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Old 04-01-2015, 03:44 PM   #1
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Winnebago Brave ductwork stuck on defrost only

Need help please. When I turn on my Winnebago Brave and then turn on the vent for cold air or air conditioning, the air only blows thru the defrost vents or ductwork. I turn the dial to the spot where it should blow right at you or at your feet and it does not seem to work, it only blows out the defrost vents. I'll take it in if I have to but I would like to try and fix myself if possible. Thanks for any advice to a new RV owner. It's a 2003 Winnebago Brave (Ford Chassis) 34D.
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Old 04-01-2015, 04:53 PM   #2
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My Tradewinds has a small vacuum pump that opens and closes dampers changing where the air goes. When the fuse blows it goes to default and opens the defrost damper for safety to keep the windshield clear.Since the fuse always blows I just ziptied the heater damper open to get heat. Not sure if yours is the same.
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Old 04-01-2015, 06:18 PM   #3
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You have a major leak in your vacuum.

This article will get you started. There are also some known hoses and fittings that deteriorate and leak on the F53 chassis.

Are you comfortable looking under the hood? if so look at these items, rub them with your fingers, if they leave a black powdery residue, they need to be replaced.
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1999 Fleetwood Southwind 35S (Ford F53 6.8L V10) - Toad 2003 Saturn Vue.
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It won't do MACH 2, but I can get a sandwich and take a pee.
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Old 04-01-2015, 09:03 PM   #4
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Hey thanks a bunch. Will reread and try and see if your comment applies.


WAITER21: Awesome. I can change those out if needed. My neighbor is a certified mechanic and he is very gracious about helping. thnx!
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Old 04-02-2015, 05:12 AM   #5
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OK, Not sure how the winny is laid out, but the F53 chassis is the same as mine.

I'm betting you will find a cracked, broken, or disconnected vacuum hose.

If your temp control is the same as mine (Evans tempcon) its easy to troubleshoot.
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1999 Fleetwood Southwind 35S (Ford F53 6.8L V10) - Toad 2003 Saturn Vue.
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It won't do MACH 2, but I can get a sandwich and take a pee.
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Old 04-02-2015, 08:57 AM   #6
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The most likely problem is that the vacuum hose has been disconnected from the vacuum reservoir under the hood. There's a sphere shaped vacuum reservoir almost in the center of the hood opening at the top of the opening about a foot inside the engine compartment. It's hard to see unless you stick your head in the compartment and look up. It should have 2 hoses going to it. One from the engine and another (blue one) going to the heater controls.

The blue hose is routed near the oil dipstick and often gets pulled off the reservoir port when someone checks the oil.

There's also a second much larger rectangular shaped reservoir below the right headlight. From time to time I've seen the vacuum hose connector come loose on this reservoir as well.

A vacuum leak from either of these reservoirs will be small enough that you'll never notice any performance problems or set a "check engine" light. I would check these two reservoirs before tearing anything apart.
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Old 04-02-2015, 09:25 AM   #7
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Hikerdogs - Yup, that's what was wrong with mine - hose pulled off of round accumulator bottle.

Heater A/C blows Defrost mode, regardless of switch setting | 2001 Coachmen Mirada 300QB
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