Question about 2005 Pontiac Grand Prix

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Heater problem My 1999 blazer does not give much heat. If I put the selector switch to the A/C mode and put the temp dial to hot I then get alot more heat. But when I use the heat settings the correct way I don't get much heat and it does not seem to blow out as much air as it used to. The heater core is not plugged at all. I am thinking this has something to do with the flaps or something not working correctly under the dash. Any help with this would be greatly appeciated. no interior heat, engine gets warm good pressure on radiator hoses and heater hoses, water pump and t-stat ar both new and correct, blower motor operates correctly as well as the ventalation system.

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It is the control selctor control cable or rod

Posted on Sep 24, 2008

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Try to get reference to owner manual of your car. if you don't have any answer to your question, contact the manufacture , he will give you more information. It is simple a small call and they help you .

Posted on Sep 24, 2008

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1 Answer

Why does my heater only blow hot air?


if only blows hot from defrost location only, then there is a vaccum leak from intake manifold to the selector switch. or the vaccum selector switch is defective. if it is a electric selector switch then the mode door is broken, common issue. when the truck if first started, is there a repetive clicking noise? if so then it would be the mode door being broken, warrenting having to remove the dash and recovering of the air conditioning refridgerent, or freon, r-12, or r-134a as this year is R-134a, draining coolant as heatercore needs removed, and removing the entire heating and airconditioning unit, located behind dash on passanger side, disasembling and replacing door. if clicking noise is pressent and time and money, and certified air conditioning mechanic not available, then finding the mode door actuator, or electric motor that turns the door, and unplugging it will cause the noise to stop, but forever have no airconditioning, as default location is defrost. if able to select from defrost to panel or floor location but heat only, then blend door is broke. i believe mode and blend door are same part number, but might not.
also check for recalls and tsb's, or technical service bullitions, as might help fix it. recalls are free, and tsb's are only to help you diagnose the problem, and you would have to pay to have fixed or fix yourself, but having to evacuate and recharge air conditioning system and haveing to have the special tools to remove ac lines it may be a job best suited for a professional. GM UPFITTER Technical Bulletins GM RECALL CENTER

Sep 12, 2014 | 1997 Chevrolet Blazer

1 Answer

Why is heater not blowing hot air on 99 chevy blazer


if the fan blower is working then it must be the heater valve inline with the heater hoses. Or the selector on the dash has broken and is not connected at the back. You have tried everything else. You were correct in what you wrote above and have tried so far

Nov 21, 2012 | 1999 Chevrolet Blazer

1 Answer

1999 f-350 with a 7.3 diesel, turned heater on can't get temp control to switch back to ac. blowing both hot and cold air. Thanks


possible blend air door motor stuck, try tapping lightly on the servo motor while moving the temp selector from hot to cold,

Jan 22, 2010 | 1999 Ford F350 Regular Cab

3 Answers

NO heat.... Just is blowing cold air, never warms up. Do I just need to change the thermostat or is this going to be a bigger job? And where in the hell is the thermostat!?!?! (yeah, I have worked on allot...


Forget the Thermostat.
Start with no $.
Check Heater Core, leaks in rubber hoses ( they go to the firewall, should be hot when touch them (2) ) Coolant Level.

Nov 07, 2009 | 1999 Mitsubishi Galant

3 Answers

HEATER NOT WORKING IN 2001 LEXUS RX 300


you most likely have a bad airmix servo. this happens alot on these. they are expensive to replace too.

Sep 10, 2009 | 2001 Lexus RX 300

1 Answer

Heater not hot


Hello;
Could be a combination of things. First replace the thermostat with a new one. Then backflush the system, that should fix ya right up. Hope this helps, Thanks;
Rich
RPM Northwest

Feb 04, 2009 | 1999 Chevrolet Blazer

3 Answers

My 1999 chevy blazer will not blow heat


ther are two small tubes that open and close the valve to let in the hot air' one is from right under the carb intake and goes to the right (looking at the engine) right behind the fuse box. if there's o hole in that tube the heat will not work. just change mine becase the tube dry-rotted

Jan 08, 2009 | 1999 Chevrolet Blazer

1 Answer

CONTROL SWITCH HEATER


the problem is not the selector, it is the air temp control blend door motor, the only way to fix this is to remove the dash, there is no way to manually close the door for heat because you can not reach it.

Dec 17, 2008 | 2000 Chevrolet Blazer

1 Answer

Heater problem


I had one of these at my shop recently and I fixed it by replacing the heater control panel. I went for the resistor first with a known good one and it didn't take care of it. I bought a new heater control panel and that took care of the problem.

Oct 07, 2008 | 2002 Chevrolet Blazer

3 Answers

Heater problem


do you have the correct thermostat in the vehicle? it is possible that the blower motor and or it's controls are going bad. if you have a cooler themostat in the car the heat will be less hot because it circulates more frequently and does not get as hot as it would with a hotter / correct thermostat.

Sep 22, 2008 | 1999 Chevrolet Blazer

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