2001 Chevy Blazer heater core replaced

Tiny
PAINTERGIRL0319
  • MEMBER
  • 2001 CHEVROLET BLAZER
Heater problem
2001 Chevy Blazer 6 cyl Two Wheel Drive Manual

Just replaced the heater core. I have heat and no more leak. Without tuning on anything while driving. Air is coming out of the vents.. Can adjust the temp by just turnig the temp dial? When I do turn on the heat it comes out of all of the vents. Floor and the defrosters. So I have no control on the dials. What is wrong? Just happy for heat.
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Friday, November 13th, 2009 AT 7:10 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
In this case, you are looking for a vacuum leak. The vent doors are actuated by vacuum. Check under the dash and under the hood for disconnected or damaged hoses that would cause this. By accident, you may have forgotten to replace one or bumped one.

Let me know what you find.
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Friday, November 13th, 2009 AT 7:34 AM
Tiny
SERVICE WRITER
  • EXPERT
There is probably an electrical connector that was not hooked back up to the HVAC Module which is removed to replace the heater core.


http://www.2carpros.com/forum/automotive_pictures/30961_xabla_1.jpg



Check to make sure there is not a connector not hooked up or some controls will not work.
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Friday, November 13th, 2009 AT 7:42 AM
Tiny
PAINTERGIRL0319
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Friday, November 13th, 2009 AT 7:54 AM
Tiny
PAINTERGIRL0319
  • MEMBER
The door actuater on top of the heater core is that run on electric or vaccuum?
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Friday, November 13th, 2009 AT 8:05 AM
Tiny
SERVICE WRITER
  • EXPERT
My BAd, J&N would be correct that it is vacuum not electrical. Was thinking something wasn't re-installed right but was thinking electrical.
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Friday, November 13th, 2009 AT 8:19 PM

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