Location: Blackheath, in the Blue Mountains NSW Australia
1995 SL500 Climate Control
I am new to the forum and this is my first post.
I have a 1995 sl500 100,000 km in show room condition. The problem I am having is when I put the air con on, I get hot air out of the two side vents and unless I press the blueg button in the center vent the air will be hot.
If I switch off the two side vents I get cold air out of the center main vent, but it seems like cold air comming over hot air. Please help.
Red button ON routs air through the heater core to the center vent.
Blue button ON routs outside Air to the center vent.
Both are for overridding the automatic climate control ssystem and direct cold/hot air to the center vent only, and has nothing to do with the side vents.
So leave them both OFF for automatic operation.
In automatic mode, the system controls air flap/doors to blend cold/hot air to the desire temperature, and those air comes out of both side and center vents (unless they are shut off by the thumb wheels).
From what you said, seem like you are getting hot air all the time, no matter AC is ON or OFF. Chances are you have a vacuum leak that the (vacuum operated) blending air flap door is stuck on routing Hot air only.
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