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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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.
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.