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#1
03-31-2016, 10:02 AM
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85 w123 AC pressure switch for r134a conversion?
Hi,
My 85 300d has been previously converted to r134a. I am in the process of repairing a leak and hope to fill the system soon. Does anyone know which pressure switch part number/style I should order (not going to spend the $$$ on the genuine part)? I have no idea if the switch was swapped when the car was converted originally, so I didnt want to risk replacing it with the same PN that was originally used for r12. Thanks! 
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#4
04-01-2016, 10:15 AM
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the pressure switch makes no difference, it's only there for a low pressure shutout condition, and 134/12 are very similar at the low end.
it's the TEMP switch that needs to be changed to get the aux fan running at a lower temp for 134.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#5
04-01-2016, 10:25 AM
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Awesome, thank you.
So: part 000-820-80-10 ? Also - which temperature rating? Depending on how I search Pelican Parts, I either get one that is unmarked - or one that says 62c - though with the same part number: 000-820-80-10-MY-INT Sorry for the 20 questions... Last edited by Demothen; 04-01-2016 at 10:35 AM.
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#7
04-01-2016, 04:29 PM
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Not sure the purpose of the low-pressure switching, it mainly just frustrates you when trying to charge the system. I guess they didn't want owners running the AC needlessly if not enough refrigerant to work. The high-pressure cut-off is to protect the AC clutch from slipping and burning up. If you never over-fill the refrigerant and don't live in a real hot place, and don't let your condenser or evaporator get blocked w/ crud, it should never be needed. It didn't help in my 2002 T&C where the clutch slipped on a 108 F day (after I added a little refrigerant and might have pushed it over the edge). It sprayed molten plastic all around the compressor. Most all vehicles have a low/high pressure switch on the AC high-side.
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1984 & 1985 CA 300D's 1964 & 65 Mopar's - Valiant, Dart, Newport 1996 & 2002 Chrysler minivans
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