IML: EPR vs. ETR Valve

[Tim Durrer <tdkd99@xxxxxxxxx>]

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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