Fan resistor

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jrreeve
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Fan resistor

Post by jrreeve » Sat Oct 13, 2007 8:05 pm

Hey all, i've just been messing with the car lately (getting read to sell it!) :( . I noticed the resistor for the heater fan on the firewall today. That only controls speeds 1 and 2, correct? What controls the high speed on the heater fan? My memory is hazy on this one, isn't it wired direct, anyone remember what color the wire is? I don't seem to have the high speed on it, which isn't making sense to me. The wiring diagram is a bit of a nightmare.

Thanks,
Rob
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x-rad
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Post by x-rad » Sun Oct 14, 2007 7:25 am

kinda of complex but:

red from fuse 7 to common on fan switch
then distributed to low, med, or high

if on high setting, then yellow out of switch directly to fan

if medium, then yell w/black out of switch to middle section of resistor, then yell w/black back to common junction at high section of switch, then to fan (on common line which becomes yellow on the way to fan)

if on low, then purple out of switch, changes to pink at connector, then to resistor end, back out resistor using yellow w/black back to fan switch to the high setting line (common line which becomes yellow on the way to fan)

the power out from resistor is a shared line which joins the high line to fan at switch. basically shares power directly from three sources, two from common yell/black from resistor and one directly from 12 source through switch.

since all power comes from fuse 7, it is probably a switch problem if you don't have high speed

this from wiring dgm 1984...
Frost
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Re: Fan resistor

Post by Frost » Mon Feb 09, 2009 9:40 am

Please HELP,I have a 75 twinnie and no owner manual or any published material for the car and the fan doesnt work at all e.g no fan speed works,its a non AC car and Ive checked all fuses,they are fine :?
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Maurizio
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Re: Fan resistor

Post by Maurizio » Mon Feb 09, 2009 10:22 am

Frost wrote:Please HELP,I have a 75 twinnie and no owner manual or any published material for the car and the fan doesnt work at all e.g no fan speed works,its a non AC car and Ive checked all fuses,they are fine :?
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floridamary4
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Re: Fan resistor

Post by floridamary4 » Tue Jul 06, 2010 4:44 am

thanks for postings :)

Heating Repairs
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