When you are practiced up would you be interested in doing another? Mine is back to working correctly after a month of problems, but if it lasts the summer I think I had better have it done next winter. BillR
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Luther Sent: Wednesday, June 18, 2008 10:56 AM To: Mercedes Discussion List Subject: Re: [MBZ] '86 SDL no a/c Low pressure switch was already bypassed by the po. So I pulled the KLIMA relay and the instant I hit pins 5 & 7 together, I heard the clutch kick in. I'm going to resolder the KILMA now. How can I tell if the low pressure switch is good? The system has full charge from Monday morning (I hope it hasn't leaked out by now...) Luther On Mon, 16 Jun 2008 17:55:31 -0500, Peter Frederick <[EMAIL PROTECTED]> wrote: > First, check for voltage at the low pressure switch on the reciever/ > dryer. This is the one with spade lugs and push-on connectors. If > you have voltage (12V or more) to ground, the pushbutton unit is not > switching the compressor on. Jumper them together with the engine > running and the ACC on -- if the compressor runs, either it's already > low on charge or the switch is bad. If there is no voltage and it > doesn't run jumpered, time to check ou the KLIMA relay, it's not > switching on. > > You should also watch the compressor when first starting the ACC up > -- if the compressor runs a few seconds and kicks out, you are not > getting a good speed signal from the compressor to the KLIMA relay, > and it will shut of the compressor until you do a power cycle. This > can be quite annoying. > > Finally, you need to jumper the #5 and #7 (I think, will check > tonight) sockets in the KLIMA relay socket with a large wire -- this > directly engages the compressor. If it then runs and cools properly, > you have a problem with the KLIMA relay. There are a series of > checks there, but no need to get all exited unless the compressor > ground signal is good and you don't have engagement. > > Also check the fuse -- a bad clutch coil will blow the climate > control fuse. > > Peter > > > -- Luther KB5QHU Alma, Ark '87 300SDL (272,xxx mi) head case '85 Ford F250 6.9 diesel (x58,xxx mi) '82 300CD (166 kmi) '82 300D (74 kmi) getting donor engine-sold '85 300D (280,176) parts car sans engine _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
