Re: IML: '58 A/C

["Steve B." <Imperial59@xxxxxxxxxxxxxxx>]

Ernie Stepney wrote:
> Hi Gang:
>
> Has anyone any experience with 134a in these units? I replaced all the 
> hoses, pressure and flow tested the evaporator and condenser, replaced 
> the receiver dryer and expansion valve with R134a compatible parts. 
> The cooling is poor even though the line from the expansion valve to 
> the evaporator is cold. Here’s the kicker, the compressor is so cold 
> that water is condensing on it.
>
> Being a modern G* tech I’m used to the compressor running hot as it 
> compresses the gas, am I missing something?
>
> Oh yeah the compressor is capable of over 300 psi on the high side 
> with the service valve accidentally left closed, oops. The sump is 
> filled with mineral oil to the correct level and I put 6 oz. of ester 
> oil in the gas side. I charged it with enough refrigerant to clear the 
> sight glass, like old For*s.
>
> Any ideas on this?
>
> Ernie and The Black Bitc_!!


Ernie:
I hate to give advice when I don't really know what I am talking 
about... Our cars have a "externally mounted bypass" (EPR) valve that is 
said to be tricky with 134a since 134a runs at different pressures than 
r12 did. If memory serves the advice from the way back machine was to 
disable the EPR or replace the compressor with a '60 or later RV2 
compressor as they no longer contained that piece.

Steve B.


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