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heater blower motor 'just quit' 200 1991

posted by  anderssj on  Sun Apr 26 10:00 CST 2015
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last visit: Thu Oct 23 17:03 CST 2014
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Hi!

My son in MN called to tell me the heater blower motor on his '91 240 sedan "just quit." Being that I'm in VA it's been a little tough to trouble-shoot. My experience with fan motor failures (at least 4 in as many cars) has been that they get noisy, etc., prior to quitting--I've never had one just suddenly stop.

I've looked at the wiring diagrams and there's not much between the fuse and the ground (switch, resistor pack, and motor).

FWIW, son's mechanical skills are limited, so I don't see him being able to check replace the switch, check for good ground, etc. So far he has tried all the speed settings on the switch and replaced the fuse, but still no fan. If it's the resistor, the fan should still work when the switch is on "4," correct?

Is there anything else he/we should be looking at, or should I just be ready to do all the trouble-shooting (and perhaps replace the fan motor, etc.) when I visit in a couple of weeks? I'm already planning on working on the car while I'm there, so I guess I'll just add this to the list . . . .

Thanks in advance--and for letting me vent a little.

All the best,

Steve A-








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    heater blower motor 'just quit' 200 1991

    uid 27's pic
    posted by  Art Benstein on  Mon Apr 27 13:26 CST 2015
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    last visit: Fri Oct 17 20:10 CST 2014
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    If the blower dies a sudden death, a bit of investigation is warranted. You already looked at the fuse, so the easy stuff is ruled out. It could have drifted onto a dirty spot of the commutator, which might right itself with a good jostling (pot hole road in Minn.?) but the only final proof you can do is to verify you have 12V on the motor leads themselves before deeming the the dirty job necessary. Due diligence.
    --
    Art Benstein near Baltimore

    Never test the depth of the water with both feet.








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      heater blower motor 'just quit' 200 1991

      posted by  anderssj on  Mon Apr 27 18:58 CST 2015
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      last visit: Thu Oct 23 17:03 CST 2014
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      Hi Art,

      Thanks for the reply. I found out my son used an old fuse to troubleshoot (wait--what?). He's going to get a new one and recheck. Due diligence indeed!

      In the meantime I dug out (and checked) the new fan motor I have on hand and will bring it along to MN. Will also bring my DVOM so I can check the switch, wires, leads, ground point, etc. Oh, and a copy of your on-line instructions (already used twice, thank you very much!).

      Good thought on the MN potholes . . . I'm wondering if they could have shortened the life of the fan. He had a newspaper delivery route for a while to help make ends meet; it included anywhere from 25 to 35 miles of unpaved road per day. Really tough on the car--glad he has a REAL job and could let the delivery go.

      Thanks again, and best regards!

      Steve A-






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