Re: IML: '58 A/C

["john sadowski" <jsadowski@xxxxxxx>]

Its been a while since I've had a real good look under the hood of a 58, but 
I'm guessing that the heater box probably has the bypass door in it like the 
60-66 does. If the door doesn't move to the cool position, you won't get 
much cooling. Also, if the heater valve doesn't close completely, you are 
letting hot coolant come in with the A/C. I would suspect one or both of 
those problems.
John
----- Original Message ----- 
From: "Steve B." <Imperial59@xxxxxxxxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Saturday, July 15, 2006 6:38 PM
Subject: Re: IML: '58 A/C


> 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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