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#1
08-24-2011, 02:37 PM
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R134a Refrigerant Temperature...need some A/C expertise
Hey all,
I have just gotten the '85's system recharged at a trustworthy indy shop. A/C blows cold and is working, blowing at ~50F at highway speed. However, aux fan does not turn on because the refrigerant temp sensor never sees the refrigerant temp rise above ~125F. (I tested the aux fan by shorting the temp switch. I also pulled the temp sensor that goes to the R/D and tested it in water. Turns on at about 125F. ) Temp Switch: http://catalog.peachparts.com/item.wws?sku=W0133-1628934&itempk=77021&mfr=ACM&weight=0.06 So my the R134a isn't getting over 125F after idling with the A/C on for several minutes - is this good? or Bad? Thanks! dd
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------------------------------- '85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit) '82 300D, 'Tex', 228k body / 170k engine ... summer car '83 300TD Cali Wagon 210k, wife's car 
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#2
08-24-2011, 03:24 PM
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sounds like you have too high a temp switch, and a very clean condenser coil.
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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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
08-24-2011, 05:18 PM
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what temp is the switch specified to open at?
__________________
------------------------------- '85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit) '82 300D, 'Tex', 228k body / 170k engine ... summer car '83 300TD Cali Wagon 210k, wife's car
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#4
08-24-2011, 09:14 PM
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I may be Wrong but i'll say. There's nothing wrong with cold air at the vents and low temp refrigerant. I'd bet that if you went on a long hot drive and idle in traffic for a while that fan would kick on. Or drive to texas.
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#5
08-24-2011, 11:21 PM
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I think the high temp switch is supposed to be replaced with a 115F model during a proper 134 conversion.
__________________
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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#6
08-25-2011, 12:05 AM
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Quote:
would generic ones exist at a mcparts store? the threads on the old switch are stuck in the R/D (thats another thread) so Im not opposed to JB welding a lower temp generic switch in.
__________________
------------------------------- '85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit) '82 300D, 'Tex', 228k body / 170k engine ... summer car '83 300TD Cali Wagon 210k, wife's car
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