Mercedes-Benz Forum banner

1 - 8 of 8 Posts

·
Registered
1971 280SE
Joined
·
37 Posts
Discussion Starter #1
Car is a 71 280se, 6 cyl. I have one broken heater control switch but if you use a key or screw driver you can still move it fine. When i mess with the knobs i can hear the fan FAINTLY turn on a humm. Seems like it should be way louder, and still no heat. Any ideas on where to start with this project? Any ideas or past experiences would be greatly appreciated!

Thanks!

-Brian
 

·
Registered
Joined
·
430 Posts
Did your fan used to work? check fuses, or maybe try to bypass the switch to check operation. You know I still got that parts car if you need.
 

·
Registered
73 280SE 4.5, 71 300SEL, 03 BMW Z4, 72 Fiat 850, 80 Triumph TR7, 85 Porsche 911
Joined
·
2,280 Posts
The heater blower controller is the same slide thing that controls whether you get fresh air or inside air. At ABOUT midway, the blower comes on. If you decide to replace the rubber control knob, the parts are available. The job entails taking apart part of your dash though, including the radio, glove box and some of the facing wood. Not tough, but a pain in the ass.

As for no heat, I hate to ask the seemingly dumb question, but are the other controls in the right places? Do the other controls slide as they should? Has the car ever had heat?
 

·
Registered
Joined
·
430 Posts
What confuses me is that in your road trip post you said your a/c worked until the pump blew up in the dessert. That leads me to assume the fan did work at that time. Also make sure your heater core is not plugged off or bypassed, That would cause no heat.
 

·
Registered
2004 S500. 2000 CLK430 Cab, 1999 C43 AMG. 1999 S500. 1999 S320. 1977 230 4 spd, 1972 280SEL 4.5
Joined
·
186 Posts
The heater fan sits up in the dash under the windshield in the center. I bet leaves have gotten in there and the blower wheel is stopped, thus the hum. This situation has been known to cause a fire if left un-repaired because the motor will overheat, catching whatever is in there (leaves, pine needles) on fire.

Regarding the AC, it uses a separate blower fan.
 
1 - 8 of 8 Posts
Top