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AIR BLOWS FROM HEATER THROUGHOUT DASHBOARD BUT NOT ON WINDSHIELD

Tiny
BOYCEBURNS
  • MEMBER
  • 1996 GMC SAVANA
  • 5.0L
  • V8
  • RWD
  • AUTOMATIC
  • 150,000 MILES
MY HEATER BLOWER MOTOR WORKS GREAT, BUT WE ONLY GET AIR FLOW THROUGH THE DASH VENTS AND CANNOT GET IT TO THE WINDSHIELD
Friday, March 13th, 2015 AT 2:02 PM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
You need to check actuator for defrost under the dash.
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Friday, March 13th, 2015 AT 2:40 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Just to add, see if defrost door will operate. Note the diagram. At the moment I can't tell if door is cable operated or vacuum? I'll have to check for hvac vacuum if vacuum operated.
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Friday, March 13th, 2015 AT 2:56 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
My info on this talks about defrost cable, check the cable and defrost door attach point.
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Friday, March 13th, 2015 AT 3:02 PM

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