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  #1  
Old 09-09-2005, 10:25 AM
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115 fan switch removal - how?

The a/c fan control switch on my W115 is DOA and I cannot figure out how to remove the daggone thing!! A cursory search of the forum has revealed nothing; the FSM is devoid of any info either.

I spent an hour looking at it last night, making a little progress however, I was stumped after discovering and removing two screws that hold the middle vent in place only to find that the air diverter lever pivot and linkage prevents that vent assembly from coming out.

Anyone here ever dig that far into a 114/115 dash?

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Old 09-09-2005, 11:31 AM
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First, you're sure the problem is the fan switch and not the fuse or change-over switch. These cars use the same fan switch to operate separate AC and heater blowers, with a vacuum operated change-over switch mounted above the gas pedal to switch the electrical circuit from one blower to the other, depending on the position of your AC temp control knob. If the heater blower works but not the AC blower, it's probably not the fan switch.

The fan switch knob and shaft are held in place with an internal spring clip. Pull the fan knob straight out. You may need to gently twist the knob as you pull in order to get the clip to release, but do NOT try to unscrew it or you will break the switch. Once the knob/shaft is out of the way, you can unscrew the chrome nut to release the lower part of the vent panel. Also pull off the 4 knobs for the sliding controls. Before pulling off the vent panel assembly, remove the radio grill and speaker from the dash so you can reach in the hole and unclip the rubber air duct. Unless someone's been in there before and lost them, this rubber duct should be attached with several plastic button clips. Then you'll need to go through the vent with a long screwdriver and unscrew the captive philips nut on the control lever to disconnect the fresh air control rod. Once the vent panel is out, you should see two small screws or bolts holding the control/switch panel in place. Also unfasten the two fiber-optic cables that illuminate the sliding controls before pulling out the panel. Hope this helps.

Happy Motoring, Mark



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Old 09-09-2005, 11:56 AM
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Quote:
Originally Posted by Mark DiSilvestro
First, you're sure the problem is the fan switch and not the fuse or change-over switch. These cars use the same fan switch to operate separate AC and heater blowers, with a vacuum operated change-over switch mounted above the gas pedal to switch the electrical circuit from one blower to the other, depending on the position of your AC temp control knob. If the heater blower works but not the AC blower, it's probably not the fan switch.

The fan switch knob and shaft are held in place with an internal spring clip. Pull the fan knob straight out. You may need to gently twist the knob as you pull in order to get the clip to release, but do NOT try to unscrew it or you will break the switch. Once the knob/shaft is out of the way, you can unscrew the chrome nut to release the lower part of the vent panel. Also pull off the 4 knobs for the sliding controls. Before pulling off the vent panel assembly, remove the radio grill and speaker from the dash so you can reach in the hole and unclip the rubber air duct. Unless someone's been in there before and lost them, this rubber duct should be attached with several plastic button clips. Then you'll need to go through the vent with a long screwdriver and unscrew the captive philips nut on the control lever to disconnect the fresh air control rod. Once the vent panel is out, you should see two small screws or bolts holding the control/switch panel in place. Also unfasten the two fiber-optic cables that illuminate the sliding controls before pulling out the panel. Hope this helps.

Happy Motoring, Mark



.

Danke Mark!
I flashed it out and the fuses and switchover are OK. Additonally, the fan will work intermittantly if you twiddle with the knob...it's been progressively getting worse (not working) over the last year. Thus, I'm confident it's a geriatric fan switch.

In my efforts last night, I figured out how to remove the fan knob, slider knobs and the retaining bezel/threaded washer behind the fan knob. I also saw that screw on the flap control lever and it figured that screw was the last thing that needed to be removed but, I was concerned about getting everything back in place...afterall, I was working on it in a parking lot, after dark, 70 miles from my shop (this is my daughter's car).

Thanks again!
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Old 09-09-2005, 01:01 PM
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Unscrew that philips nut until it detaches from the air-flap control rod. It stays attached to the fresh-air lever assy. It also serves as an adjusment, so don't just crank it down tight when you re-assemble it. Have you found a replacement switch yet or are you going to try surgery on the old one? Good luck.

Happy Motoring, Mark
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Last edited by Mark DiSilvestro; 09-09-2005 at 01:07 PM.
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Old 09-12-2005, 11:03 AM
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Mark,
I'd like to resurrect the old switch if possible. But, I have another 115 that is a parts donor; I plan to yank the switch out of it and take it with me next time I go to San Antonio. With your directions, I'm confident now that I can pull the switch and, if necessary, swap it out.

Many thanks!
Randy
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Old 09-12-2005, 06:45 PM
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Many years ago, I had to remove the heater control panel on my Dad's '72 W114 250C. Unfortunately, I tried to unscrew the fan knob and broke the switch. Using the remains of the old switch as a pattern, I was able to adapt a rotary multi-contact Taiwan Radio-Shack switch, the only replacement that was availible on a weekend. Since that Taiwan switch had a low amp rating, I had to triple-wire the switch so that each fan speed was carried by three sets of contacts. I own that 250C now and that switch is still in there, but I do have an orginal replacment just in case.

Happy Motoring, Mark

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