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Old 12-26-2000, 09:19 PM
Posts: n/a
Just wanted to know something about my heater blower. My blower does not work unless I turn on the A/C knob, in which I get air (on levels I, II & III) but only cold air. When the A/C knob is off, the heat only travels through my vents when the car is in motion.

Are there two separate blowers for the A/C and the heat, or do I just have my A/C and my blower fan wires crossed? (they both operate off of the same aux fuse box)



1976 230.4 W115

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Old 12-26-2000, 10:57 PM
Wm. Lewallen
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Blower motors

Your car uses seperate blowers for AC and heat. If your heater blower has gone bad, heaven help you. That is one big job to replace the fan. You will have fun.Be prepared to remove the wiper blades. You start by removing the console and just work your way to the fan.It is held on by three screws. Then you will see why you have to remove the wipers. Have fun and don't despaire.You can do it.
Bill Lewallen Lexington,Ky
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Old 12-26-2000, 11:16 PM
Posts: n/a
Great, I was afraid of this, as I have no access plate on my model. Also, no fuses are blown, so I guess I'll have to order the part this week. It seems that it retails for about $250 U.S. or so. Anything else I could check before I break the bank?


1976 230.4 W115
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Old 12-27-2000, 10:15 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Although nearly impossible to replace, it is easy to see. Get a flash light and look through the center vent. The blades of the motor are visable.

In Florida we occasionally got one of these things going again by sticking a long (I mean long) thin screwdriver through the center ducts and rotated the fan blade while under power. I say Florida because this only works on motors that have stuck from lack of activity. If this happens to work leave it run for a good time before shutting down.

The electrical is exposed at a four pin plug on the firewall in the area of the brake booster (to the center of the car if I remember correctly). I have diagnosed the electrical hundreds of times over the years and never have I done it without a wiring diagram in hand. Its a goofy system with one blower switch running two different motors. The switchover takes place on a switch directly above the gas pedal. The switch is moved by the vacuum actuation of the mode door. I think the default position is heat though.

Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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