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    larryrhodes2's Avatar
    larryrhodes2 Posts: 1, Reputation: 1
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    #1

    Nov 2, 2009, 09:50 AM
    No heat to floor
    2000 chevy s10 blows air through defroster and dash vents but not to floor in any setting
    How so I fix, please
    RickMN's Avatar
    RickMN Posts: 244, Reputation: 52
    Full Member
    		  
    #2

    Nov 3, 2009, 07:56 AM

    The "mode doors" control where the air is directed. There are 4 vacuum motors on the heater box. The motor that controls heat versus defrost has a red and blue vacuum line going to it. Use a hand vacuum pump to operate the motor to see if it's working properly. Apply vacuum to each side, one at a time with the blower running to see if it switches modes. Also, check to see if the motor holds the vacuum.

    If the motor doesn't change the mode or the motor doesn't hold vacuum, replace the motor. If the motor checks out OK, then you have a vacuum leak in one of the lines or the switch at the dash.
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