| Saving your dash blower and circuitry [message #333075] |
Tue, 05 June 2018 08:25  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma:
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I've been slowly getting all systems working on a 91 ZR1 I got for a song. 100% stock but maintanance deprived. Not PO hacked. Neglected. Yesterday the dash blower quit on C68 touch climate stopped. 10 speed so I'm thinking head unit or solid state motor speed controller. Basclly same motor GM used on the TZE but with newer weatherpak connector. Figured I'd work backwards from the motor. You have to loosen the inner fender liner for clearance (sound familiar to TZE?). I was pretty sure it was an electronics issue as no tell tale squeeling before it quit. But no, could not even turn squirrel cage by hand. Zoom Spout oiler and a couple drops on each bearing and some gentle persuasion and it began to free up. I also spray flush the commutator and brushes with Caig F5. This used to be called MCL. Moving contact lubricant for carbon and plastic potentiometers and such. This cleans and the liquid leaving takes used carbon material away. Leaves behind a very light lubrication film designed for wiper on carbon resistor. Not unlike brushes on commutator. I was prepared to head to NAPA but this ran so smoothly and quietly I put it back together and saved the trip. Perhaps lubricating all fan motors every 2 years would be a good habit in the TZEs. Sit out in zub zero and then heat soak above 200F when you shut down after highway run. Lubricants off gas and gum. Then the cooling air diminishes to motor and resistor as the Amp draw rises. Usually melts at resistor connector or Hi relay or if you are unlucky at dash. Total cost was about a penny's worth of zoom oil and about $1 of F5 spray but that was not required to get it operational. It's also a good Idea to blow out road dirt and cottonwood etc as a first step before oiling but this one was pretty clean.
John Lebetski
Woodstock, IL
77 Eleganza II
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