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HVAC problems

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Jonny-K5, Mar 30, 2006.

  1. Jonny-K5

    Jonny-K5 1/2 ton status

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    when i turn the HVAC lever to defrost, the AC pump comes on. where should i check first? faulty unit in dash?
     
  2. Smitty

    Smitty 1/2 ton status

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    Sounds like it's working the way it was designed. The A/C takes the humidity out of the air and assists in the defogging process.
     
  3. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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    Yep, that's the way it's supposed to work, in order to help defog better. It also has the side effect of keeping your AC compressor from sitting idle all winter and ensuring that your AC system circulates lubricating oil.
     
  4. Jonny-K5

    Jonny-K5 1/2 ton status

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    really? huh, learn something new every day...
     

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