Question about 2003 Pontiac Grand Prix

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Heater blowing cold air on my 2003 pontiac grand prix. I put in a new thermostat and flushed the radiator, what to do now... Thanks

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  • Pontiac Master
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It could be a temp door actuator motor that is gone out,it opens the door to the heater box.

Posted on Nov 15, 2009

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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?

Dec 13, 2013 | 2004 Pontiac Grand Prix

1 Answer

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

02 grand prix, running cold


be sure there is no air trapped in the system, bleed out at high point, may need to loosen hose. radiator will get warm when therm opens. Be sure therm is installed correct direction. May need a new one.

Dec 27, 2011 | 2002 Pontiac Grand Prix

2 Answers

My in heater in a 2007 grand prix doesnt work the air blows but isnt hot temperture gauge looks fine an have changed out thermostat


You have a plugged up heater core. Try pulling the heater hoses of where they go into the firewall, put a garden hose with a spray nozzle in one hose and gently flush the system out. you will need to pull both heater hoses off to do this.

Feb 11, 2011 | 2007 Pontiac Grand Prix GXP Sedan

1 Answer

Friends car(2001 pontiac grand prix) 3.8 v6.started running hot,so he replaced thermostat. didn't help. so replaced water pump. helped very little. heater hoses cold to touch and blows cold inside. worked...


yes, but it's designed to drive the air out as long as you open the cap and run it until it's hot, keeping the radiator full. Eventually the air will come out and heater hoses should get coolant.

Sep 24, 2010 | 2001 Pontiac Grand Prix

2 Answers

2003 Grand Prix not blowing hot air. Does the heater coil need to be replaced? If so where is it located?


If the heater coil was bad, it would be leaking radiator fluid... probably into your dash/floorboard (depending on where it is installed in your model car). There is a switch that diverts the hot radiator fluid through the heater coil when you want heat. There is also an air diverter valve that helps to mix the hot and cold air. The fluid valve is controlled by the A/C settings control. The one that you use to choose between heater/air conditioner/vent/ defrost. The air diverter is controlled by the temp mixing controller. The most simple explanation is that one of those valves or the controller of one of those valves is not working. If the hot water cant be diverted through the heater coil, the coil can't exchange the heat (warming the air). If the air diverter (hot/cold controller) cant move to add heat, then all you will feel is air from the vent side (from outside) or from the A/C cooling the air.

I would guess that its either a controller or one of the valves themselves. Odds are, it is a controller. That tends to be what malfunctions first.

Feb 25, 2010 | 2003 Pontiac Grand Prix

1 Answer

THE CAR DON'T GET TO THE RIGHT TEMPERATURE


i dont think it needs a waterpump. what temperature thermostat did you put in? unless the fan is running all the time maybe. i would try another thermostat, the engine needs to be at least 195 degrees to produce decent heat.

Nov 19, 2008 | 2003 Pontiac Grand Prix

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