AC Question

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Mar 25, 2021 | 10:08 AM

off2fsh

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Trailering

Joined: Oct 2019

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AC Question

Turned the AC on a few days ago, I noticed it starts blowing from the defroster for a bit and then gradually starts blowing out the vents... Selector Switch?????
Also when I accelerate the air blows considerably less???? Vacuum leak maybe?????
Anyone experience this before???

Thanks in Advance

Mar 25, 2021 | 10:12 AM

WE3ZS

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Joined: Jul 2010

Posts: 12,055

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From: Media PA

For safety reasons the system is designed to default to the defrost position if there is a vacuum failure (system controlled by vacuum), so it sounds like you may have a vacuum leak someplace that's affecting the vent selector operation. Is this a 4X4? If so the vacuum switch for the front hubs is a very common failure point for the vacuum system, you can cap off the inlet line to it to test the operation of the HVAC with it out of the loop.