Question about 1994 Ford Thunderbird

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94 t-bird, 4.6 L is overheating. temp spikes and then goes down then spikes again, has ran hot once. replaced fan and thermostat

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  • Pat Mor Sep 07, 2009

    no, haven't had to replace coolant, low coolant light comes on occasionally then goes off but it is not low

  • Pat Mor Sep 07, 2009

    how do you bleed it?

  • Pat Mor Sep 07, 2009

    no, didn't have heater on. another funny things happens with the heater and ac. sometimes ac works blow really cold air then it will change to hot heat. heat will do the same thing in reverse. does this have something to do with it and bleeding the system?

  • Mike Butler
    Mike Butler May 11, 2010

    has it been bled(air out) properly when coolant refilled?

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  • Ford Master
  • 1,564 Answers

Your radiator core may be corroded or built up inside with deposits. Try flushing the system and take a good look around the core with a flashlight in side the fan shroud.

Posted on Sep 07, 2009

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  • Ford Master
  • 6,674 Answers

Make sure you run engine from cool with cap off, and heater on when bleeding. Was heater on after you did thermostat ?

Posted on Sep 07, 2009

  • Mike Butler
    Mike Butler Sep 07, 2009

    With heater off, it's not uncommon for airlock to develop in system. You may even see level go down when cap off & heater on, once system starts to circulate through when thermostat opens. Your problem with heat & cool sounds more like a blend air door or vacuum problem in the system.

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