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  1. #1

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    Niether radiator fan kicking on...

    Car is a 94 Grand Prix SE sedan, 3100/4T60-E with 139k.

    Niether of my cooling fans are kicking on. The primary doesn't turn on at all, and the secondary doesn't turn on even with the a/c (although niether does the compressor). The coolant temperature sensor near the thermostat housing looks to be new, but I'm not sure if that's the one for the gauge or for the ECM (there were two separate ones if I remember right). Where's the second one?

    BTW--The service engine light was on last week due to a vacuum leak, and the fans kicked on with the light then, so I think that rules out fan relays/fuses/most wiring connections.

    Any ideas?
    2002 Monte Carlo SS 3.8 Series II<br />1999 Grand Prix GT 3.8 Series II<br />1984 Camaro Z28 355/5-speed<br />1978 Jeep CJ-5 Renegade -- who needs pavement<br />1955 House - sucks up all the car money

  2. #2

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    Niether radiator fan kicking on...

    Hard wire the fans and put a toggle switch in. turn the fans an when the car gets warm.
    GP will be resurected from the dead soon!<br /><br />&lt;br /&gt;
    Quote Originally Posted by R Dubya
    You&#39;re about as useful as a cock flavored lollipop.

  3. #3

    Niether radiator fan kicking on...

    The other sensor is either on the intake manifold or one of the heads, probably the back one if its on a head.


    Is your car getting hot enough? Kind of a stupid question but, my old car, while it was a 4 banger, rarely got hot enough to kick on the fans.
    1994 Vert, P&amp;P Heads, Valve Springs, Timed, Alcohol Injected, Bolt Ons, ETC<br /><br />1998 Regal GS NGK plugs 160 stat.

  4. #4
    1990lumina's Avatar
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    Niether radiator fan kicking on...

    Does the aux. fan kick in with the a/c??
    Jeff L. :: 2nd Canadian to win COTM The Preservation for POS W-bodies Canada Chapter
    2004 Acura TSX | 2.4L I4 iVTEC; 5 Speed Auto | 1 of Many Made In '04 | 89,XXXKM
    1990 Chevrolet Lumina Euro 3.1 | 3.1L 191ci 60 V6; 440T4 | 1 of 43,912 Made In '90 | 194,XXXKM
    1985 Mazda RX-7 S | 1.1L 70ci 12A Twin Rotor RE; 5spd | 1 of 63,105 Made in '85 | 130,XXXKM

  5. #5

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    Niether radiator fan kicking on...

    Rule out the coolant fan motors by pulling the relays and jumpering a wire across terminals that correspond to pins #30 and #87 on the relay.

  6. #6

    Niether radiator fan kicking on...

    It has to get to about 3/5th on the guage before the fan(s) kick in. My a/c doesn't work so turning it on doesn't work either..
    <br />[size=7pt]2003 Impala LS&nbsp; _&nbsp; Series II 3800 _ Completely stock with 5x,xxx miles[/size]<br />Leather and roof, clean as a whistle.<br />http://gmwbody.com

  7. #7

    Niether radiator fan kicking on...

    On my car when i switched on ac and just put the ac on full the fans kicked in.

    <br />1993 Chevy Lumina Euro

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