Question about 2005 Pontiac Grand Prix

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No heat changed heater core and thermostat:)

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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.-------------------------------------------------------------------------------
autel ds708

Posted on Nov 28, 2012

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6ya6ya
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Posted on Jan 02, 2017

  • 127 Answers

SOURCE: No heat; replaced thermostat, replaced heater

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

dennymulford
  • 1055 Answers

SOURCE: I have a 1992 Bonneville with 250K miles on the

the heater hose itself has prob colapsed on the inside replace it and see if that works!!!!

Posted on Dec 06, 2009

moparownr
  • 667 Answers

SOURCE: I have no heat. We have changed the thermostat

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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Was lack of heat in the cabin the only reason you changed the thermostat? Were the radiator hoses hot (or very warm) to the touch before you changed the thermostat? Were the heater hoses hot before you changed the thermostat? Did you get a check engine light and code stating that the engine was not getting (or slow getting) to operating temperature?
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Maybe the heater core is plugged or you haven't bled it properly?
If the heater hose returning from the core to the water pump is NOT hot, while the hose going to the heater core from the thermostat area IS hot, then the heater core is plugged probably.
You need to remove the heater hose while cool,from the thermostat area and remove the hose from the water pump area (that's the outlet of the flow thru heater core) AND THEN take a garden hose with p-is-tol grip type sprayer,and blow water back thru the outlet hose out the inlet hose. This will blow any bad plugging material out the way it got in.
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I changed the thermostat but it still does not heat up what else could be wrong


Heater needs Heater Core, Heater control valve, air diverter inside the car and hot water in the heater core. If you just change the thermostat you must have had a reason. If the car was running hot it could be a radiator clog. If the core is clogged no heat. If the heater core was drained when you changed the Tstat there may be air in it - if so no heat. If the control valve (on the heater hose) does not shift- no heat. If the diverter door in under the dash does not direct the fan air through the heater core- no heat.

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Is the problem the thermostat, or is the heater control blend door not diverting the blower air across the heater core....or is the heater core clogged? The thermostat is actually the least likely cause of cool air in the passenger compartment.

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There are two possibilities, one is the thermostat. Many people remove them which spoils the whole heating / cooling system. Since you changed the thermostat, I would check the heater valve on the heater which allows the hot water to circulate through the heating system.
It may be necessary to remove the heater box and flush the heater core since you talk about a lot of rust, which could have clogged the heater core and / or the pipes leading to the heater.

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My heat works on the passenger side and not the drive i've changed the thermostat and still the problem hasn't changed


If you have good heat on one side, it can't possibly be the the thermostat. Good heat on one side means that there is plenty of hot water (water and antifreeze mix) circulating through your heater core. The thermostat controls the temperature of the water. If you have hot water, the thermostat is not at fault. Your Impala is equipped with what is called "zoned climate control". All the inside air (both sides) is still heated by the same heater core. The difference between a "zoned" system and a conventional system is that there is more than one "blend-air" door insided your HVAC housing. The blend-air door swings back and forth to direct the incoming air either through the heater core (for hot air) or around the heater core (for cold air) The drivers blend-air door may be broken or the motor that moves the blend-air door is malfunctioning.

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