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#16
04-30-2010, 12:13 PM
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Year and model helps.
The early ones were recalled for solder issues, yours sounds like other problems. The center vent not working is an indicator that you either have inadequate vacuum or the vacuum pods are leaking, should be a few articles in the DIY section on checking/changing vacuum pods. Also search aspirator blower and cabin temp sensor.
__________________
 Gone to the dark side - Jeff 
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#17
05-02-2010, 04:50 PM
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The connector checks o.k. for voltage, etc.
Before I start to rip most of the front end out to get to the blower motor and its controller, questions: 1. Is there an underdash panel perhaps that would also gain access to the wires from the controller to the motor? 2. Since grounding the blue wire will provide a full 12V to the blower motor, indicating a bad controller, is it possible to simply rig a circuit through a relay and a dash mounted switch to actually do that and get high speed blower operation when you need it?
__________________
'76 240D-Sold '78 240D-Sold '85 300 SD, 165K-Sold '88 300 TE, 165K-Sold '64 Porsche 356C Cabriolet- under restoration '86 560SL 124K Miles-Sold '94 320E Wagon, 74K Miles-128K Miles JUNKED '06 E350 Wagon, 84K Miles 07 SL550, 14K Miles
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#18
05-02-2010, 04:55 PM
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You are supplying power to the speed controller, which indicates that the speed controller is fine IIRC, and the problem lies in the ACC / pushbutton unit.
__________________
Gone to the dark side - Jeff
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#19
07-16-2010, 06:24 PM
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To finish this, I finally got around to exposing the blower motor and I throughly cleaned the filters. (They blow off and wash quite nicely if you want to save about $40). Then I spliced in and ran a wire from the blue connection on the motor to the dash, where I installed a good toggle switch and from there to a good ground. Wow, when I flip that switch do I have air now! When I had the blower exposed I did a strobotach test and at low speed it turned up 3200 rpm and now, at the grounded high speed, it turns 6400 rpm. Running that wire was not at all a fun thing to do but it surely worked. Thanks for all the help.
__________________
'76 240D-Sold '78 240D-Sold '85 300 SD, 165K-Sold '88 300 TE, 165K-Sold '64 Porsche 356C Cabriolet- under restoration '86 560SL 124K Miles-Sold '94 320E Wagon, 74K Miles-128K Miles JUNKED '06 E350 Wagon, 84K Miles 07 SL550, 14K Miles
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