Black plastic pipe question

wolfej1 · Posted: Tue Oct 03, 2006 6:25 pm Post subject: Black plastic pipe question

Now I am getting pretty anal I think.... Confused

The black plastic pipes in the rear of the engine that send air to the heat exchangers are hot when I checked them after a drive.

Is this OK? I would think they would be relatively cool due to moving cool air into the system.

Thanks

wolfej1 · Posted: Thu Oct 05, 2006 8:13 am Post subject:

Wondering if this has anything to do with my heat not working well?

Randy in Maine · Posted: Thu Oct 05, 2006 8:46 am Post subject:

See if you can remove those hoses and shove an air compressor blow gun in the front of the bus and blow out some of the crap that gets in there.

wolfej1 · Posted: Thu Oct 05, 2006 8:53 am Post subject:

should those plastic pipes be getting hot though?

Randy in Maine · Posted: Thu Oct 05, 2006 1:23 pm Post subject:

Yes as the hot air is trying to move forward in the bus.

Wildthings · Samba Member Joined: March 13, 2005 Posts: 50352

Are you talking about the two flexible hoses that run from the electric fan down and through the tin to the heater boxes? The fan should run when you have the heat on full and the hoses should not be particuarly hot. If the fan is not running you should not have much back flow through the hoses, but I am sure there is a little so the temperature might creep up. If the electric fan is missing, the hoses are loose, or the outlet check valves on the fan don't work you will get a high rate of back flow through the hoses and little heat to the front.

wolfej1 · Posted: Thu Oct 05, 2006 7:02 pm Post subject:

I am talking about the black rigid plastic tubes that are in the rear of the engine compartment and go thru the tin to the heat exchangers.

Wildthings · Samba Member Joined: March 13, 2005 Posts: 50352

I can not picture the rigid hoses you are talking about. What year is your bus? Is it a Type 1 or Type 4 engine?

The only rigid plastic I can think of are where the hoses from the electric fan attach. If the fan is missing you will not be getting much of any heat up front as you will be pumping all your air into the engine compartment.

scottcollins72 · Posted: Thu Oct 05, 2006 9:55 pm Post subject:

He is talking about the ducts that run from the alternator to the heat exchangers I believe. Those aren't what are causing your lack of heat. Underneath the van where the engine attaches to the transmission, there should be two heater valves. Most of the time they are rusted to submission and won't do anything. Can't remember who posted a diagram of how it all works but somebody did. Replace the valves and check all the hoses and duct work in the area. The fan that Wildthings is talking about is underneath the black metal cover under the rear seat. After that it's all about the gas heater under your butt controlled by the green knob that says temp +-. If you require additional help I'll post some pics tomorrow.

Cheers
Scott.

wolfej1 · Posted: Fri Oct 06, 2006 4:43 am Post subject:

Wildthings · Samba Member Joined: March 13, 2005 Posts: 50352

Oops, I was thinking of the heating system in a bay window van instead of the one in a Vanagon, sorry for the confusion. The only air cooled Vanagon I have around doesn't run so I do not know how hot the black pipes should be, but I would guess at about the same temperature as the fan shroud.

bucko · Posted: Fri Oct 06, 2006 9:37 am Post subject:

"He is talking about the ducts that run from the alternator to the heat exchangers I believe"

Now I'm confused. What ducts are there that connect to the alternator?

wolfej1 · Posted: Fri Oct 06, 2006 9:43 am Post subject:


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