Ha - I initially thought the clutch might be an issue, but got talked out of it. I'll replace the fuse and check the horn etc. to isolate the clutch and see what transpires.
I think that low pressure relay was replaced by the mechanic but I'll check over the bill and see. Thanks for the hints; will keep list posted until I get the issue resolved. Karl --- On Mon, 10/12/09, Rich Thomas <richthomas79td...@constructivity.net> wrote: From: Rich Thomas <richthomas79td...@constructivity.net> Subject: Re: [MBZ] a/c no worky To: "Mercedes Discussion List" <mercedes@okiebenz.com> Date: Monday, October 12, 2009, 1:31 PM You might also want to check the low-pressure cutout switch that (if I recall) is located down low in front of the right fender next to the radiator. If that has gone bad/funky nothing will come on. You could just short it and see if things come on. Probably doesn't relate to the horn aspect, but its an easy check. --R Craig McCluskey wrote: > On Mon, 12 Oct 2009 07:57:25 -0700 (PDT) Karl Wittnebel > <kdwittne...@yahoo.com> wrote: > > >> The following day, I loaned the car to my sister, who turned the A/C on >> and , well, nothing but hot air. And the horn wouldn't work. I replaced >> the relevant fuse, which was blown, but the new fuse blew immediately. >> Took it to mechanic (Algerian dude at Marina Benz) who replaced a bunch >> of stuff, including the control unit in the dash and apparently some >> relays. The compressor was fine. The bill was expensive, but it worked >> when I left. Briefly. I used it on another hot day, and, well, you can >> guess what happened: worked fine that day, but the next time I turned it >> on: nothing but hot air. And no horn. Compressor clutch does not make >> any noises of engagement at all. Belt is fine. Any hints as to where the >> trouble may lie? I don't miss the A/C but here in LA I really need the >> horn on the freeway...just thought I'd ask before throwing more money at >> the problem. >> > > If the fuse that powers the compressor clutch is blown, it won't try to > engage even if the controller does send the signal to engage. Does the > horn work when you put in a new fuse, before you try the A/C? If it does, > disconnect the wire for the clutch magnet and try turning the A/C on. If > the horn still works, turn the car off, reconnect the magnet wire, and try > the A/C again. If the fuse has now blown, the clutch magnet is the > problem. > > It sounds like the Algerian dude threw parts at the control side of the > problem. It also sounds like that was not the problem. I agree that you > need a new mechanic. > > As a first guess, I'd say that the windings on the compressor clutch > magnet might be shorted (at least partially). You could get the > pulley/clutch assembly off a salvage yard car and try it. > > > Craig > > > P.S. Welcome to the list, Karl. > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://okiebenz.com/pipermail/mercedes_okiebenz.com/attachments/20091012/27bd2292/attachment.html> _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://okiebenz.com/pipermail/mercedes_okiebenz.com/attachments/20091012/2131c4a4/attachment.html> _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
