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  #1  
Old 08-24-2011, 03:37 PM
dieseldan44's Avatar
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Question 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  
Old 08-24-2011, 04:24 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
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Location: Mount Holly, NC
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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
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  #3  
Old 08-24-2011, 06:18 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  
Old 08-24-2011, 10:14 PM
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Location: Carolina
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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  
Old 08-25-2011, 12:21 AM
vstech's Avatar
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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  
Old 08-25-2011, 01:05 AM
dieseldan44's Avatar
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Quote:
Originally Posted by vstech View Post
I think the high temp switch is supposed to be replaced with a 115F model during a proper 134 conversion.
any idea of a part # for this?

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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