Inside ventilation stops when engine pulling hard...
Mountain Pass
Joined: Mar 2002
Posts: 227
Likes: 12
From: St Louis, MO
Hook the hand pump directly to the damper motor. When you pump it, you should see it's rod move. Once it moves as far as it can, you should be able to give it a couple more pumps and it should hold with no leak down.
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5th Wheeling
Joined: Jun 2016
Posts: 30
Likes: 0
Hopefully, it's as simple as the check valve, but if not, I have plenty of stuff to check, and now I know how to do it. Another thanks to everyone who has weighed in on this topic to help out with great suggestions on what could be at the root of the problem. There is no way I would have been able to find enough time to discover all the possibilities by myself. Forums like this are worth their weight in gold!
Fleet Mechanic
Joined: Apr 2003
Posts: 1,460
Likes: 6
From: Florida
you might try a cheap trick: a Cigar and smoke
watch this video: test vacuum leak with cigar - Bing video
watch this video: test vacuum leak with cigar - Bing video
FTE Community Team
Joined: Nov 2001
Posts: 1,837
Likes: 252
From: Oak Harbor, Washington
We've seen it all.
I've had two bad HVAC vacuum check valves over the years on my Aeros.
https://www.ford-trucks.com/forums/3...-controls.html
I've had two bad HVAC vacuum check valves over the years on my Aeros.
https://www.ford-trucks.com/forums/3...-controls.html
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