Question about 1999 Ford Taurus

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Car running hot, fans operate only in park

I also have a 1999 Ford Taurus with the 3.0L V6 Vulcan OHV engine. My problem isn't in the water pump (I know this because it's only about three months old). The thermostat is also new, as is the coolant temperature sensor (temperature switch or Engine Coolant Temperature Sensor) and the pigtail/wiring harness that connects (I found a burnt spot in the wire that goes to the pigtail and made sure to connect the new harness to an area that has good continuity), the radiator cap is less than three weeks old, and the heater core has been bypassed. The cooling fans operate, but seem to only happen when the car is placed in park. I have driven about quite a bit, and never heard the fans come on while at a stop light or stopped in traffic, but pull into a parking space and place the car in park, within just a couple of seconds the fans start to run. I have recently noticed a small pool of coolant on the lower left corner facing the engine of the coolant recovery tank. There is a trail of coolant that comes around the edges of the raised portion as well. If this is leaking, could this be causing a problem with the fan? If I disconnect the CTS so that the fans run continuously, I have no problems with the cooling system, but if I plug it back in, the fans only operate while in park. I can turn the engine off after driving (the fans kicking on shortly after placed in park, and kicking off as soon as the engine is killed), then the coolant rises rapidly in the recovery tank, steams, and overflows like a glass left too long under a running faucet from the recovery tank filler neck, beneath the radiator cap.

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  • Joseph Weisenberger
    Joseph Weisenberger Jun 28, 2009

    This is a great lead, but unfortuneately inapplicable to my specific model year. I know that I have problems with my A/C, but I'm not sure what it is. I've never used it, but I'll look into it. The 1998-2001 model years did away with the CCRM that contains the relays for the fan and the A/C. They're replaceable individulally in the 1998-2001 model years and are located in the Power Distribution Box.

  • Joseph Weisenberger
    Joseph Weisenberger Jun 28, 2009

    Did find a smaller black box where the CCRM is located on the 1996-1997 Gen II. models. It's not a CCRM but has a box with 7 replaceble relays inside and a large spool of wire-looks like it connects in the negative battery cable, but I could be wrong-coming from the other side. The top is simply a lid-plastic with two clips so that you can remove it. One large relay at oriented close to the front of the engine compartment and six smaller relays paired as they go back to the rear of the engine compartment.



    __________ _____ _____ _____

    | | |_____| |_____| |_____|

    | | _____ _____ _____

    |_________| |_____| |_____| |_____|



    Not sure what these relays control, but will be researching this as well.

  • Joseph Weisenberger
    Joseph Weisenberger Jun 28, 2009

    Wow, disregard the diagram, did not show up like I had hoped.

  • Joseph Weisenberger
    Joseph Weisenberger Jun 30, 2009

    Thanks, Roniecon, I heard that eariler today from a mechanic friend of mine (just before I read your post)

  • Joseph Weisenberger
    Joseph Weisenberger Jun 30, 2009

    Looks like I finally figured this one out. It seems that it was the high speed cooling fan relay, and the reason that it would operate only in park was because it was sticking and the shifting in the engine compartment from drive to park would make it slip free and make contact. I put the relay from the Driver's Side Window into the first large square relay in a relay box (unlabeled and no information in Haynes' or the Owner's Manual, I have another next to the GEM that I don't know what goes into it, nor do I know the other six that go here) located on the driver's side of the battery. The fans started kicking on in every gear (P, R, N, D, (D), and 1). I let the fans cycle several times (about a 30 second duration when stopped-no matter what gear) and drove to the cigarette store. My girlfriend kept the car drive but kept her foot on the brake while I bought the smokes (the fans cycled a couple times while I was inside) and we drove back home. The coolant didn't overflow, but I think I found a crack in my expansion tank. Could help explain all the steam I've been getting. But anyway, it seems things are working now. I'll be checking the ground wires soon... over 104 degrees here today.

  • Joseph Weisenberger
    Joseph Weisenberger Jun 30, 2009

    The relay is one that replaces the relays in the CCRM. Could be why it's wierd for it to be situated in such a way.

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  • Ford Master
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Also check for ground to engine to body/////

Posted on Jun 29, 2009

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 30, 2009

    i was thinking of this problem and the more i think about it it does happen more than u hear abount ,,but in park i think the cooling fans are some how running on ground backfeed,the relays do energize on ground ///this would say bad ground possibley body to engine ?u say the fans run constant,,,do u know the exact temp when these fans have beenon say 3 minutes? do u have a gauge in the car? is it below normal? jus t a thought try ground toframe to eng,to body let me know

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  • Master
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Does your ac work? When you turn on your ac, all the fan should be working at all times. See if they remain on when you are driving. If they go off. check the CCM module located in front of the vehicle, it is a metallic box usually black in color not to far from the radiator. I can't remember if it was the right side or left side of the radiator. The inside of that box has electronic circuit which also drive the compressor directly. You really can't test this box, the only thing you can do is visually check it for burnt components inside. I had to repair this box on my 96 taurus because a transistor inside was open that drive the compressor clutch solenoid. I belive this box also controls the fan. Unplug the connection to this box, to see if it affects the fan by turning it off or on. Make sure the key is on tho. when you check it.

Posted on Jun 28, 2009

  • Ronado Panaligan
    Ronado Panaligan Jun 30, 2009

    If your AC is charged and not turning on. The fan issue maybe related. I wish I was there to help you out, altough we would need an schematic. If you can somehow get the schematic for that car you maybe able to solve the problem yourself because it seem you know a bit about cars as well.

  • Ronado Panaligan
    Ronado Panaligan Jun 30, 2009

    Well I would like to congratulate you on fixing the problem, It is not normal for a relay to be situated that way so i am sorry that i was not able to help you much. Thanx anyways.

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