My 87 300SDL Climate Control is not working. The blower fan is not running at low, high speed or auto. The problem started with the blower running for a short while then stop. If I leave it for a few hours then the blower will run again for a while and stop. Now it is all dead. I changed out the Climate Control Unit with another one and it is the same. I opened up blower motor and measured the voltage across the terminals and no voltage. It does not seem to be the blower mal-functioning.

Any idea what else could be wrong? After I removed the glove box panel and press the fan button, I hear some relay sound clicking inside. Am I missing any more electronics in the Automatic Climate Control?

Thanks

83 300D, 87 300SDL.

 

Fixed the blower problem. It was a burnt fuse. The reason it took me so long to find is that it worked intermittently. The fuse was not fully burnt but I intially suspect it was the motor brush. It threw me off track completely. Anyway, I look at the fuse box and it says blower fuse outside the box but it does not say where. I looked high and low and eventually located it on the left of the box with a cover. It is a special fuse, like a piece of flat aluminium. I replace it and I have fresh air again.

 

i pulled my motor and my one brush was melted to the spindle, i wish i was as lucky as you.

 

I did pull the Automatic Climate Control out and replaced it. Did not work. Pull the passenger panel out to expose the blower motor, motor tested good. I did a LOT of work but in the end I suspected the fuse because I did not see supply voltage to the blower. It is a 3 wires plug; ground pin, 12V supply pin and a regulating voltage pin for low, high and auto. I can see the regulating pin voltage varies with the speed button pressed but no supply. I looked at the 300SDL schematic 1986 ( not my current year 87 ) and I did see a fuse but it is not listed in the fuse box. It took me a while to locate the sucker. Hope this help other owners.

 

hi,dont suppose anyone knows where the blower motor and regulator are located on a clk 320 99model?thanx