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    fighter2000's Avatar
    fighter2000 Posts: 1, Reputation: 1
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    #1

    Nov 9, 2010, 10:48 AM
    98 S10 heater hot when parked and when I drive it the air turn cool
    I have a 1998 S10 2.2. When the truck sits at idle, I have heat, but when I drive it the air turns cool. Also when I take the radiator cap off there is no pressure in the radiator . I have replaced the thermostat, clean out the heater core.
    Joelin's Avatar
    Joelin Posts: 9, Reputation: 2
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    #2

    Nov 11, 2010, 07:49 AM
    Sound like is the water pump and you should test the temperature switch. If you don't have pressure, water pump are bad... Good Luck
    I have 2000 s10 http://www.youtube.com/joelin66
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