Re: [MBZ] a/c no worky
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. Parts out in the moving/vibrating/oil-covered/dirty end of things experience failures. Clutch coils, wires and connectors to the same, etc. Look over that stuff carefully, from the clutch on back (through pressure switch, etc.) Or it could be the horn, or anything else sharing the fuse. The trick is to diagnose what blows it. -- Jim ___ 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
Re: [MBZ] a/c no worky
The problem seems to be directly related to the use of the A/C. If I don't use the A/C, the horn will be fine for months. So I doubt the horn is the culprit per se. I'm no genius when it comes to checking for shorts; do I just put a voltmeter on the powered wire and look for zero ohms resistance? Thanks,K --- On Mon, 10/12/09, Mitch Haley m...@voyager.net wrote: From: Mitch Haley m...@voyager.net Subject: Re: [MBZ] a/c no worky To: Mercedes Discussion List mercedes@okiebenz.com Date: Monday, October 12, 2009, 4:22 PM Any chance the problem is in the horn circuitry, or even the contacts/wiring in the steering column? Mitch. ___ 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/20091013/979c53e4/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
Re: [MBZ] a/c no worky
You could probably do that from the power line to the horn (disconnect it first) and see if you are getting a low resistance without pushing the horn, then push the horn and see if you get a change in resistance, then switch to volts and see if you are getting any voltage to the horn (which might be less than 12V if it is shorting out). --R Karl Wittnebel wrote: The problem seems to be directly related to the use of the A/C. If I don't use the A/C, the horn will be fine for months. So I doubt the horn is the culprit per se. I'm no genius when it comes to checking for shorts; do I just put a voltmeter on the powered wire and look for zero ohms resistance? Thanks,K --- On Mon, 10/12/09, Mitch Haley m...@voyager.net wrote: From: Mitch Haley m...@voyager.net Subject: Re: [MBZ] a/c no worky To: Mercedes Discussion List mercedes@okiebenz.com Date: Monday, October 12, 2009, 4:22 PM Any chance the problem is in the horn circuitry, or even the contacts/wiring in the steering column? Mitch. ___ 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/20091013/979c53e4/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 ___ 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
Re: [MBZ] a/c no worky
I'm no genius when it comes to checking for shorts; do I just put a voltmeter on the powered wire and look for zero ohms resistance? An ohmmeter would be better. But yes, that's basically how you start. But look for obvious physical damage to the wiring first. -- Jim ___ 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
[MBZ] a/c no worky
Hello All, My 1985 123 wagon had a fully functional A/C until I used it one hot day last fall, when it kept the entire car of six people cool on a 100 degree LA day. No problems on that day whatsoever. 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. Also, for any CA locals, is this Enrique guy up in Tarzana the best mechanic in the area if I need a new one (which I apparently do)? Regards,Karl in LA85 300TD 170Kmi --- On Mon, 10/12/09, Jim Cathey j...@windwireless.net wrote: From: Jim Cathey j...@windwireless.net Subject: Re: [MBZ] Bore measurements on 140 SD To: Mercedes Discussion List mercedes@okiebenz.com Date: Monday, October 12, 2009, 10:50 AM So far as I know, pistons/rods _always_ come out the top. -- Jim ___ 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/f8dcb9a4/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
Re: [MBZ] a/c no worky
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
Re: [MBZ] a/c no worky
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
Re: [MBZ] a/c no worky
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
Re: [MBZ] a/c no worky
Any chance the problem is in the horn circuitry, or even the contacts/wiring in the steering column? Mitch. ___ 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
Re: [MBZ] a/c no worky
Check the clutch coil for a short. Peter ___ 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
