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Old 10-25-2001, 07:33 AM
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Angry Still looking for help - 91 300se electrical and heat

Still looking for help on the interior driver door problem. Interior lights will not turn on when the door opens. Passenger side works fine. Also, I notice the rear heat vent only blows cold air, even when the heater is on. Is that right??
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Old 10-25-2001, 08:06 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
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Drivers side door switch operates thru the WARNING buzzer. It is under the drivers under dash panel.
Rear seat vent is either fresh air or A/C, no heat. Heater ducts are under the front seats.
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Old 10-25-2001, 07:40 PM
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My 91 300SE blows cold air from the rear vent even when the heater's on and no air blows from the center dash vents. I was wondering why my kid was complaining that he was cold when I have the heat turned up. I guess this is normal.

91 300SE
81 300SD
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Old 10-25-2001, 10:07 PM
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Join Date: Jun 1999
Location: Los Angeles, Calif, USA
Posts: 521

For the electrical problem, try the following links to see if they help:

Interior lights

560SL Door Switch


Last edited by be459; 10-26-2001 at 05:09 AM.
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Old 10-26-2001, 07:40 AM
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91 300se Door light problem

Thank to MB DOC and others for the help. It appears this is a job for a good tech. On the 300SE do you need to remove the cluster display to get to this diode for replacement?

Thanks again.
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