[mdz0739]

Before buying a new blend door motor assembly, try and FIX IT!

My mother has a '94 Oldsmobile 88 that had the same problem with the broken gear. The blend door motor assembly looks just like the one posted here. I made a REPAIR on the assembly this morning without having to purchase a new part. I thought I would pass this on, maybe someone can fix theirs also and save a few bucks.

When the large gear cracks and the crack rotates to where the smaller gear contacts it, the gear loses contact and the arm stops. Not all of the large gear is used when opening/closing the blend door. Only about 45% (a guess) of the gear is used. Just remove the gear from the metal shaft and rotate it to where the crack is in an area where it won't ever come in contact with the smaller gears then press the gear back onto the shaft.

Be sure and make note of what the actuator arm position is before removing it. Also, the metal shaft that the large gear presses on has stops on it. The stops are on the bottom of the plastic housing. Make sure you get everything lined up like it was before you disassembled it. I had to plug my assembly in with the top of the case removed and adjust the temperature control slowly to make sure I wasn't going beyond the stops before putting it all back together. I took the opportunity to put a small amount of silicon grease (light bulb grease) on the gears before putting it back together. The assembly works great now, just like brand new!

Mike Z.