Question about 1999 GMC Suburban

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Heater vent blows air when driving and blower is turned off.

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This happens on vehicles that are a few years old you just have to deal with it.

Posted on May 03, 2013

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: heater blower does not come out vents

i had the same issue and it was the vacuum hose that goes over the alternator to the ac unit

Posted on Oct 30, 2008

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SOURCE: heeter is blowing cold air

Okay... First off I am no pro on fixing cars, but I did have this same problem. What I had to do is drain the radiator completely, then use prestone radiator flush to totally clean out the radiator. Once this is done go ahead and refill it with fresh radiator fluid. ONE BIG THING.... Do not replace it with DEXCOOL! This is a reddish orange color coolant, and is what caused you and me the problem to begin with. Make sure you use green coolant and mix it 50/50 or buy the premixed stuff. Like I said, I am no pro so I had to look up exactly how to do this. It took me around an hour and a half. Here are the instructions I used.
http://autorepair.about.com/od/regularmaintenance/ss/coolant_flush.htm Hopefully this helps. E-mail me at raspyjaspy@hotmail.com and tell me if this worked for you as it did for me!

Posted on Dec 16, 2008

picatudo
  • 239 Answers

SOURCE: 2001 gmc jimmy defroster-heater blower will not direct heat

you have a vacuum leak

Posted on Jan 07, 2009

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SOURCE: 2002 GMC Yukon blows cold air from the front, rear works fine

check you antifreeze level and make sure its full

Posted on Jan 26, 2009

  • 1 Answer

SOURCE: Dash vents will not blow air. Defroster and floor vents blow fine.

Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.

Posted on May 23, 2009

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1 Answer

A friend replaced my Heater Core for me and it still does Not blow Hot Air ...can you give me some trouble shooting ideas to check ?


Does the heater blower motor work? That is what blows cool air across and around the heater core and then through the case and out the vents as warm air blowing. The heater motor wiring circuit is separate, and gets pretty complicated with electronic HVAC controls, but it does have fuses.
If the blower motor works but you only get cold air, not warm, out the vents, then you have a problem with the heater case doors not operating properly. yes, the old temperature blend door problem, the actuator motors or the vacuum servos not operating the doors. By the time you get all that figured out and working again, you will be an HVAC expert in your own right. Your turn for a comment...what model and year of car anyway, are we talking about?

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I have a 2000 gmc jimmy, everytime i start it up after a snowfall and turn on the heater snow blows out of all my heater vents


the heater blower gets the air from a chamber at the bottom of the windscreen and this area would be full of snow so I would expect that some snow would be drawn into the car on start up of the blower. Try changing the vent setting to car recirculation so that the car air is used and not outside air.

Jan 03, 2014 | Cars & Trucks

1 Answer

Heater not blowing hot air


when you operates the heater button worm water of your engine's water jackets enter to the evaporator locates inside your A/C blower & air flows through it & air becoming worm. Therefore I proposed you to check your vent linkages for vent doors inside the blower unit.

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My 2003 Camry vents are not blowing any air no matter what speed or tempature. But when I turn the defrost on a slight bit of a/c or heat (depending what I set it on) comes through. But the little bit of...


Can you hear the blower motor running ?
Could be a dirty cabin air filter, or blower problem, or blend door problem. The blend doors direct air thru the heater core and evaporator core as well as the vents.
If you have not replaced the cabin air filter check your owners manual on how to check it.

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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.

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A/C and Heater will not blow air..


Blower motor resistor is most common ($20-$70) it controls the blower motor fan and speeds or fan relay fuse (usually under the hood) If it's not either then the blower itself is bad. You can pull the motor and apply 12volts to it to test, if it spins then the resistor.

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You may have some debris blocking the passage of the vents. You may want to open the dashboard to investigate further. The blower motor may be running but it may not be driving the actual fan.

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Heater/AC won't blow out air


blower motor is behind the glove box. also check the blower resistor it should be nex to the blower motor

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