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help with 73 chrysler ERP valve

98audiA4 on Wed July 14, 2010 10:35 PM User is offline

Year: 1973
Make: plymouth
Engine Size: 318
Refrigerant Type: r134a
Ambient Temp: 85
Country of Origin: United States

Hi, i'm helping my dad out with his 73 plymouth that had a half assed conversion done on it. according to him it was suggested by some other classic car guys that the ERP valve needed removed and that was done as well as a flush of everything, a new compressor, new drier and an r134a charge. I don't remember pressures because I haven't touch it iin a long time but the compressor does run and if I remember correctly the low side never gets very low. I know there's multiple low side ports on the compressor, i don't remember which i was using but i think it's the right one.

So i'm here looking for some guidance. Which low pressure port on the RV2 compressor am I hooking up to and should this ERP valve be put back into the system? It looks like its adjustable but I have no idea where it was set so if someone could give me a rough idea of where to set it?? all the way closed? open? 2/3 open?

I appreciate any help you can give me
here are a few pics of the valve (i know it needs cleaned up, its been sitting on a shelf :\



Dougflas on Thu July 15, 2010 5:55 AM User is offline

Epr valve should show about 7 to 11 psi less on 3rd gauge. Yours is in sad shape. You might try soaking it in refrigerant oil. I have an EPR tester if you need it tested out of the vehicle.

98audiA4 on Thu July 15, 2010 8:03 AM User is offline

by testing it would you be able to pre-set it for me?

ice-n-tropics on Thu July 15, 2010 10:13 AM User is offline

Quote
Originally posted by: Dougflas
Epr valve should show about 7 to 11 psi less on 3rd gauge. Yours is in sad shape. You might try soaking it in refrigerant oil. I have an EPR tester if you need it tested out of the vehicle.

Doug,
What's the story on your EPR tester?
hotrodac


-------------------------
Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod

Dougflas on Thu July 15, 2010 4:37 PM User is offline

The tester is similiar to the POA tester. One would use shop air to verify the regulated pressure. Some EPR valves are able to adjust...some not. I will do a write up on troubleshooting EPR systems tonight if I can get the time. I'll then email it to Tim and see if he'll post it on the tips and proceedure section.

Dougflas on Thu July 15, 2010 4:40 PM User is offline

Quote
Originally posted by: 98audiA4
by testing it would you be able to pre-set it for me?

Yes that one appears that it can be adjusted. I'll have to do some research on the EPR adjustment. Give me a few days.

ice-n-tropics on Thu July 15, 2010 4:45 PM User is offline

Thanks Doug,
How long have you been messing w/ mobil A/C and how did you get started?
hotrodac

-------------------------
Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod

Dougflas on Thu July 15, 2010 5:35 PM User is offline

Been in it since 1973 as a side line on and off.





Edited: Thu July 15, 2010 at 6:07 PM by Automotive Air Conditioning Information Moderator

ice-n-tropics on Thu July 15, 2010 9:16 PM User is offline

Thanks Doug,
It all makes sense.
In 1973 I was working for MARK IV Air Conditioning and they assigned me to Ford of Europe in South Ockington, England. Therefore, I did a lot of study/tests on Ford HVAC, Granada etc. Testing A/C while driving on the left side of the road was a real Hoot.
MARK IV had adjustable STVs called "Selectrol" valve which mounted on the evaporator and the "Robotrol" mounted on the compressor and were invented by Orville Mitchell Sr.
hotrodac

-------------------------
Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod

Edited: Fri July 16, 2010 at 10:48 AM by ice-n-tropics

Dougflas on Thu July 15, 2010 9:26 PM User is offline

Quote
Originally posted by: ice-n-tropics
Thanks Doug,



Testing A/C while driving on the left side of the road was a real Hoot.

hotrodac

In my younger days, I was driving on the left side of the road too but the cops didn't like that here. :-)

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