Heat blend actuator

Tiny
STUPIDTRUCK
  • MEMBER
  • 1994 GMC SIERRA
  • 200,000 MILES
I am replacing a bad actuator. It is in a veryyyyy tight spot I finally got it on but the door shut and stayed shut. Did not open when the temp was swithched to a/c. Pushed on door also wud not open. When I took the old actuator off I cud turn the **** and open and shut the door. What am I doing wrong?
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Wednesday, September 28th, 2011 AT 2:16 AM

10 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Is it vacuum actuated?
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Wednesday, September 28th, 2011 AT 2:17 AM
Tiny
STUPIDTRUCK
  • MEMBER
Not sure. The actuator was clicking and I was told to replace it.
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Wednesday, September 28th, 2011 AT 2:22 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Was there an electrical or vacuum connection to the actuator?
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Wednesday, September 28th, 2011 AT 2:23 AM
Tiny
STUPIDTRUCK
  • MEMBER
Electrical
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Wednesday, September 28th, 2011 AT 2:24 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Okay. Check to make sure there is power to the actuator first. Make sure the plug is properly connected.
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Wednesday, September 28th, 2011 AT 2:27 AM
Tiny
STUPIDTRUCK
  • MEMBER
Yes. With the old actuator the door wud open and shut but it clicked really loud and the heat wudnt work sometimes. With the new one it is completely shut and the heat works but the door doesnt open when changed to a/c. Plugged in and replugged.
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Wednesday, September 28th, 2011 AT 2:30 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
That is odd. Am I correct in assuming there are two wires to the actuator?
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Wednesday, September 28th, 2011 AT 2:40 AM
Tiny
STUPIDTRUCK
  • MEMBER
Yes
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Wednesday, September 28th, 2011 AT 2:42 AM
Tiny
STUPIDTRUCK
  • MEMBER
I cud tell the small cylinder that the door hinge slides onto had changed positions too. There r 3 lines above it and a notch in the cylinder, it started in the middle and when we took it back off it was on the line to the left.
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Wednesday, September 28th, 2011 AT 2:45 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Take a look at the attached wiring schematic. If I recall, the two wires work like this. In one position, power is fed through one wire to direct the door one way. When you switch it, the power goes through the other wire (changes polarity) causing the door to go the other way. Let me know if the schematic helps. To me, it sounds like it is either out of adjustment or the power isn't coming through the opposite wire.
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Wednesday, September 28th, 2011 AT 2:50 AM

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