2000 Deville with HVAC draining issues
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1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2000 Deville with HVAC draining issues in Past Cadillac Vehicle Discussion; I have a 2000 Deville with 154K miles on it. When the car is operating at normal temp and you ...
  1. #1
    cadillac-dude is offline Cadillac Owners Member
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    2000 Deville with HVAC draining issues

    I have a 2000 Deville with 154K miles on it.

    When the car is operating at normal temp and you turn on the A/C the EVAP drain plug on the firewall starts a constant drip. If you switch on the heat the EVAP drain plug start to trickle non-stop. The fluid is clear and cool to the touch. If you run the car with the heat and a/c off no drip. Heater core clogged?

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    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: 2000 Deville with EVAP draining issues

    Quote Originally Posted by cadillac-dude View Post
    I have a 2000 Deville with 154K miles on it.

    When the car is operating at normal temp and you turn on the A/C the EVAP drain plug on the firewall starts a constant drip. If you switch on the heat the EVAP drain plug start to trickle non-stop. The fluid is clear and cool to the touch. If you run the car with the heat and a/c off no drip. Heater core clogged?
    ------------------------------
    no - it sounds like everything is working PERFECTLY -

    with the AC compressor running -
    whether you are heating or cooling the cabin -
    you are removing moisture from the cabin air -

    that moisture is what condenses on the evaporator - plain water -
    and falls to the drip tray - and drains out the drain hose - to the ground -

    when you turn the AC off -
    moisture is no longer being removed from the cabin air -
    so nothing drips onto the tray - and there is nothing to drain out -

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2000 Deville with EVAP draining issues

    Perfectly normal ............... depending on ambient temperature and relative humidity the condensate drainage will be more or less ...... normal.

    Be glad that is IS dripping - quite a few members have water noises in the HVAC stack and a plugged condensate drain is the most common cause.

    Technically, EVAP is the fuel tank vapor purge/pressure sensor system - an emissions system. The drain of which you speak is the HVAC evaporator sump drain.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2000 Deville with EVAP draining issues

    Good point. I'll edit his title.

  6. #5
    cadillac-dude is offline Cadillac Owners Member
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    Re: 2000 Deville with EVAP draining issues

    Thanks. Glad to hear this is normal. It is very hot here (95-100) with very high humidity sometimes in the 99% range.

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