power being sent to the fan directly Without seeing MCC/ECC dash units, I know nothing, but schematics suggest otherwise. I can't lookup your specific part, but for one ECC, it cost around $500.00 new , so jerry-riggers do what-ever it takes. If you scroll down that page to Fitment/Applications, an...

Okay, I got around to testing more things on the HVAC system. I pulled the #7 fuse and no blower. Put it back in, and it ran at full. (I say "full" but I have not tested to see if I have full battery voltage at the blower.) Not sure of the next step, but tempted to use the 20 amp PWM fan c...

I'll try to remember to pull the #7 fuse when I get home tonight. The temp control does work. The air vent controls work, for the most part. Mostly panel and floor. The bi-level and defrost are a little weak. Probably a vacuum line somewhere in there. Regarding power being sent to the fan directly, ...

I wonder if the car was originally ECC and someone swapped the control unit for an MCC one. The wiring harness in the vehicle (wire colors, etc.) seems to follow the ECC diagram.

MCC system...a manual system... 68 MB file, so DL and SAVE. On PDF page 23 (218), it shows MCC setup, and on PDF page 248 (219), it shows component location. From a 1994-940 wiring diagram, they show these numbers below as this, which the last two seem not right 4/40 - A/C Controls, MCC 2/10 - ECC ...

I'm tracking with you, 93Reg. Mine is MCC, based on the control knob configuration on the control unit. The fan runs all the time with the key on. Turns off when key is off. Thanks for the recommendation about not putting near the ECU. I'll find someplace to mount it safely. I have a question: not k...

Thanks, again, 93Reg. At this point, chasing the proverbial wild geese with this is getting old. Seriously considering the PWM approach. Thoughts on this 20 amp controller? http://www.ebay.com/itm/111930282177?_t ... EBIDX%3AIT

While I had the resistor out of the car, I got out my digital pocket multimeter. It is autoranging. See the pic below for how this tested out. With the wiring colors, and the numbers of them totally off from the green book diagram, I'm at a loss. s90 blower resistor pinout and test.jpg Any guidance ...

Okay, it just got even weirder. I pulled the glove box and got to the blower resistor again. The except for the one plug on the left, none of the wiring colors match the diagram (smh). And the right connector which should have four wires going to it only had two. The used resistor only had 3 pins on...

This is what my resistor looks like: Not quite, here is what it really looks like below, which really is nothing more than this A/C Blower Motor Resistor For Chevy GMC Pickup Trucks shown. So, you put one probe on that single wire, and touch the other probe to those other wires, when on ohm scale. ...