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Heater only works sometimes?

Tiny
MICHELLENELSON
  • MEMBER
  • 1996 BUICK LESABRE
  • 100,000 MILES
The fan for heater always works but the heat that comes out is only there once in a while. Was working all the time?
Sunday, January 22nd, 2012 AT 7:14 PM

8 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Are you saying, the blower motor always works ok, but, no air from vents? You may have to check actuators under the dash. This guide will help with diagrams below

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

Check out the diagrams (Below). Please let us know what happens.
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Monday, March 22nd, 2021 AT 12:57 PM
Tiny
MICHELLENELSON
  • MEMBER
  • 5 POSTS
When you turn it on air comes out. But now most of the time it is cold air instead of hot
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Monday, March 22nd, 2021 AT 12:57 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the air blend door/actuator could be stuck in the cold position
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Monday, March 22nd, 2021 AT 12:57 PM
Tiny
MICHELLENELSON
  • MEMBER
  • 5 POSTS
Ok can you tell me where that is please and I will go do it. Lol its 15 degrees here
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Monday, March 22nd, 2021 AT 12:57 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If your heater hoses don't get hot, you fighting a losing battle, with extreme cold.
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Monday, March 22nd, 2021 AT 12:57 PM
Tiny
MICHELLENELSON
  • MEMBER
  • 5 POSTS
Ok we will check the hoses and see if they are hot. My husband says sometimes it starts out hot air for a few seconds then it just goes cold and sometimes it just heats right up. Will check the hoses thank you
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Monday, March 22nd, 2021 AT 12:57 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have you replaced the thermostat? This is the one that controls the temperature
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Monday, March 22nd, 2021 AT 12:57 PM
Tiny
MICHELLENELSON
  • MEMBER
  • 5 POSTS
Yes thermostat and today water pump
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Monday, March 22nd, 2021 AT 12:57 PM

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