2000 ford F150
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1st Gear
Joined: May 2025
Posts: 1
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From: Tennessee
2000 ford F150
I have a 4.2 6 cylinder 2 door truck. in both heat & AC mode when I accelerate the duct damper closes. When I release the gas it opens again and returns to its setting.
No problem with the fan operation, just the damper opening & closing.
No problem with the fan operation, just the damper opening & closing.
Fleet Mechanic
Joined: Jun 2023
Posts: 1,394
Likes: 384
From: WA
This video might help. At about 2:00 when he's talking about vacuum lines you can see a green and white object. I think that is the check valve. Your problem sounds like a check valve that is not working.
Fleet Mechanic
Joined: Jul 2019
Posts: 1,323
Likes: 314
Possibly the check valve, but better chance that you have some cracked hoses or the rubber on their ends. Those cracks inhale air when the hoses shift just right. Eventually, you’ll be where I am at and be stuck on defrost totally. Gonna dig deeper one of these weekends.
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Al Yelton
1997 - 2003 F150
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Oct 16, 2021 06:54 AM
