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Heater Flaps Leaking Air?
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BampaBus
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Joined: February 15, 2009
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Location: Florida
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PostPosted: Fri Jul 07, 2017 8:47 am    Post subject: Heater Flaps Leaking Air? Reply with quote

Hi. '73 Westy. I've recently noticed I have heated air flowing into the cab when moving, even when the heater is shut off. I've looked at the two flap boxes at the front end of the heat exchangers and cycled them. The action is fine. They open and close, no issue. The cables are not rusted up and holding them open, even a little. So I'm guessing something inside of one or both is not right.

Before i remove them and inspect, is the something I should look for? Any way to rebuild them so they seal better, assuming that's the issue?

It's summertime in Florida. I don't need extra heat! Thanks.
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busdaddy
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PostPosted: Fri Jul 07, 2017 9:00 am    Post subject: Re: Heater Flaps Leaking Air? Reply with quote

If there's obvious slack in the cables when they are closed then you'll have to find out why they are leaking, could be missing seal material on the discs, or a lump or bent area causing them to hang up or remain off thier seats.
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BampaBus
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PostPosted: Fri Jul 07, 2017 10:29 am    Post subject: Re: Heater Flaps Leaking Air? Reply with quote

Yes, slack on both. I guess I'll disassemble and tinker. Thanks.
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70Crew
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PostPosted: Fri Jul 07, 2017 1:15 pm    Post subject: Re: Heater Flaps Leaking Air? Reply with quote

I had a similar problem on a type 1 heat exchanger. The flap inside the heat exchanger was not closing all the way, even with a little slack in the cable. I don't remember exactly what I did but I was able to adjust is fairly easily, so that when the cable was slack, the flap was fully closed. That is the default operation - it is spring-loaded to close unless the lever is pulled. It seems like the base of that flap is attached to a pin and the connection point was press-fit rather than welded (mine was an aftermarket box).
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Wildthings
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PostPosted: Fri Jul 07, 2017 4:27 pm    Post subject: Re: Heater Flaps Leaking Air? Reply with quote

Assuming the metal parts of the flapper box are good but that the seal material has failed, you should be able to use one of my favorite tricks here. Rip the rest of the old seal off the face of the flapper disc. Block the flapper open and then smear an 1/8" thick layer of high temperature silicone onto the disc, let the silicone skin over very well but not set all the way through. Now gently let the flapper close against the silicon and let the silicone cure fully. You should now have a tight fitting seal that should last for years.

A test smear of silicone on some other surface will let you know how much the silicone has cured at any point in time.

If the metal of the flapper box is a rotten mess there are other ways to go about making a fix.
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