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Old 12-13-2008, 09:48 PM
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Join Date: Dec 2008
Location: Sacramento, CA
Posts: 1
'81 380SL lack of heat

Hello everyone. I just purchased an '81 380SL last week and I'm glad to say that just about everything is working flawlessly. Aside from a stuck rear pin on the hard top, hoping some curious screwdriver prodding will find the release hook and fix that, the heat doesn't seem to be working. The a/c works and I've read that the monovalve seems to be the culprit for most heat/cooling related issues when the rest of the system seems to be working. Only problem is, I don't know if I have a monovalve. I know it is supposed to be on the firewall but the only thing I can find is a large box with vacuum lines going into it and I'm wondering if that's the dreaded servo unit. It has the auto climate control, which I thought was the monovalve setup, but read another post here contradicting that. Any ideas? Is there a temp fix to get heat if it is the servo unit? Its not extremely cold around here (50-60s during the day) but my girlfriend is a bit of a wimp when it comes to cold so won't ride in it with me till the heat is fixed.

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Old 12-20-2008, 05:00 PM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,318
Your car doesn't have a monvalve. It has the older-style climate servo. If you have no heat in any position including DEF, I would guess that the water valve has failed or corroded shut. There's no easy fix.

For five bucks, George Murphy at Performance Analysis will sell you an excellent diagnostic manual.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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