Question about 1998 Buick LeSabre

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No air coming out of dash defrost floor ok - 1998 Buick LeSabre

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  • dansblasting Sep 01, 2010

    tracked vac hose to manifold behind glove box good vac there .now were do i look

  • dansblasting Sep 01, 2010

    good vac. to vac. manifold behind glove box where to now?

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There is a vent flap inside the venting system behind and up under the dash board. The vent flap can get stuck or the actuator that moves it can become faulty.

Posted on Sep 02, 2010

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Renew the small vacumn pipes that come from teh inlet manifold to the operating flaps on the heater /AC unit ,start at manifold and follow them ,i think one has a split end so no vacumn and the operating flaps will not open or cl?ose correctly causing exactly the problem you describe

Posted on Sep 01, 2010

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03 mercury grand marquis hvac air flow .-13qahwfdndst2y1hypmr2cdq-4-0.gif Item Part Number Description 1 18A318 Vacuum control motor-floor/defrost door 2 - Defrost air flow 3 18A478 Floor/defrost door 4 18476 Heater core 5 19860 Evaporator core 6 19805 Blower motor 7 - Outside air inlet 8 19A813 Air inlet door 9 18A318 Vacuum control motor-air inlet door 10 - Recirculated air inlet 11 18B545 Temperature blend door 12 18A559 Panel door 13 - Panel air flow 14 18A318 Vacuum control motor-panel door 15 - Floor air flow 16 - Vacuum from the engine intake manifold 17 19A563 A/C vacuum check valve 18 19A566 Vacuum reservoir tank and bracket 19 19980 EATC control
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vacuum lines hvac 03 grand marquis-13qahwfdndst2y1hypmr2cdq-4-2.gif Item Part Number Description 1 White Air inlet door 2 Yellow Floor/defrost door 3 Red Floor door 4 Blue Panel door 5 Black Source vacuum 6 - Not used


VACUUM APPLICATIONS CHART-ELECTRONIC AUTOMATIC TEMPERATURE CONTROL Switch Port Vacuum Harness Hose Color Func- tion Manual Override Selector Buttons OFF MAX A/C NORM A/C VENT FLOOR FLOOR/ DEF DEF 1 White Air inlet 2 Yellow Floor/ panel (partial) 3 Red Full floor 4 Blue Panel 5 Black
Source

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