Question about 2002 Pontiac Grand Prix

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Where is the diverter/controller to send hot coolant to the heater core on a 2002 grand prix? both heater hoses are cold

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Then your thermostat is closed,or your hoses are clogged, or you have an air lock in the engine. In reality, both hoses should be hot, once the engine is up to temperature. Did you recently change coolant ? If so , you may not have bled the air out properly.

Posted on Dec 03, 2014

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Posted on Jan 02, 2017

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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.

Aug 31, 2014 | 2002 Pontiac Grand Prix

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96 dodge grand caravan... blows cold on passenger side when heater on, as well controls reversed. cold is hot nad hot is cold


SOMEHOW I BELIEVE YOUR TWO INTAKE & RETURN HEATER HOSES THAT FEED THE HEATER CORE HAVE BEEN REVERSED. EITHER THAT OR a plugged heater core

Feb 10, 2013 | 1996 Dodge Grand Caravan

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No heat in car ,new coolant ,new thermostat


Had the same problem and turned out to be that the Heater Core was clogged. Took it to a Radiator shop and they blew the system out to unclog it. Cost was $25.00. 2005 Grand Prix.

Feb 27, 2010 | 2005 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

2 Answers

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

2 Answers

2002 grand prix, will not blow hot air, engine heats up fine and cooling system checks ok.


With the engine warmed up feel the heater lines going into the firewall. You will probably find that one is very hot and the other only look warm or even cold. If this is the case the heater core needs to be flushed. With the engine cold remove the hoses at a convenient location and back flush the heater core. Reconnect the lines and warm the engine back up with the heat on.

Jan 11, 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.

Jan 09, 2010 | 2005 Pontiac Grand Prix

2 Answers

There's no heat coming out of the vent, just cold air. What is the possible solution to this problem


possible low anti freeze, air bound heater core, defective heat blend door control servo. Start with coolant level, if o.k. check hoses feeding heater core. If the lines are both hot suspect blend door servo/control unit. If only one hose hot suspect clogged/air bound core. Special bleed procedure for engine. With engine running, check for bleeder scews at upper hose mounting, open bleeder and watch for steady stream of coolant. Be careful as coolant is hot. If this does not help, disconnect hoses frm heater core when cool and blow out core with compressed air to unclog system. I hope this helps.

Dec 25, 2009 | 2002 Acura 3.2TL

2 Answers

Found anti freeze on passanger floor Its a 2002 grand prix SE. Is it simple to fix?


It is likely the heater core.It is possibly a 4 hour or less job

Nov 23, 2009 | 2002 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

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