Pulled blower motor out today, cleaned, lubricated, tested. Motor draws 2.25 amp with no blower, seems reasonable. Reassembled into car, blower switch turned to “O”, turned key to “on”, blower runs full speed with no control over speed with switch. Start car, blower stops, no control with switch, no...

Sounds like I have a course of action for tomorrow! Will pull the fan and thoroughly test it. Thanks for all of the responses.

Only when the fan runs (on full), which is maybe 20% of the time. Otherwise no lights, no nothing. When the fan does run it seems to be only in “on” position (not “acc”) and goes off when I go to “start”. After starting it stays off. I have jiggled key to half-a** test for bad keyswitch.

Thanks for the info. I intend to tear into it this weekend and try to gain more knowledge. Absolutely will clean and exercise connections to fan and MOSFET and test fan.

Thanks for the reply. When I had the ECCU out and cleaned the connections I also inspected the boards and all looked good. The fan seems to only run when it is dead-cold on start-up. Runs for 15-20 seconds then nothing. While it is running I have no control over it. It sounds fine but I intend to pu...

'94 850 w/ECCU - Last summer the AC worked intermittently, I pulled the ECCU, cleaned all the contacts and it worked for a week or so (in both auto and manual modes) then went back to intermittent. We now need heat and it does nothing (no lights, no fan, no heat trickling out at highway speeds) but ...