Is this true??

Discussion in 'The Big Chill' started by SCOTTFISHER, Feb 17, 2009.


    SCOTTFISHER Well-Known Member

    Let's say your heater is working properly.

    Your AC compressor does not work.

    Your front interior windshields steams up w/ the heater.

    Does the compressor work in conjuction with your heater when it's on?

  2. DaWildcat

    DaWildcat Platinum Level Contributor

    Scott, it depends on the year/make/model of the vehicle. Many engage the compressor by default when "defrost" is selected.

  3. buick64203

    buick64203 Just plum crazy Staff Member

    Sounds like your heater core is leaking.

    SCOTTFISHER Well-Known Member


    It's just that it takes so long to get rid of the windshield moisture.


    If the compressor doesn't engage would this be a symptom?
  5. buick64203

    buick64203 Just plum crazy Staff Member

    If you get steam coming out of the defroster vents when you turn it on, the heater core is more than likely leaking. Most of the time you can smell it. Smells almost sweet coming out of the vents. And the fog has a slimy-ness to it if you try and wipe it off.
  6. jdk971

    jdk971 jim karnes

    bad heater core.
  7. Racerx88

    Racerx88 Platinum Level Contributor

    If you're talking about a '71 Skylark with a/c, then yes, the a/c compressor should engage when you turn the controls to "defrost". If the compressor does not work, then all you're doing is blowing more moist air at the already wet windshield. It will eventually dry out as the air in the car circulates, but it will take a long time, just like what you're describing.
  8. Fox's Den

    Fox's Den 27 years of racing the same 355 Buick motor

    My 71 had air on it and I know for sure that the compressor did not turn on with the defrost. I would feel around on the floor on the passenger side to see if it is wet there. Sounds like your heater core is leaking. The other thing to check is that there is a vent hole at the bottom of the part the has the air conditioner coil and maybe there is water in there that is not getting out. Crawl under the pass. side and look up and you should see a small boot there that lets water out from the air conditioner system. This may be plugged up and not letting the water out. Otherwise I would say the heater core is leaking. Check the rad and see if the water is going down.

    SCOTTFISHER Well-Known Member

    Yep "racer" I do have the ac compressor out at this time.

    Sounds like it may affect the defrost when on heat control.

    I didn't know they were related....until recently someone told me that.

    Thanks, appreciate everyones help!

    See I knew we could be friends.

    BUICKRAT Torque Rules!

    Either the drain is plugged or the heater core is leaking, probably both.

    We cannot be friends until you stop talking in bold caps.:moonu:
  11. chris roesch

    chris roesch Say what again, i dare u

    the alternative is to not breathe so much

    SCOTTFISHER Well-Known Member

    I don't smell anything sweet, nor do I see anything leaking, but will have to crawl underneath shotgun side and attempt to look near the heater core.

    Oh yea, the reason the compressor is out is because the clutch has frozen up.

    Last edited: Feb 18, 2009
  13. V8s4ever

    V8s4ever Well-Known Member

    You do not need the A/C comp to run to defrost your windshield.It does help to defog the inside when it is very damp and humid but check your outside/recirc door to make sure it is open to outside air.If it is stuck open to recirculate inside air the air will have too much humidity and will condense on the cool windshield.
  14. Fox's Den

    Fox's Den 27 years of racing the same 355 Buick motor

    :gp: I for got all about that one. The window will fog up if the system is on recirculate. maybe there is a vacume line off somewhere. there is the canister outside on the firewall maybe the hose came off.

    SCOTTFISHER Well-Known Member

    What kind of canister? Vacuum hose? Thanks
  16. Fox's Den

    Fox's Den 27 years of racing the same 355 Buick motor

    There is a canister that is on the firewall above the voltage regulator. There is a hose that goes to it that is connected to the engine vaccum and the other end goes into the car to the heater control in the dashboard. When you put the switch on recirculate you can hear the air go to the proper door to open or close it to operate the proper system. This needs to all be working or the recirculate door will stay open and you will just get recirculated air. The canister is round and about the size of your fist. This holds the air to operate the heater system.

    SCOTTFISHER Well-Known Member

    Do you mean the vacuum pod? One hose is larger than the other.
    If this is it I do have it presently disconnected.
    Last edited: Feb 20, 2009
  18. buick64203

    buick64203 Just plum crazy Staff Member

    Do you have any heat in the car? With that disconnected, cold air should be coming out and not heat

    SCOTTFISHER Well-Known Member

    Yep, I do have heat.
  20. Fox's Den

    Fox's Den 27 years of racing the same 355 Buick motor

    That sounds like the part try to hook it up and see what happens

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