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Old 03-04-2016, 03:23 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 38,610
AC question

My 39 studie is coming along. My builder says he needs an AC low pressure shut off valve....would that be the one that goes on the dryer or the other one?

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #2  
Old 03-04-2016, 03:34 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
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Dryer.
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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  
Old 03-04-2016, 03:34 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,835
I'm not aware of any other cutoff on our cars.
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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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  #4  
Old 03-04-2016, 03:40 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 38,610
There is another listed above in parts for sale described only as a 400 psi valve.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #5  
Old 03-05-2016, 05:09 PM
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Join Date: Aug 2010
Location: Sacramento, CA
Posts: 3,115
Many of these switches have both low and high pressure limits. That is true of the switch in my 1984 & 85 300D, which wouldn't be a bad choice for you since it has simply two 1/4" spade connectors ("57 terminal"), though might be smarter to use a Chevy or Toyota PN. The switch-off levels aren't particularly critical, say <10 psig or >300 psig. When charging the system, you usually want to bypass the switch so the compressor will run, though sometimes just adding the 1st can gets it above the 10 psig cut-off. When I put a Sanden compressor in my 1985 300D, I added a little "pressure relief valve" ($8 ebay) on the head (rather than just plug that port). I recall it pops ~300 psig. The factory Harrison R4 compressors have a cir-clipped port, but I think it is just a plug in our cars. I recall someone said that GM put a PRV there in their cars that used an R4. I think the EPA frowns on any PRV today (releasing any refrigerant ist verbotim), though the HC refrigerant I use is no worse for the earth than a cow fart.

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