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    mack048's Avatar
    mack048 Posts: 7, Reputation: 1
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    #1

    Nov 24, 2009, 11:24 AM
    Heat slowly warms truck after being on for a while
    03 ford expedition 4.5, when the truck has been sitting over night after the engine warms up it takes a long time for the heat to actually feel warm coming out of the vents
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Nov 24, 2009, 01:15 PM

    Consider back-flushing the heater core and, possibly, the whole cooling system. If you haven't changed the coolant every 30,000 miles, there may be corrosion in the heater core. Refill with a 50/50 mixture of Zerex G-05 (HOAT) and distilled water. Also, check/replace the thermostat.
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