Question about 2008 Pontiac Grand Prix

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I have a 2008 Grand Prix and have no heat i have replaced the thermostat and have flushed the heater core a couple of times still no heat any ideas inlet hose gets warmer then the outlet house

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On your controle panel in side your car turn on your heater thermostate and if you do not hear any sound from your controle module it is bad should be under your dash .

Posted on Feb 17, 2013

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Posted on Jan 02, 2017

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SOURCE: i have a 2006 pontiac grand prix 3.8l my heat only blow cold aair I checked the thermostat and the heart inlet hose is hot but the outlet hose is luke war what could this be maybe clogged heater core.

Ok fellow 2006 Grand Prix owners!! By trial and error, I went through the process of elimination because my car would over heat and had no heat inside. After changing the thermostat, I had to replace the water pump. However, after you do this, you need to open the inlet hose bleeder and let the air out a few times. This solved my issue of overheating and I now have great heat!!!

Posted on Nov 02, 2011

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1 Answer

How to flush a heater core in a pontiac grand prix 2002


If you have warm air on one side and cool on the other, you've a situation with the vent flaps. But to backflush the core, take both hoses off the core and run a garden hose to the outlet side going towards the water pump. This will flush it.

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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?

Dec 13, 2013 | 2004 Pontiac Grand Prix

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How to back flush heater core 2007 grand prix


drain coolant system locate heater cores hoses going through firewall you need to buy the radiator flush kit at any auto parts stores. remove heater cores hoses from one end or buy extra long heater hoses same size as heater core hoses in vechicle at auto parts store use the flush kit when you flush through one of the heater core hoses let the other hose drain in a drain pan when you use home garden hose use low water pressure dont use garden hose to the max or you will rupture heater core. your best bet let radiator shop flush whole coolant system. because heater cores hoses are in a tight spot.make sure engine off if you just going to flush out heater core only .after flushing heater core good time to replace heater core hoses.if job too hard or complicated let radiator shop flush out radiator the engine block and heater core because if radiator stopped up or engine block stopped up the gunk and rust will reenter plug up heater core.if you tight on money you can flush out your own radiator.drain out radiator using large drain pan. remove top radiator hose and remove bottom radiator hoses connect to water pump.use garden hose with flush kit part with water pressure not too high put garden hose to top radiator hose run water until clear water run out bottom radiator hose in drain pan,the flush out engine block remove thermostat.if you had another spare thermostat housing with RTV SILICONE SEALANT THAT HAS SET UP INSTALL THERMOSTAT HOUSING BACK TO ENGINE WITHOUT THERMOSTAT FLUSH OUT THE ENGINE BLOCK, WHEN DONE INSTALL NEW THERMOSTAT THEN INSTALL ORIGINAL THERMOSTAT HOUSING WITH NEW ORING WHICH YOU BUY AT DEALERSHIP.IF ALL SOUND COMPLICATED LET RADIATOR SHOP FLUSH OUT COOLANT SYSTEM.

Nov 27, 2012 | 2003 Pontiac Grand Prix

1 Answer

Heat isnt hot


If the heater hoses are hot, problem could be a blend door under the dash. The blend doors direct air thru the heater core and the vents.

Oct 08, 2012 | 2008 Pontiac Grand Prix

1 Answer

Still no heat.....changed thermostat flushed radiator


Possible heater core problem.

Did you check to make sure when you set the heat on that the car climate control move the heat door to allow the heat to come in the vents??

Feb 07, 2012 | 2005 Pontiac Grand Prix

2 Answers

I have a 2006 pontiac grand prix 3.8l my heat only blow cold aair I checked the thermostat and the heart inlet hose is hot but the outlet hose is luke war what could this be maybe clogged heater core.


Ok fellow 2006 Grand Prix owners!! By trial and error, I went through the process of elimination because my car would over heat and had no heat inside. After changing the thermostat, I had to replace the water pump. However, after you do this, you need to open the inlet hose bleeder and let the air out a few times. This solved my issue of overheating and I now have great heat!!!

Oct 23, 2011 | 2006 Pontiac Grand Prix

1 Answer

I am getting a little heat from my 2006 Grand Prix when I put the thermostat all the way to hot and the blower on the lowest setting but not very much. I can barely feel the difference between the temp...


make sure the engine is getting to operating temp (195f) you may need the heater core "flushed" and coolant replaced, usually flushing the core will fix that IF the air temp doors are working correctly.

Sep 15, 2011 | 2006 Pontiac Grand Prix

1 Answer

Had to replace water pump after replacing... heater blows hot air at first then after 8 to 10 seconds turns cool. before replacing water pump i always heard water running through heater core when...


You may have loosened or lost some material into the system while changing the pump and caused a blockage in the heater core. There could be a little coolant going through to warm up but not enough to continue supplying heat once the initial heat is drawn down.
Ideally a back flush through the heater core may take care of it. You should be able to find a kit to help with in an auto parts store.
Open the hood and look on the firewall of the car. There should be 2 rubber hoses going into the firewall and into the car. They will likely have spring clamps just like on the radiator hose. Remove both lines. Then get a hose and put it in one line and run the water until it comes out clear. Then do the same thing with the other side. Do this a couple of times. Then reconnect the 2 hoses ahd check the level of the radiator. Then start the car with the radiator cap off and wait a while for the thermostat to open and have the heater on so it will cycle through the whole system. Then top off as needed.

Jun 14, 2011 | 2006 Pontiac Grand Prix

1 Answer

The heat in the car gets warm but doesn't get hot.


CHECK THERMOSTAT FIRST / CHECK BOTH HEATER HOSES ARE THEY BOTH HOT ?
FLUSH HEATER CORE IF ONE IS COLD AND ONE IS HOT

Dec 09, 2010 | 2008 Pontiac Grand Prix

1 Answer

I want to flush the heater core


Take off the hoses at the bulkhead/firewall that go to te heater core, use a garden hose and back flush the core by forcing water through the smaller of the 2 hose nipples, if the water runs right through then you have a heater air temp control door actuator problem

Dec 24, 2008 | 2005 Pontiac Grand Prix

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