'86 300SDL Under-Dash Panel Removal - Passenger Side

Yes they can but they do come apart.

Thanks all for the help. Problem fixed. Service manual instructions were "incomplete".

Yeah true, but it's nice to clean the upholsetry while it's off. It can get pretty dusty under there.

There's a balck plastic shield or cover that is between you and the blower motor. It is held in place by 3 or 4 philips screws AND has some plastic tabs that lock it into place at the rear of the upholstery piece. That might be what's messing you up it got me the first time.

If you're still stuck I can send pics as mine is aaprt right now for cleaning anyway.

Thanks for all the help. I was finally able to pull the heater blower motor with the intent of replacing the brushes. Before repairing the motor, however, I applied 12Vdc directly and the motor works fine.

The motor therefore was not the problem with the blower fan not working. Next to the motor is a finned aluminum "heat exchanger" with three input wires out to a plug and a red and blue wire going to the motor.

I suspect that there is an over temperature sensor on the "heat exchanger" that may have failed in the open position because I do not get continuity across this unit from the blue motor wire to any pin on the plug.

I do get continuity from a pin on the plug to the red motor lead.

Motor

Can anyone confirm that there is a normally closed (NC) overtemperature contact on the Finned Aluminun Heat Exchanger?

(Since I have voltage on the female end of the plug I do not believe that the pushbuttons are an issue. Any other trouble shooting tips will be appreciated.)

Anyone with a circuit schematic?

Thanks

Ok, BTDT. There's all sorts of bits and pieces to maknig thr automatic climate control work. But, the one that fails 99% of the time IMO is the climate control pushbutton assembly.

It's where all the logic is to drive the whole system. There's

You need to get a new one of these although new is perhaps the wrong word as they're bicg bucks new. You can usually get one off ebay for about $50.

When/why did it stop working? Blowing any fuses? Upgrade the stereo?