Dash / chassis air conditioner on FC

[Leroy Eckert]

Before I converted to R134 an a/c technician advised me that my expansion valve
was inop. My expansion valve is a major job to replace because I think the bus
was built around the valve and the evaporator. I did not change it.

Everything works fine after charging the system with R134 to 80% of R12 value.
I also changed the dryer and the compressor oil. I will see how it does over
the long term. I can always tear the bus apart later, if necessary.

Just reporting here. Please do not do what I do unless you are prepared for the
potential consequences.

I'm still wondering about the a/c tech.

Leroy Eckert
1990 WB-40"Smoke N Mirrors"
Niceville, FL



----- Original Message -----
From: Chuck Wheeler
To: WanderlodgeForum@yahoogroups.com
Sent: Friday, March 09, 2007 10:03 AM
Subject: RE: [WanderlodgeForum] Re: Dash / chassis air conditioner on FC


You are right about the Expansion Valve Mike, it has to be replaced. You
only want to charge a R134 system to about 80% of the quantity of R12. R134
does not have the tolerance that a R12 system does for over or under
charging and it takes a different amount than R12. We have found that at
about 80% the system will function a little weaker than a R12 at idle, and
equal to or better than a R12 at running rpm. Except for my bus, which
didn't work out, this applies to the cars and trucks we have done. The
hoses in our BB were not lined so I lost too much Freon through the hoses
and it was too much work to replace them. I also decided that I did not
want the power load on a 210NA.

- Chuck Wheeler -

82 FC 31 SB

Fort Worth, TX

_____

From: WanderlodgeForum@yahoogroups.com
[mailto:WanderlodgeForum@yahoogroups.com] On Behalf Of Mike Hohnstein
Sent: Friday, March 09, 2007 9:22 AM
To: WanderlodgeForum@yahoogroups.com
Subject: Re: [WanderlodgeForum] Re: Dash / chassis air conditioner on FC

134A likes more condenser, you can't have too much. I used the old hoses,
new blower motors and had to change the expansion valve, stuff got in it.
Flush every thing you want to reuse and do up a new EV. It will all be good.
MH
----- Original Message -----
From: Alan
To: WanderlodgeForum@
yahoogroups.com
Sent: Friday, March 09, 2007 8:47 AM
Subject: [WanderlodgeForum] Re: Dash / chassis air conditioner on FC

Thanks for your experiences and advice here! That really helps. I'm
going to try my luck with the existing hoses. I'll take it to a local
shop and see if they hold a vacuum and have them cleaned out. If that
looks good, i'll put on a new compressor and probably condensor, and
(hopefully) go happily down the road as cool as I want to be.

I did look into alternatives. There are aftermarket units that are
made for trucks and tractors that I could have used. They were
self-contained and the compressors would run off of 120v. After
talking to one of these manufactures (http://www.danhard.com) I decided
against it just because of capacity. The chassis one should put out
around 36,000btu. While even the largest 120v one would be 15,000 btu.

Thanks again,
Alan

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