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87 740 non turbo ac cold want auxillary fan to work. I shorted out fan and it does work that way replaced switch in radiator nothing according to faqs no relay need more tips thanks 700

posted by  Volm on  Sat Jun 5 04:41 CST 2010
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last visit: Sun Mar 25 06:48 CST 2012
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    87 740 non turbo ac cold want auxillary fan to work. I shorted out fan and it does work that way replaced switch in radiator nothing according to faqs no relay need more tips thanks 700

    posted by  Volm on  Thu Jun 10 13:08 CST 2010
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    last visit: Sun Mar 25 06:48 CST 2012
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    Want to add i had 91 240 ac was ice cold even stop n go traffic auxillary fan worked well w/ac this is how i want my 740 to work again just need info regarding relay / wire etc thanks








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    87 740 non turbo ac cold want auxillary fan to work. I shorted out fan and it does work that way replaced switch in radiator nothing according to faqs no relay need more tips thanks 700

    posted by  Volm on  Thu Jun 10 12:09 CST 2010
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    I read post about relay wire do i splice into ac compressor wire or green wire at receiver/dryer low pressure switch still need more info thanks bob








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    87 740 non turbo ac cold want auxillary fan to work. I shorted out fan and it does work that way replaced switch in radiator nothing according to faqs no relay need more tips thanks 700

    posted by  someone claiming to be bob on  Thu Jun 10 03:32 CST 2010 [RELATED]

    The temp required to close the switch for the fan is something over 200. Wire a relay into the system and use the A/C clutch signal to close the relay








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    Radiator Temp 700

    posted by  spasske on  Wed Jun 9 08:10 CST 2010
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    last visit: Thu Oct 23 10:11 CST 2014
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    The older fans only turn on when the radiator reaches the switch temperature. Mine would only occasionally come on when it was very hot out, I had the AC on, and I was stopped in traffic.

    Since I replaced my radiator last year, I don't think it has come on since. The old one had acquired a coating of cottonwood fluff over the years that reduced its efficiency.
    --
    Paul NW Indiana '89 744 Turbo 145K/ '90 745 turbo 127K








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    87 740 non turbo ac cold want auxillary fan to work. I shorted out fan and it does work that way replaced switch in radiator nothing according to faqs no relay need more tips thanks 700

    posted by  someone claiming to be fixit2002 on  Tue Jun 8 04:01 CST 2010 [RELATED]

    By "shorting out the fan" do you mean you bypassed the radiator switch or jumpered it straight to the battery?? I've seen worn out brushes work when connected suddenly to a battery but not conduct when connected through a relay or some other switching device.







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