Advice
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New User
Joined: May 2015
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From: Delta, B.c.
Advice
Hello, my truck has heat only coming through the defrost only, I originally thought it may be the control panel, so I ordered a replacement, then under more research I heard it could be the vacuum activated locking solenoid, and was recommended I change it out! Can I have your feed back? Why would this have anything to do with my air flow?
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
The vacuum pump is used for the controls to move from floor to vent to defrost and close the heater valve.
Could be anything that requires a vacuum from the pump to the hubs, looses vacuum and switches to defrost, that's the defaulted position.
Could be anything that requires a vacuum from the pump to the hubs, looses vacuum and switches to defrost, that's the defaulted position.
Fleet Owner
Joined: Nov 2003
Posts: 27,901
Likes: 3,617
Edit - too slow, oh well!
The climate control flow valves in the dash are vacuum operated.
It may not be the solenoid, you could have a vacuum leak.
There is a small plastic vacuum line on the heater flow control valve under the hood at the firewall (on the passenger side). It may have come off, or you may have another leak as Randy mentioned above.
https://www.ford-trucks.com/g/album/812039
The climate control flow valves in the dash are vacuum operated.
It may not be the solenoid, you could have a vacuum leak.
There is a small plastic vacuum line on the heater flow control valve under the hood at the firewall (on the passenger side). It may have come off, or you may have another leak as Randy mentioned above.
https://www.ford-trucks.com/g/album/812039
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