Question about 1999 Mercury Cougar

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99 couger 2.5L 6 Cyl-temp gauge maxing out, overheating

I changed the thermostat out and it still over heats. Any suggestion?

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  • marty_pelkey Feb 16, 2009

    please explain bleed system. do you mean remove a heater hose to bleed air? or just turn the heater on and it will bleed system?

  • marty_pelkey Feb 16, 2009

    Thank you for the great explainatoin!! I will try.

  • Anonymous May 01, 2009

    I have a 1999 Cougar 2.5 and the temerature gauge contantly keep going up. theres alot of pressure building up, but it holds the pressure and theres no leaks. Please help

  • Mike Butler
    Mike Butler May 11, 2010

    Bled system properly with heater (not defrost) on, and your rad fan is working as it should?

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  • Mercury Master
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I will normally remove rad cap when cool. Start engine, set heater in car to heat & turn on blower, if you use defrost setting, the rad fan &/or AC fan will come on, and you don't want that. Then while running with cap off, make sure coolant in rad is an inch or 2 from top of rad, and let it run. When engine gets to normal operating temperature on the gauge, you'll start to see more flow in radiator, and rad fan should come on shortly after, to cool the incoming hot liquid in the rad, that tells you the thermostat opened as it should, and the process starts again, engine coolant gets to temp, thermostat opens, hot goes to top of rad for cooling, and cooler liquid goes out the bottom to engine, etc etc. If your heater is not on while doing this, the coolant doesn't get to heater core in most cases, thus creates an airlock, or will cause level in rad to go down when it is turned on, and thus reduces amount of coolant in rad, plus airlocks in the entire system. So, let it run to the point that the rad fan comes on & off on it's own, about 3 times, while you watch the gauge, to make sure it doesn't overheat, if it does, shut it off and let it cool down & try again. if all appears good, top rad up if needed to an inch or so from top, put your cap on properly, add coolant to proper level in return bottle & try it and see what happens. Remember though, I am assuming thermostat was put in correctly, rad in good shape, fan is working properly as well as water pump doing it's job. If this method doesn't work, get back to me with results.

Posted on Feb 16, 2009

  • Mike Butler
    Mike Butler Feb 16, 2009

    Your welcome, keep me posted on results.

  • shelleyrthom Jun 23, 2011

    mine did the same but no heat blows and still over heats help

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Just give the dashboard a good bash on top of the temperature gauge, and you'll see the needle go back to the correct spot. It is very possible your gauge is malfunctioning, like mine was.... out of frustration one day, I just bopped it and it corrected itself. I may now just go and get a good mechanical (not electrical) aftermarket gauge and mount it on the window column (A column)

Posted on Jun 18, 2009

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