Hey guys. I have been searching through these forums for over a year now, but I have never made a contribution. I figured I would make one today. I hope this will help out any Z32 owners whose heat or vent control has went out.
Fall last year, when the first cold nights started appearing, I noticed my air wouldn't switch for cool to hot. I figured my heater core might have been stopped up, or the control unit was bad. The unit was pretty beat up. I also noticed that when I tried to switch the vents it would sometimes freeze up and not switch from feet to defrost or any of the other settings. So I ordered a new control unit to replace the broken one. Or so I thought it was broken. When I got the new unit in, that didn't fix the prolblem.
So the next time I had a vacation from work I decided to investigate. I pulled the dash (PITA) and started messing with it. I found out that the motors were seized up that controlled the vent control and the air mix control. I tried to replace the motors from the 91 parts car I had, but it had the automatic climate control so they were not compatible. So I set the air mix to heat manually by moving the heater core control valve. So I would be fine during the winter, but I had to reach under the dash and switch it manually when it warmed back up again.
So now its winter time again, and I'm tired of dealing with no defrost and having to lay in the floor board to change the heat. I ordered the new motors from Courtesyparts.com and installed them yesterday. It was quite an ordeal but it wasn't as bad as the first time I tried to fix it.
Here's the part numbers and prices for the two motors.
27731-30P00 [27733M] Actuator Assy-Mode $76.51(This controls your vents)
27732-30P00 [27733N] Actuator Assy-Air Mix $108.98(This control your heat)