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10fords 11-04-2012 01:48 PM
Quote:
Originally Posted by kerry (Post 3042531)
Have you looked in these locations?
Yes, sorta! I can't find one on the fenderwell and am not sure where it would be at in the defrost vent, even though I have tried to find it. I hooked the blower up to straight 12 volts and it spins fast, so I think it has to be the switch or the resistors. Now if I can just find those darn resistors......

10fords 11-04-2012 01:55 PM
OK- I just located my handy dandy 1981 MB electrical troubleshooting manual, and it say the resistors are "above passengers footwell, in fresh air duct". I'll try again after a beer and some breakfast!

jay_bob 11-04-2012 02:30 PM
If you found the blower you are in the right neighborhood, look at the big black behemoth under the dash (the air box), it is in the bottom just to the left of the blower location.

It is a flat plate with electrical connections.

Note that it relies on the air flow to cool it...so the actual resistor elements are on the back of the plate. They look like springs but beware they get hot when under load.

10fords 11-04-2012 02:56 PM
Quote:
Originally Posted by jay_bob (Post 3042544)
If you found the blower you are in the right neighborhood, look at the big black behemoth under the dash (the air box), it is in the bottom just to the left of the blower location.

It is a flat plate with electrical connections.

Note that it relies on the air flow to cool it...so the actual resistor elements are on the back of the plate. They look like springs but beware they get hot when under load.
I found the connector to the left of the blower, but the wires to the resistors go behind the center of the dash and I cant find where they lead to:confused: I tested the output from the switch and it works fine so it has to be those da#* resistors.:mad:

KAdams4458 11-04-2012 04:43 PM
sounds like pre-switchover to me. look under the cowl cover. they're just about straight under the wiper motor.

10fords 11-04-2012 05:31 PM
Quote:
Originally Posted by KAdams4458 (Post 3042610)
sounds like pre-switchover to me. look under the cowl cover. they're just about straight under the wiper motor.
I will try that right now! I got interrupted by my son being in an accident, and I had to go pick him up:eek: Everyone was OK except the cars, so all is well and time to get back to work!

10fords 11-04-2012 05:44 PM
OK- I still can't find them. What do I have to remove to get to these magical resistors? I have the passenger side cover and the glovebox removed. Do I have to take the whole evaporator box out? Maybe more beer will help! Regarding the switchover thing, there is a switchover valve under the dash to the right of the glovebox.

jay_bob 11-05-2012 08:23 AM
Look at the bottom of the air box, near the center of the car, from the right side under dash access area.

There is a 4-pin connector C134 in the under side of the air box.

You can follow the wires from the blower motor, they end up on this connector.

Behind this connector is a metal plate, the resistors are inside the box in the air stream.

10fords 11-05-2012 09:22 AM
Quote:
Originally Posted by jay_bob (Post 3042981)
Look at the bottom of the air box, near the center of the car, from the right side under dash access area.

There is a 4-pin connector C134 in the under side of the air box.

You can follow the wires from the blower motor, they end up on this connector.

Behind this connector is a metal plate, the resistors are inside the box in the air stream.
The 4 pin connector is on the front of my air box. From there the wires to the resistors disappear to the middle of the dash. To get to the resistors it seems I will have to disassemble a whole lot of stuff unless I am just overlooking something. I think I'll just jumper the wires at the connector to bypass the resistors for the time being. :(

KAdams4458 11-05-2012 03:45 PM
Did you look under the cowl cover? It's that metal plate outside of the car between the two cowl vents. Removing it involves pulling the wipers, cowl vents, and then the plate is held down with a nut on the passenger wiper pivot, two screws and four plastic pushpin fasteners.

10fords 11-05-2012 10:48 PM
Quote:
Originally Posted by KAdams4458 (Post 3043231)
Did you look under the cowl cover? It's that metal plate outside of the car between the two cowl vents. Removing it involves pulling the wipers, cowl vents, and then the plate is held down with a nut on the passenger wiper pivot, two screws and four plastic pushpin fasteners.
I haven't tried that but it sounds like a great idea! Have you done the resistors this way?

KAdams4458 11-05-2012 11:27 PM
Quote:
Originally Posted by 10fords (Post 3043527)
I haven't tried that but it sounds like a great idea! Have you done the resistors this way?
Can't say that I have, but I just replaced the wiper motor on my '77, and got my screw driver tangled in them when I dropped it. My resistor assembly still works. (knock on Zebrano!)

10fords 11-07-2012 09:28 PM
To follow up on this subject- K.C. was spot on. To get to the resistors you have to take the cowl cover off and they are right there! Unfortunately that wasn't the cause of my problem and it turned out to be the switch (which I thought I had properly checked, but I was wrong). Oh well, I now have one more bit of knowledge on MB repair. Thanks to all who helped- Scott


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