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74 chevy heater/ac

Discussion in 'Trucks and Trailers' started by rdc1534, Apr 23, 2001.

  1. rdc1534

    rdc1534 LawnSite Member
    Messages: 2

    Can anyone give advice on my 74 c-10 when heater is turned on
    i still get some air out the ac vents how do you get at the door that controls this? Chevy shop manual seems very unclear on this to me.
    Any ideas appreciated as I cant see how you get at this mechanism without taking the entire truck apart. Or is that the answer.
  2. mike reeh

    mike reeh LawnSite Member
    Messages: 229

    im pretty sure some air is supposed to come out the dash vents.. thats how it is on mine

  3. 85w/350

    85w/350 LawnSite Member
    Messages: 244

    Air should always flow through the vents I think even in the new trucks it does but maybe not as much. Its part of some type of fresh air system they installed in these trucks so that something like 15%-20% fresh air is always coming in from outside...I'm sure someone can elaborate more on this than i can if this is what you are refering to...it also probably has something to do with why soem air comes out the A/C vents...I dont see how that would be a problem anyway unless your feet just really get cold ;)

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