Question about 1999 Chevrolet Tahoe

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My heat doesnt blow out anymore sometimes it'll cut on but the majority of the time it doesnt blow

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If it blows out the top vents but not the floor, it is most likely the blend door actuator.

Posted on Feb 04, 2010

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Heat problem. Heater only works sometimes. Blows out almost AC temperature majority of the time. No engine overheating problems. May or may not be related to actuator issue (vent always open)


Check to see if your heating system is properly filled. Air in system can often prevent the proper flow of hot coolant into the radiator core resulting in your issue.

Oct 20, 2015 | 2002 Chevrolet S-10

1 Answer

My heating isn't working, it sometimes works but majority of the time it blows cold. Also when the engine is running, there seems to be a noise coming from the engine, could these be related? Engine temp...


No heat or low heat in a water cooled engine is worthy of an immediate check as major damage to engine could be the result of continuing to drive it. Things to check:

These two things may cause no heat and possible not ever show as a problem on the temp gauge or temp warning light until far to late:
Low coolant/antifreeze level
Frozen coolant/antifreeze
Stuck thermostat

Other possibilities that may/may not show other signs of trouble as well:
Failing water pump (this would also explain some noise, typically like a grinding, scraping or bad bearing noise)
Slipping belt (Typically associated with the famous belt squealing or chirping noise)
Clogged radiator and/or heater core
Non-operating temperature control valve
Stuck thermostat

Hope this helps!

Nov 24, 2013 | Ford PUMA Cars & Trucks

1 Answer

Heater doesnt blow heat and sometimes works but only on high setting


This depends on what type of heat it is and what you are heating. If it is your car's heating then you have to wait for the car to warm up before hot air blows out.---------------------------------------------------------------------------------------
digiprog 3

Jan 10, 2013 | 2005 Pontiac G6

1 Answer

Custom cruiser heat wont work and stalls


It sounds to me like your engine coolant level may be exremely low and your engine is probably severly overheating. I would recommend checking your coolant (antifreeze) level and checking for possible engine damage due to overheating.

Nov 19, 2011 | 1991 Oldsmobile Custom Cruiser

1 Answer

Heat sometimes works and sometimes doesnt


Make sure that your antifreeze is up where it should be.

Oct 18, 2009 | 2007 Chevrolet Aveo Sedan

1 Answer

I have a 1994 chevy blazer and the heater blows out very little heat. After awhile it sometime starts blowing and other times it don't


take off the feed pipes,close with 2 pairs of mole grips so coolant doesnt leak then flush the heater rad out with a hose doing it in both direction then refit pipes remove the molies and top up with neat antifreeze .that should work

Jan 15, 2009 | Chevrolet Blazer Cars & Trucks

1 Answer

My heat doesnt work why ???


Hi i'm ryan, is it blowing cold air, or just won't come on at all? If its blowing cold air try checking the antifreeze level, low levels will cause it to blow cold air. If it is just not comming on at all, try checking the fuse for the heater.

Dec 21, 2008 | 2003 Jeep Liberty

1 Answer

Fan doesnt blow air or heat anymore


Check the pipes, when you get only cold air, it is often becose one of the air lines is broken.


Oct 10, 2008 | 2001 Mercury Sable

2 Answers

AIR DOSENOT BLOW ON AC ALL THE TIME , SOMETIMES IT DOSENT BLOWING AIR UNTIL I HAVE BEEN ON THE ROAD FOR SEVERAL MINUTES BUT NEVER REACHES ITS FULL STRENTH OF AIR FLOW


Do You mean air doesnt blow cold or fan doesnt blow strong.If you mean it doesnt blow cold that means you need to have a/c recharged.The reason it gets cold after being on the road for a while is because compressor takes time to cool freon when it is very low

Aug 01, 2008 | 2005 Chevrolet Impala

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