2003 four winds infintity stuck on defrost

[john2364]

So something is going on with the air blender. at some point I am going to address it. Does anyone know know if this is a pneumatic system or electronic actuator in older four-winds class As? I suspect that its set up the same way as the hurricanes of the same year.


2003 four winds infinity on a f53.

[Beau388]

Originally Posted by john2364

So something is going on with the air blender. at some point I am going to address it. Does anyone know know if this is a pneumatic system or electronic actuator in older four-winds class As? I suspect that its set up the same way as the hurricanes of the same year.


2003 four winds infinity on a f53.

Traditionally Thor Industries class As use dash units supplied by Evans Tempcon. The ones in my RV are and are vacuum operated. The default for all vacuum controlled air doors is defrost. I suspect you have a vacuum leak.

[john2364]

Originally Posted by Beau388

Traditionally Thor Industries class As use dash units supplied by Evans Tempcon. The ones in my RV are and are vacuum operated. The default for all vacuum controlled air doors is defrost. I suspect you have a vacuum leak.

Awesome, I have not worked on one of these before. Do you know if there are common leak points?

[Beau388]

Originally Posted by john2364

Awesome, I have not worked on one of these before. Do you know if there are common leak points?

Usually at the tubing ends at the switch or the diversion door's vacuum motor. Check first to see if the dash switch's control has engine vacuum. If no engine vacuum look at the engine manifold connection. It can melt if air flow across the top of the manifold is restricted.