PROBLEM IS IM NOT GETTING NO HEAT. THE TEMP GAGE GOES TO NORMAL WHEN ITS IDELING WHEN DRIVING GET HOT THEN WHEN I PUSH ON BRAKE OR COME TO A STOP THE...


check the fan and water pump one of these is possibly ur problem when ur at idle there is no heat load and the radiator can dissipate that when ur driving causes more heat if fan isnt working the car wont cool same if problem is water pump at idle pump may be able to move some of the hot anti-freeze but when driving may not be pumping it thru radiator to cool

Dec 22, 2009 | 2004 Pontiac Grand Prix

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Gurgling water sound in dash


U HAVE A BLOCKED AC CONDENSATION DRAIN TUBE, IT EXITS AT THE BASE OF THE ENGINE FIREWALL UNDER THE CAR ON THE PASSENGER SIDE.

Nov 05, 2009 | 2004 Pontiac Grand Prix

2 Answers

Grand prix 3800 blowing only hot air please help


check the temp control switch in the dash

Jun 19, 2009 | 2002 Pontiac Grand Prix

1 Answer

Water sound inside 2004 grand prix


This sound you hear is your cooant going to your heater core. Check your coolant level , radiator cap and thermostat. one of these mught be on its way out. If you have no problems with your heat or a/c then flush your radiator and don,t worry about anything. I hope this helps. Don,t forget to rate my answer, thanks

Feb 27, 2009 | 2004 Pontiac Grand Prix

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