Heater not working

MAXPAUL123

MEMBER
1999 OLDSMOBILE SILHOUETTE
6 CYL
FWD
AUTOMATIC

Would a vacuum leak effect the back heater as well it is working fine

Friday, December 10th, 2010 AT 7:20 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,867 POSTS

I'm not sure I understand. What is happening? You mentioned it is working fine but it also sounds like there is a problem. As far as vacuum, yes it can have an affect.

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Friday, December 10th, 2010 AT 7:23 PM

MAXPAUL123

MEMBER
5 POSTS

Well my heater would'nt change levels and it wont change form cold to heat and I have heat on the back heater in the van. Okay I found a bad vacuum hose it took care of the Bi-level changing problem but still no heat on the front heater checked heater core both hose are hot checked antifreeze good level.I not sure which switch under the dash controls the heat/air

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Friday, December 10th, 2010 AT 9:58 PM

JACOBANDNICKOLAS

MECHANIC
109,867 POSTS

It is called the blend air door. It is located near the heater core and is responsible for determining if you get AC or heat. If both heater core hoses are hot, there is good flow through the heater core. Thus, I think you found the problem, the blend door.

Let me know what you find.
Joe

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Monday, December 13th, 2010 AT 5:42 AM