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Heater not working

Tiny
ANONYMOUS
  • MEMBER
  • 2008 PONTIAC GRAND PRIX
  • 74,000 MILES
Minimal hot air coming out of vents. I have flushed the system including the heater core, changed thermostat, checked the three electonic valves for recir, heat flap and vent positions and they all work. Any ideas?
Tuesday, November 20th, 2012 AT 5:23 PM

26 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Are both heater core hoses getting hot? IF so (and the blend air door is working), you should have heat. If only one side is hot, chances are you still need to flush the heater core again.

Here is guide to help you

https://www.2carpros.com/articles/car-heater-not-working

Please let us know what happens.

Cheers
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Tuesday, November 20th, 2012 AT 5:49 PM
Tiny
SHAQUITA031
  • MEMBER
  • 1 POST
  • 2008 PONTIAC GRAND PRIX
  • 121,007 MILES
When I turn on heat in car it used to blow out sometimes and sometimes it does not blow out for the last week Heat have not been blowing out when I adjust the knobs I can hear noise but I can't hear or feel heat blowing out I replace the blower motor and the motor resistor what could my problem be?
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Saturday, November 18th, 2017 AT 2:47 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try upulling the hvac fuse inside car for 60 seconds then reinstall see if it works then. One of the actuators may be screwing up or not getting power or a door has broken in heater.
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Saturday, November 18th, 2017 AT 2:47 PM (Merged)
Tiny
LIZHOLLEY
  • MEMBER
  • 1 POST
  • 2008 PONTIAC GRAND PRIX
  • 6 CYL
  • AUTOMATIC
  • 99,000 MILES
My heater isn't blowing hot air just cold. The radiator has fluid but it has some brown gunk in it. The blower works good just cold air and one of the hoses is hot when the temp gauge shows good I need a easy cheap fix if possible
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You probably have a blown head gasket due to brown gunk but pull hvac fuse inside car with key on and reinstall it may reset actuators. Your temp one isn't working. Both hoses should be hot as well.
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
CREED5
  • MEMBER
  • 3 POSTS
  • 2006 PONTIAC GRAND PRIX
Heater will only blow slightly warm air, will not get hot. Air conditioner works perfect.
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Check heater core hoses going into core from engine for hot. I use an infrared temp reader I picked up at harbor fright for $10.
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
SHAWNALFREY
  • MEMBER
  • 19 POSTS
  • 2006 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 115,000 MILES
Not sure the identity of the hoses. I have no heat all of a sudden. Worked fine last winter. With the actron scanner the temp reading went up to 217 and back down to 192-194 the temp on the hoses was upper radiator 170 and lower radiator 114 hoses to the heater core lower 125 and upper 170. Is the heater core clogged and needs to be flushed or could it be the thermostat.
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Pull hvac fuse inside car and see if actuators reset do this with key on for 60 seconds then wait another minute and see if that cures it. If both hoses are hot then you don't need a tstat it may be the temp actuator not working.
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
SHAWNALFREY
  • MEMBER
  • 19 POSTS
Its kinda luke warm but not hot its warmer than before. Shouldn't it be blowing hot air
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Did you pull the fuse like I said with key on? Both of your heater hoses should be hot to the touch. If you did that then it may be air in system as well. Try bleeding air from system before flushing heater core and see if that helps. See pic. Open screw when hot, let it run out until you see a steady stream of coolant then close it. Make sure system is full of coolant if it is low right now have it pressure checked for intake/head gasket leak. Low coolant is the number one cause of low or no heat
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
SHAWNALFREY
  • MEMBER
  • 19 POSTS
Yes I did and I'm gonna go try bleeding it now. Ill get back at ya in a few.
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
RAIN1671
  • MEMBER
  • 1 POST
  • 2006 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
Heater problem
2006 Pontiac Grand Prix 6 cyl Two Wheel Drive Automatic 90,000 miles

My thermostat gage stays at the cold-1/4 mark and isnt pumping out any heat. We changed the thermostat, water pump and cts (?) Sensor. The system was flushed and pressurized, no leaks. Still NO HEAT! And gage still tempormental? Help please, im about frustrated and am supposed to be driving 4 hours outta state thursday, should I still drive it?
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
FUNGUY4
  • MEMBER
  • 39 POSTS
Hi, rain1671 sounds like to me your heater core may be plugged up! If you look under the hood on the back wall u should find 2 hoses going into the wall under the hood into the dash of your car. I would try disconeccting it and blowing it out with air or a water hose. If you use a water hose make sure u get most of the water out to where u have a 50/50 mix of anifreeze. Also, make sure you do this when the car is cool. Hope this helps :)
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
SHAWNALFREY
  • MEMBER
  • 19 POSTS
Ok no air just spit out fluid. I didn't take it all the way off.
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You don't need ot take all the way off. Temps seem ok did you take fuse out for hvac? With key on if not have it scanned for codes see if actuator is getting power or not. A garage will need to do that.
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
SHAWNALFREY
  • MEMBER
  • 19 POSTS
I noticed the air got warmer when I took it for a drive. But the actuator is that on of the things behind the glove box. I just replaced those this year.
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Yes but there are a couple of them. 1 is mode actuator and 2 is temp actuator.
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
MOBETTA1998
  • MEMBER
  • 1 POST
  • 2006 PONTIAC GRAND PRIX
Heater problem
2006 Pontiac Grand Prix

my car does not have heat. I have added more dex cool coolant thinking that it was low and still no heat. What other steps do I need to take before having to go to the repair shop?
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
With engine warm, quickly touch the upper and lower heater core hoses, if one is hot and other is warm, then heater core is blocked.

If both hoses are cool then thermostat may be wide open, not letting car to warm up.
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Saturday, November 18th, 2017 AT 2:48 PM (Merged)

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