Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 04-09-2003, 01:16 AM
Registered User
Join Date: Mar 2003
Location: walnut ca.
Posts: 16
expansion valve leak?

just finished head gasket replacement, [many thanks to those that replied to my post] now will start working on A/C system, I have added a can of r12, cooled slightly for a couple of weeks and now 0 cooling ,compressor not engaging. I am hoping its not the evaporator leaking but noticed moisture on expansion valve {firewall side] looks like a/c oil,I also noticed the lines coming out of the firewall are copper colored, would like to find out if this has been an updated part ? hopefully its just a leaking H VALVE. I would apreciate any help or advice
Reply With Quote
Old 04-09-2003, 06:54 AM
Posts: n/a
It's always helpful for us to know the year and model that you are working on.

From your description, it SOUNDS like you're working on a 124 car. That said, oil around the seem of the expansion valve could be a clue, but not enough evidence to know for sure that this is where your leak really is.

Given that this is an R12 system, according to your comment about adding R12, AND the fact that it may have lost a can in only a few weeks, you don't want to look for the leak with dye because you would lose the necessary R12 to the atmosphere. This is, of course, harmful to the atmosphere PLUS the stuff is not cheap.

I would suggest jumping the low pressure switch to ensure that the compressor will kick in. Only leave it jumped long enough to varify that the clutch will kick in. Once you do that, then you can consider that the electrical circuits are probably okay.

Once you have determined that, I would suggest that you find a shop to look for the leak. They have several ways of doing this that will be less expensive than losing a charge of R12. Once they tell you what component is leaking, you can then replace the component yourself and then take it back to the shop for them to evacuate and charge unless you have a vacuum pump and manifold gauges to use for this job.

Good luck,
Reply With Quote
Old 04-09-2003, 10:13 AM
Registered User
Join Date: Jun 2000
Location: Plano, TX
Posts: 2,476
I actually asked the same question regarding copper tubing on the evaporator. Alas, this is the factory evaporator. It uses copper tubing bonded to an aluminum core. You can easily see the evaporator by shining a flashlight into the center vents while running the a/c.

- JimY
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 05:40 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page