Question about 1999 Ford Taurus

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Cooling System Problems 1999 Ford Taurus

I've been doing extensive work on my 1999 Ford Taurus. I'm' haveing a problem with the coolant coming out of the expansion bottle after the car is powered down. The coolant rises rapidly and escapes from the neck of the expansion bottle, just under the radiator cap. The cap is brand new. We did a block test and the test came up negative for combustion/emissions gases in the coolant. By-passed the heater core. It has a new Temperature Switch, the relay tested okay, but the cooling fans don't seem to be operating. What else could this possibly be? It's happening after short distance driving, seeming like it's not the radiator. Is there a way to check the fan motor to see if it is bad? Any comments greatly appreciated.

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  • Joseph Weisenberger
    Joseph Weisenberger Jun 21, 2009

    I have replaced the water pump as well. That was part of the extensive work.

  • Joseph Weisenberger
    Joseph Weisenberger Jun 21, 2009

    I don't have a test light, but I do have a multimeter. How would I go about jumping this?

  • Joseph Weisenberger
    Joseph Weisenberger Jun 21, 2009

    Please see thread "Here's a wierd cooling fan issue". This is the most recent thread for this issue. The radiator is okay, measuring a difference of over 20 degrees from the upper radiator hose to the lower radiator hose with the cooling fans not in operation. Now the cooling fans work and the engine is no longer overheating. See that post for the wierd issue.

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My friend had a 1999 taurus and had the same problem, his coolant would leak from around the overflow bottle because the system was backing up. His problem was a partially plugged radiator. I know this probably isnt the news you wanted to hear, but I'm pretty sure thats going to be your problem. sounds like you've replaced everthing else short of the radiator and water pump. Good thing is i remember him saying it was reasonalbly priced, so good luck.

Posted on Jun 21, 2009

  • bwwatson Jun 21, 2009

    to make absolutely sure I would get a jumper wire to make the cooling fan run at all times, without looking at the harness I can't tell you which wires to jump but it you have a test light you should be able to figure it out. once you wire the fan to run constantly if it still over heats then it must be the radiator. If running the fans constantly fixes your problem you have two options. One, carry the car to an automotive electrician and let him check the relays and continuity in the wires going to the fan., or hot wire the fan to a fuse block that only comes on when the key is in the run position. the second of the two options will work, but im sure is not recomended as it can be harder on your fan motor. it's all in how much you wanna spend on the car. I did an contour like this one time and drove the car 2 years before I sold it. Good Luck.

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