Automotive Air Conditioning Information Forum (Archives)

Provided by www.ACkits.com

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

Archive Home

Search Auto AC Forum Archives

still cannot find the leak

mrvmax on Mon June 09, 2008 1:42 PM User is offline

Year: 1996
Make: Ford F350
Engine Size: 7.3
Country of Origin: United States

I pressured the system up to 120 psi and soaped down the entire system (I even opened up the evap to check that). The system holds pressure but will not hold vacuum. The only thing close I can find is one hose is cracked. I decided to replace the aluminum line from the evap to the condenser and teh main rubber hose from the condenser to the compressor to the condenser. If that doesn't do it I'll replace the condenser, evap and drier then the whole system will be new except the compressor. Where would an FS10 compressor leak at? Although I soaped the entire compressor down would it be leaking from anywhere besides the connections to the hose? I' ve even checked the pressure switches and relief valve on the compressor.

TRB on Mon June 09, 2008 3:46 PM User is offlineView users profile

Maybe your gauges are leaking?

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

mrvmax on Mon June 09, 2008 5:16 PM User is offline

I isolated the gauges under vacuum yesterday and removed from the truck. The gauges were still showing vacuum this morning.

brickmason on Mon June 09, 2008 9:06 PM User is offline

Before you go replacing everything except the compressor, remember that the compressor shaft seal could be leaking under vacuum but not under pressure.

-------------------------
Just another brick in the wall

Had a little mule I fed him castor oil and every time he jumped the fence he fertilized the soil

mrvmax on Mon June 09, 2008 9:09 PM User is offline

How can I tell if that is bad?

brickmason on Mon June 09, 2008 9:14 PM User is offline

The only way to know for sure is to isolate the compressor with separate fittings which are made up to specially attach your gauges to.

The same being said for the condenser and evaporator also.

-------------------------
Just another brick in the wall

Had a little mule I fed him castor oil and every time he jumped the fence he fertilized the soil

mrvmax on Mon June 09, 2008 9:44 PM User is offline

Kind of a bad situation since I have no way of telling what is bad. I replaced both hoses today since they were fairly old anyway but it didn't help. I suppose the most likely would be the compressor since it can leak under vacuum but not under pressure. I would think that I would be able to see the leak on the evap and condensor when I soaped them down.
The system had UV dye in it before it went bad. If I pulled the compressor clutch I should see dye on the shaft if I have a leak there, correct?

Edited: Mon June 09, 2008 at 10:01 PM by mrvmax

TRB on Mon June 09, 2008 10:06 PM User is offlineView users profile

There are system that do not like holding a vacuum. How long are you expecting it to hold a vacuum?

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

mrvmax on Mon June 09, 2008 10:14 PM User is offline

Once I isolate the vacuum pump at the gauges the vacuum starts dropping immediately. I would expect it to hold vacuum for at least 10 minutes. It will not even hold for one minute.

TRB on Mon June 09, 2008 10:25 PM User is offlineView users profile

That a large enough leak that you are missing something. With the 120PSI you should have even been able to hear it.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

mrvmax on Tue June 10, 2008 6:09 AM User is offline

That is what I was thinking but I have soaped everything down at 120 psi and I do not get bubbles anywhere. I even checked the pressure switches and relief valve on teh compresser. Any other ideas?

TRB on Tue June 10, 2008 11:24 AM User is offlineView users profile

Maybe use an electric leak detector such as TEK-Mate

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

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.