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How To Video to Fix HVAC Wild Vent / Blend + Mode Door / Fan Speed

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How To Video to Fix HVAC Wild Vent / Blend + Mode Door / Fan Speed

  #11  
Old 05-07-2018, 02:45 PM
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Originally Posted by mattross257 View Post
I have had this issue where it would not change modes at all. We noticed a sucking sound coming from the dash. Further digging found the mode selector switch is vacuum operated and the ports that are on the back were cracked. We were able to find an old used one that worked just fine. Currently tho, many years later, it seems to have a mind of its own. In cruise control pulling a hill most of the time you will hear and feel the mode switch as if it lost the suction then return when you have crested the hill. And some days it won't change modes at all.
Possibly bad check valves, minor leaks, or a combination of the two.
 
  #12  
Old 05-12-2018, 07:46 PM
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Just to double check, the flow of check valves should be to the intake, correct?
 
  #13  
Old 05-13-2018, 08:19 AM
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Flow to the intake it is. Thank you
 
  #14  
Old 07-03-2018, 06:12 PM
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how often does the hot/cold selector go out? no e don't work but I took off the actuator n the motor still works
 
  #15  
Old 07-03-2018, 10:09 PM
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It's the coupler between the motor, and the axle for the blend door that usually cracks. Do a search on 'heater treater".
 
  #16  
Old 07-04-2018, 09:03 AM
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no the actuator does not move when hooked to the truck and I try to switch it from hot to cold but if I remove the actuator and probe power to each of the tabs of the connector on the actuator it works. the plastic rod that connects to the actuator is not striped
 
  #17  
Old 07-04-2018, 09:16 AM
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So is the control not sending power to the actuator?
 

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