RE: IML: EPR vs. ETR Valve

["Damian Justice" <djust16@xxxxxxxxxxx>]

I just converted my "73 to 134.   It blew cold untill my evap coil developed 
a leak.  I used "conversion oil" that was supposed to be compatible with 
both refigerants.  Although not quite as cold as R-12, it cooled (removed 
the heat if you are a pro) very well.  I use alot of freon 12,22,and 134 in 
Saudi Arabia.  It IS important to flush the system and o-rings are 
recommended.  My evap failure was just from age, not conversion.  I used the 
stock expansion valve and it worked fine.  Otherwise, I used a stock system, 
and it cooled well at 90 degrees in Texas 5/7/07
d. justice
Full story soon


> From: Tim Durrer <tdkd99@xxxxxxxxx>
> Reply-To: mailing-list@xxxxxxxxxxxxxxxx
> To: Imperial Mailing List <mailing-list@xxxxxxxxxxxxxxxx>
> Subject: IML: EPR vs. ETR Valve
> Date: Sun, 6 May 2007 10:52:09 -0700 (PDT)
>
> Calling all brave ATCII folks!
>
> OK, I have my new aluminum servo and my plan is to
> next weekend install it on my '73 and check all the
> vacuum lines with the FSM. With a little luck, I hope
> to at least get the darn thing to come on. After that,
> I am sure I will need to add refrigerant to the
> system. I have reviewed all the e-mails in the list
> archives about the pros and cons to converting to
> R-134A and have to decided to convert it over to
> R-134A.
>
> One of the e-mails states it is necessary to remove
> the EPR valve because it is not calibrated to work
> properly with R-134A and will negatively effect the
> amount of cooling. The car he was referring to does
> not have ATCII and has a EPR valve in the back of the
> compressor which modulates the flow of freon to
> prevent evaporator core freeze ups. In ATCII cars, the
> valve used is called a ETR valve, which is
> electrically controlled by a switch in the core
> housing. The difference being it is normally fully
> open or fully closed.
>
> My question is: Do I leave it in or take it out and
> hope the expansion valve will keep the unit from
> freezing up? Has anyone converted a ATCII car to 134A
> and if so, what did you do and how did it perform?
>
> Thanks,
>
> Tim Durrer
> '73 Blue Sky
>
>
>
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