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No heat

Tiny
OSEPHUS
  • MEMBER
  • 1992 CADILLAC DEVILLE
  • 4.9L
  • V8
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Having trouble with heater only blows warm air out of passenger side defroster cold on drivers side also cold through floor vent.
Wednesday, September 4th, 2019 AT 1:09 AM

11 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

When the engine gets to normal operating temperature, are the heater hoses hot under the hood going to the heater core?

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

Roy
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Wednesday, September 4th, 2019 AT 6:49 AM
Tiny
OSEPHUS
  • MEMBER
  • 19 POSTS
I will check and let you know. Thanks
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Wednesday, September 4th, 2019 AT 7:19 AM
Tiny
ASEMASTER6371
  • MECHANIC
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You are welcome.

Keep us updated.

Roy
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Wednesday, September 4th, 2019 AT 7:25 AM
Tiny
OSEPHUS
  • MEMBER
  • 19 POSTS
Roy, just checked both hoses are hot.
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Wednesday, September 4th, 2019 AT 10:26 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sounds like you have a clogged heater core.

Remove both hoses and use a garden hose and flush out the core. Go through both sides until you have an even flow.

Roy
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Wednesday, September 4th, 2019 AT 10:43 AM
Tiny
OSEPHUS
  • MEMBER
  • 19 POSTS
Roy, aren’t both hoses supposed to be hot?
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Thursday, September 5th, 2019 AT 2:00 AM
Tiny
ASEMASTER6371
  • MECHANIC
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One should be hot and the other is cooler.

Roy
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Thursday, September 5th, 2019 AT 2:09 AM
Tiny
OSEPHUS
  • MEMBER
  • 19 POSTS
Okay, thanks. I’ll try it today. One other question, is there a way to adjust the idle or do I have to get the idle speed control motor?Thanks Roy.
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Thursday, September 5th, 2019 AT 5:17 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
There is a procedure for that. The motor has to be retracted and the base isle set. Then the motor is run out to full length and is adjusted to a spec at that point. Those idle motors were a common failure.

Roy
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Thursday, September 5th, 2019 AT 5:22 AM
Tiny
OSEPHUS
  • MEMBER
  • 19 POSTS
Okay, thanks. I’ll give it a try.
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Thursday, September 5th, 2019 AT 5:28 AM
Tiny
ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
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+1
Thursday, September 5th, 2019 AT 5:30 AM

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