I can not find the leak on my A/C 2002 suburban - Chevrolet Forum - Chevy Enthusiasts Forums

Notices
Tahoe & Suburban The power, space, and brutal towing ability make the Tahoe and its longer sibling, the Suburban, arguably the best full size SUV's on the market today.

2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

I can not find the leak on my A/C 2002 suburban

Old March 7th, 2019, 1:52 PM
  #1  
CF Beginner
Thread Starter
 
Join Date: Oct 2009
Location: East Midlands UK
Posts: 19
Default I can not find the leak on my A/C 2002 suburban

2002 suburban 3.5
Gustheiceman is offline  
Old March 7th, 2019, 1:59 PM
  #2  
CF Junior Member
 
Cusser's Avatar
 
Join Date: Dec 2018
Posts: 94
Default

Refrigerant leak detection can be tricky. Typically a combination of visual observation, UV dye/UV light & goggles, electronic sniffer, even soap bubbles. If you have rear AC, then more places to leak.

In other words, I recommend having a real AC shop diagnose the leak (specify that); then you can determine if you have the skills and equipment to repair it yourself.
Cusser is offline  
Old March 8th, 2019, 7:39 AM
  #3  
CF Monarch
 
tech2's Avatar
 
Join Date: Mar 2011
Posts: 6,489
Default

the only thing a diyer can do is charge the system and spray dishsoap/water solution on all the parts...hopefully, the leak is big enough to detect bubbles.
tech2 is offline  
Old March 8th, 2019, 7:40 AM
  #4  
CF Junior Member
 
Cusser's Avatar
 
Join Date: Dec 2018
Posts: 94
Default

I myself also have UV light & goggles and an electronic sniff tool.
Cusser is offline  
Old March 15th, 2019, 9:23 AM
  #5  
CF Junior Member
 
Join Date: Dec 2013
Posts: 75
Default AC leak

Originally Posted by Gustheiceman View Post
2002 suburban 3.5
I have a mechanic that does any work that I am unable to do myself on my '01, and without the tools, leaky AC is one of them. Yet despite the fact that he does so much of this work, he struggled to locate the leak on my vehicle. It ended up being on the valve on the high pressure side, but with a leak so slow that I'd be well into winter season before it would drain the system.
subfan597 is offline  
Old March 15th, 2019, 9:41 AM
  #6  
CF Junior Member
 
Cusser's Avatar
 
Join Date: Dec 2018
Posts: 94
Default

You mean the high side service valve? The cap really does the real part of the seal there.

Or do you mean the rear expansion valve (for the rear AC) ??? That's tough to access.
Cusser is offline  
Old March 15th, 2019, 2:18 PM
  #7  
Administrator
 
73shark's Avatar
 
Join Date: Apr 2006
Location: KC, MO area
Posts: 9,615
Default

The Schrader valve, not the cap, is what maintains the pressure in the A/C system. Saying the cap does it is like saying the plastic cap on your valve stems is what holds the pressure in your tires.
73shark is offline  
Old March 15th, 2019, 2:24 PM
  #8  
CF Junior Member
 
Cusser's Avatar
 
Join Date: Dec 2018
Posts: 94
Default

Originally Posted by 73shark View Post
The Schrader valve, not the cap, is what maintains the pressure in the A/C system.
Most service valves leak a little. The AC experts on the dedicated AC forums say the cap is essential to help make a good seal. If you're an AC expert yourself, you may dispute and/or argue directly with them on their forums.

And most AC shraeder type valves are replaceable, and many can be switched out without losing refrigerant using the correct special tool. I haven't done this, but the experts say this, and I've seen such tools.


Originally Posted by 73shark View Post
Saying the cap does it is like saying the plastic cap on your valve stems is what holds the pressure in your tires.
That's why I use metal tire valve caps on vehicle tires and my bicycle tires; they have with a good rubber seal inside them and seal way better than the plastic dust caps..
Cusser is offline  
Old March 15th, 2019, 9:40 PM
  #9  
Administrator
 
73shark's Avatar
 
Join Date: Apr 2006
Location: KC, MO area
Posts: 9,615
Default

Not an AC expert by any means but I'm pretty sure that those dinky little plastic caps on the R134a systems will not withstand 300 PSI. The nice metal caps with o-ring seals on R12 systems may prevent a leaky Schrader valve from leaking.
73shark is offline  
Old March 19th, 2019, 2:46 PM
  #10  
Administrator
 
in2pro's Avatar
 
Join Date: Apr 2008
Location: Austin, Texas
Posts: 7,504
Default

My 2007 Tahoe had a leak at the low side charge port, the schrader valve must have gotten debris in it when I checked the charge. I was going to replace the valve BUT the 07's do not have a replaceable one WITHOUT evacuating the system.
I ended up putting some PAG oil in the valve and attaching the gauge set and I guess that allowed what ever was holding it open to get displaced as it has done fine since. This is probably a case of leave well enough alone, if it ain't broke don't fix it.. (I thought I was being pro-active by checking it, turns out I created the problem that didn't previously exists)
in2pro is offline  

Thread Tools
Search this Thread
Sponsors

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: