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Old 03-08-2015, 09:37 AM   #1
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Join Date: Oct 2009
Posts: 5
2006 Seabreeze 8311 dash vents

When travelling up hill the dash vents quit blowing air, then when going down hill or under light throttle loads the dash vents will work properly.
It acts as though there is a vacuum leak somewhere. Any suggestions
would be greatly appreciated.

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Old 03-08-2015, 09:55 AM   #2
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National RV Owners Club
Join Date: Jan 2009
Posts: 100
If it's a ford F53 V10 That is just how it works. Mine does the same thing. I understand why they want to cut out the AC going uphill to save power but I don't understand why they cut out the fan (which is just a 12V blower). I've been unsuccessful finding a solution. I be interested if there is any solution.

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Old 03-08-2015, 10:24 AM   #3
Join Date: Feb 2015
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Have you seen this?


Mine does the same thing but. Have been unable to find the new canister.
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Old 03-08-2015, 10:28 AM   #4
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Join Date: Jul 2014
Posts: 18,123
First, there should be a check valve, in line between the engine vacuum source and the black, sometimes egg shaped, vacuum tank.

If the check valve is bad, the vacuum will disappear, under low vacuum, heavy load conditions.

Next step, would be to get to each vacuum diaphragm, and check for leakage.

Suck each one down, with vacuum pump or mouth ( stick tongue over end of hose to seal ), and see if one, does not hold.

Sometimes you can hear the hissing sound of a leak.

Good luck
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Old 03-09-2015, 08:25 AM   #5
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Join Date: Oct 2009
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I have found 1 vacuum diaphragm under a panel , passenger side just above the floor that is attached to the firewall. Cannot get to all the screws that attaches the panel, but have been able to pull the panel out far enough to get a peek at the vacuum diaphragm. It has 2 vacuum lines attached. I will pull the engine cover this week and look for the vacuum source.
We've had this RV since new. The vents (air) has never quit under any load until last summer. There is a box under the dash that the vacuum device is attached to. I think this is an air handler of some kind. I will continue to investigate and will update this post.
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dash, seabreeze, vent

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