Automotive Air Conditioning Information Forum (Archives)

Provided by

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

Pressure readings on aftermarket/homemade system HELP!

Runboy on Thu May 15, 2008 11:34 PM User is offline

Ok, having a little difficulty with a system I have put together. It seemed to be cooling great when first installed and sometimes still does. Leading me to believe that it may be an expansion valve problem. I have played around with the charge up and down but nothing seems to change the vent temps.

The system:
Nippondenso 10PO8E Compressor
Porsche 993 Condenser
Universal Underdash evaporator
Universal Drier with binary switch
Condenser fan is wired to run constant when the a/c is switched on due to the condenser being mounted in a remote location.

Ok, today was mid 90's and here are my pressures at idle

With these #'s I should be seeing fairly decent performance?
How would one go about checking an aftermarket universal expansion valve? It just doesn't seem to be getting as cold as it should right after the valve at the evaporator. Shouldn't it be almost frozen just like the low pressure side of an orifice tube?

Thanks to anyone who can contribute some info.

89' F-350 Crew Cab 7.3L Banks Turbo

2000 E-series Condenser, R134 Converted with Orange Orifice Tube

Chick on Fri May 16, 2008 7:06 AM User is offlineView users profile

Doesn't seem to be any wrong with the expansion valve in my opinion. If you're in the mid 90's, you hight side should be up over 200-250psi, but I admit I don't know about that system.. Seems undercharged right now..Just my opinion though...

Email: Chick


Freedoms just another word for nothing left to lose

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.