Question about 1997 Lincoln Continental

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Climate controls just replaced the climate control on my lincoln and everything work except it won't change where the air blows out from. It only blows from defrost, any ideas?

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  • Bird3345 May 21, 2009

    Thanks for the help, it was a missing vacuum hose under the hood replaced it and now all is good with that anyway...

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Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.

Posted on May 21, 2009

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  • jg1523 May 21, 2009

    Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.

  • jg1523 May 21, 2009

    Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.

  • jg1523 May 22, 2009

    You're very welcome. Please rate my solution as you see fit.

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  • 156 Answers

Probably missed a vacuum line under dash

Posted on Nov 11, 2012

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Defrost is the failure mode to insure the windshield always gets air.

you have a vacuum problem. The vacuum comes from the engine through a small hose and connects to the control head you replaced. There is also a storage canister in the engine compartment to stor vacuum when going up steep hills to maintain vacuum to the heater controls.

  • Vacuum control motors (18A318) are used to control each of the remaining air distribution doors.
  • Sometimes the hose gets cut or the storage canister leaks.

    Did you connect #15 back up when you replaced the part?
    "source" is the engine. #13 is the reservoir
    ---------------------------------------------------
    climate controls - 1f41c37.gif
    Item Part Number Description 1 18A318 Windshield Defroster Door Vacuum Control Motor 2 18A478 Windshield Defroster Door 3 19C722 Supplemental A/C Air Temperature Control Door 4 19A842 Primary A/C Air Temperature Control Door 5 19A814 Supplemental A/C Air Inlet Duct Door 6 19N619 Pollen Filter 7 18A318 A/C Air Inlet Duct Door Vacuum Control Motor 8 18731 Heater and A/C Air Inlet Duct Door 9 18527 Blower Motor 10 19860 A/C Evaporator Core 11 18476 Heater Core 12 — Secondary A/C Air Temperature Control Door (Part of 19B555) 13 19A566 A/C Vacuum Reservoir Tank and Bracket 14 19A563 A/C Vacuum Check Valve 15 — Vacuum Harness 16 18752 Heater Air Damper Door 17 18A318 Heater Air Damper Door Vacuum Control Motor 18 19A901 Supplemental A/C Damper Door (Rear Console A/C Registers Only) 19 18A318 Supplemental A/C Damper Door Vacuum Control Motor
    Item Part Number Description 1 18A318 Windshield Defroster Door Vacuum Control Motor 2 18A478 Windshield Defroster Door 3 19C722 Supplemental A/C Air Temperature Control Door 4 19A842 Primary A/C Air Temperature Control Door 5 19A814 Supplemental A/C Air Inlet Duct Door 6 19N619 Pollen Filter 7 18A318 A/C Air Inlet Duct Door Vacuum Control Motor 8 18731 Heater and A/C Air Inlet Duct Door 9 18527 Blower Motor 10 19860 A/C Evaporator Core 11 18476 Heater Core 12 — Secondary A/C Air Temperature Control Door (Part of 19B555) 13 19A566 A/C Vacuum Reservoir Tank and Bracket 14 19A563 A/C Vacuum Check Valve 15 — Vacuum Harness 16 18752 Heater Air Damper Door 17 18A318 Heater Air Damper Door Vacuum Control Motor 18 19A901 Supplemental A/C Damper Door (Rear Console A/C Registers Only) 19 18A318 Supplemental A/C Damper Door Vacuum Control Motor


    Posted on May 21, 2009

    • gerry bissi May 21, 2009

      your welcome. please rate as problem solved for me. thanks.

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    On the back of control unit there sould a plug with vacum lines check to make sure it is connected tight if it is ok there are several vacum accuaters under the dash or behind ther glove box I'm not sure which is for what on your model but as you switch hot to cold one sould work when you change a/c from max to reg anther should work the last controls where the air flow comes out if the last one doesnt work check it for vacum when changing controls aslo check to make sure that the lever moves some what freely you may have to disconnect the linkage to check but most likely the actuator is bad these are not usually that expensive good luck let me know how you make out

    Posted on May 21, 2009

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