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-   -   1975 SL Heater control Placements-HELP!!! (http://www.peachparts.com/shopforum/mercedes-benz-sl-discussion-forum/212964-1975-sl-heater-control-placements-help.html)

Tims450SL 02-06-2008 04:29 PM

1975 SL Heater control Placements-HELP!!!
 
Please Help! :0) I have a 1975 SL with the sliding heater controls on the facia. there are two on the left and two on the right. I have NO Manual so I need to know how the settings go-basically I would appreciate how to TURN OFF the heat! I cant figure it out! Thanks tons!!!

ctaylor738 02-06-2008 10:19 PM

One lever on each side is heat on that side, so if you have all levers in the down position, all heat should be off.

The water valve for the heater is vacuum controlled. It needs vacuum to keep the valve closed. So if you have a bad valve. or a vacuum leak somewhere, it will go to full heat. One way to fix this itemporarily is to locate the valve and vacuum line on the firewall. Disconnect and plug the vacuum line and then you can manually move the valve to the closed position, which should cut off the heat.

The permanent fix is to find out where the vacuum is being lost. It is fairly common for the diaphragm on the valve to go bad.

pwrslider 02-07-2008 04:02 AM

Quote:

Originally Posted by Tims450SL (Post 1755121)
Please Help! :0) I have a 1975 SL with the sliding heater controls on the facia. there are two on the left and two on the right. I have NO Manual so I need to know how the settings go-basically I would appreciate how to TURN OFF the heat! I cant figure it out! Thanks tons!!!

Starting at the drivers side....

Lever 1: is the control for up or down ( dash air/heat or floor) for the drivers side.

Lever 2: is the heat control for the drivers side...up for hot..down for off.

Lever 3: is the heat control for the passenger side ( see lever 2)

Lever 4: is the up / down control for the passenger side.

hope this helps......

Tims450SL 02-07-2008 09:23 AM

Thanks guys! WOW I could cry thanks for helping that was terrific! You guys are the best! SL forever!


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