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What year E150 ? Manual or automatic HVAC ? What door isn't switching ? Mode door , temp. door ? Some ford's have a valve under the hood hooked to heater hoses called hot water valve , allow hot coolant to go through the heater core . Ford Explorer 1992 heater control valve install Explorer E150 doesn't matter ford used on all there vehicles ! Some are vacuum controlled others are controlled by a cable !
Selection lever does not move to AC vent or floor vent only to the defrost. AC compressor does not kick in when AC is selected.
Vacuum level is at 18 instead of 23.
Any suggestions.
I have the same problem, when running the air conditioning the front vents will blow hot air. I have not removed the dashboard yet, but I think that the air damper is stuck in the open position. It seemed like a heater core valve problem, but I am pretty sure it is a damper under the dashboard. Now however, I am finally getting some cool air out of the airconditioning vents, but when winter comes, I am afraid I will struggle getting heat again.
Air diverter doors are vacuum operated. This problem is generally due to broken vacuum line. Start tracing the vacuum line from entry at the firewall back to engine. Likely goes through some type of canister, especially ball shaped and maybe through a vacuum manifold where several lines attach. Check for leak along all attaching lines all the way to vacuum source at engine manifold. If no problem found then check line from firewall to temp/climate control switches under dashboard and from switch to actuators. Can sometimes be difficult to trace but never impossible. Good luck!
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