[W126 Coupe] FW: a/c problems

[Hugh MacGregor]

Hi Dick
 
Thanks for your input. I'm ordering a new pressure switch and should have it installed in a few days. Will keep you posted.
 
Thanks again
 
Hugh MacGregor



Date: Sat, 26 Jul 2008 10:27:46 -0400From: dick.spellman at gmail.comTo: mbcoupes at mbcoupes.comSubject: Re: [W126 Coupe] FW: a/c problems
Hi Hugh,Take the two spade lugs going to the r/d pressure switch and jumper them.  These do not operate the aux fan, that would be the fan limit switch you jumped from what you describe.The KLIMA is fine from your posting.If the compressor kicks in with the correct wires jumped on the r/d, please check your pressures once again to be certain they are within range.  Low should be 30-45 depending on your air temp near the condenser when testing and high should be around 160-175.Report any noise or grumbling with compressor running as this may be a sign of low PAG 150 oil assuming you are talking about a Nippondenso compressor.You say pressures were good, I assume these were static pressures you were reading where the compressor was not active?In any event, it's either low pressure or the r/d pressure switch is likely bad.Last item will be the speed sensor on the compressor but, I'd start with that r/d pressure switch and circuit first.  You can always try calling me if that will help.Regards,Dick508-641-8477 east coast
On Tue, Jul 22, 2008 at 7:25 PM, Hugh MacGregor <hugh587 at hotmail.com> wrote:




 
----- Original Message ----- 
From: Hugh MacGregor 
To: mb coupes 
Sent: Tuesday, July 22, 2008 6:56 PM
Subject: a/c problems

Hi All
My 86 560sec was converted to 134a by the previous owner. Last summer I topped up the 134a charge and the a/c worked great. This year I did the same thing, high low pressures are in range, still the compressor won't come on. I looked back through the archives for tips , I jumped the pressure switch on the dryer at the R/H side of the radiator, the auxillary fan came on the compressor did'nt. I jumpered the 5&7 pin on the klima relay and yes the compressor kicked on. I swapped the klima relay with a good one and still no compressor. I see in the archives that Markus Meyer had a similar problem last year, I think he installed a new speed sensor on the compressor, but I'm not sure how to test it. Can anyone help me out! I'm roasting.
 
Hugh MacGregor
86 560 sec

The MB Coupes Website!W126 SEC Mailing ListPostings remain property of MB Coupes, L.L.C.
_________________________________________________________________
If you like crossword puzzles, then you'll love Flexicon, a game which combines four overlapping crossword puzzles into one!
http://g.msn.ca/ca55/208
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/mbcoupes/attachments/20080729/efe094a0/attachment.html>