Keeping cold air up fron

[Tom Warner]

I keep hearing that chassis airs are not producing enough cold air
for owners of forward controls or for that matter thje PTs. Many
owners have taken the compressors and condensers out entirely.

I rebuilt the chassis air on the 1982 FC35 that I had including a
compressor, air drier, evaporator fans and rewiring the circuits
supplying voltage to the condenser and evaporator fans. Also
recharged with R134a. Blew air at 39 degrees and the fans due to the
increased voltage available to the fans blew what seemed to be twice
as much air.. It produces more then enough cold air for the front of
the bus even on the hottest days. The A/C compressor is a 10 cubic
inch unit capable of providing a maximum of approx 47,000 BTU with
R134a at the speed the compressor is turning, although the condenser
size is limiting that some. If you need more air you can add another
evaporator inside and a larger condenser on top. Remember your roof
airs only produce a maximum of 15,000 Btus each.

The main thing restricting the volume of cold air produced by the
chassis A/C is voltage reaching the condenser and evaporator fans.
Bluebird had the voltage routed thru the dash switches (same with the
head lights) and the remoting of these switches using Bosch relays in
the top solved this problem.

tom warner
Vernon Center,NY
1985 PT 40 (its chassis air is next)



At 04:57 PM 7/25/2006, you wrote:

>Just made a trip in our 7731FC and found a way to keep cooler than
>before. We use the front roof air as the dash air doesnt do anything.
>This trip we bought a clear shower curtain and used expanding window
>curtain rods to hold it in place just in front of the hinge to the
>bathroom door. We have a closet just across. Worked great to keep cold
>air up there with us and we could see out the back window to keep watch
>on the boat we were pulling. Hope this works for others as well.
>
>


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