87, 560SL, heater blower regulator

[lakeside]

I'm going nuts trying to find the correct blower motor. replacement. I have a replacement in hand but I'm question whether it will work. Here's my question. The original blower part number is 107-830-03-83, which has an 8-pin regulator connection. The one I received has 7 pins. What is the operational difference between the 7 & 8 pin regulator operation? I'm afraid to try the 7-pin in my car for fear of blowing something.. I'm hoping it will work but it probably won't and I don't want to damage the blower preventing it's return..

Edity I may be using the wrong term when I say "regulator." I'm referring to the connector that connects the blower motor to the climate control harness under the hood.

[abiby]

Try this link, esp post 7

http://www.benzworld.org/forums/r-c107-sl-slc-class/1382900-560sl-blower-motor-kaput.html

I believe he's referring to a 2pin connector at the motor.

[lakeside]

Call me a nut case, but I was wrong about the "regulator" pin number. I was relying on memory (big mistake) but decided I'd get the old blower and make a visual comparison. Surprise! My original blower has a 7-pin connector as does the replacement blower. I'm assuming at this point that the blower will work in my '87, 560SL, though I have not installed it yet. I'll do that in the next day or two.

[lakeside]

I installed the blower, this morning, and it doesn't work, though it appears to be a near new blower. I think I may have a related electrical problem, however. After trying to start the blower a few times, the blower worked, momentarily. Then I shut it off, and when I tried starting it again, it wouldn't work. Is there another component in the a/c-heating system that will interrupt the blower operation? The fuses are okay (in fact I replaced them all about a month ago, and I recently replace the climate control unit, The a/c-heating system was working fine until the old blower stopped. The other thing is that we've had a lot of rain the last few days, When it rains hard I have a difficult time starting the SL. That was particularly hard, today, So, I'm wondering if there is something under the hood that may interrupt the blower electrical connection.

[ctaylor738]

On the 560, blower speed is controlled by a relay located behind the glove box. If everything else works correctly, like the flaps move and compressor comes on, then I would suspect the relay.