Question about 1990 Ford F150

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I have a 1990 Ford f-150 XLT 4x4 with a 351W 5.8L engine. I replaced the water pump, thermostat, radiator, and cap. Now the antifreeze is being pumped into the overflow tank to where it is overflowing. The heat inside the cab has also gradually faded to cold air. Does anyone have any ideas or suggestions as to the problem?

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  • mckeek3223 Feb 20, 2009

    I have tried this a couple of times. When the vehicle warms up the antifreeze wants to spew out the top of the radiator. The inlet hose on the heater core hose gets hot but the return hose just gets luke warm at best. Would a flush and backflush of the system help?

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Run engine from cool, with rad cap off & heater on heat (not AC) and watch for circulation through rad when engine reaches normal operating temperature. Rev engine slightly from time to time for a couple of seconds, to increase flow & help bleed air out of system. Let it run for a while, and watch for increased flow in rad 2 or 3 times. Probably see air bubbles at same time.Hot coolant from engine comes in top, and back out bottom to engine after cooling in rad. The increased flow in rad ,indicates thermostat is opening & circulating cooler liquid back into engine. After 2 or 3 times put cap back on & fill return bottle only to line specified as warm/hot engine level.

Posted on Feb 20, 2009

  • Mike Butler
    Mike Butler Feb 20, 2009

    A complete flush wouldn't hurt yes, but have you checked for a flow valve in line(hose) to heater core that may be malfunctioning also. If yes, try removing it and inspecting it, and if necessary, use a piece of copper pipe or similar in place of it to join hose ends with couple of hose clamps temporarily to try it. Did engine get overheated in past by any chance, that may have caused head gasket leakage/damage?

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