57-58 Air Conditioning

[Philippe COURANT <accf_clb@xxxxxxxxxxxxxxxx>]

Problem between A/C and non A/C car is (except compressor,
evaporator, condenser etc..) under the dash !
- Non A/C car has a manual air duct / cowl doors  which is
actuates by a lever pedal. Heater housing is different. Also
ducts and  cowl door frame. In fact all the parts are different
...
- A/C model 900 car has an hydraulic operated "recirculating/cowl
door" actuated via the soleno�d (2 doors, one under the cowl
grille and the other behind the plenum chamber / evaporator; the
doors are linked so when one is closed the other is open). If the
soleno�d doesn't work (or if you're in the "heat" toggle switch
position) the cowl door remains open so you've always air coming
from the cowl grille to the ducts, heated or non heated depending
position of temp. lever. When you shutt off the engine it's the
same thing.
When you put A/C on, the solenoid is energised and oil acts on
power piston which opens the recirculating door (and closed the
cowl door). Interior air of the car passes through this door,
cooled by the evaporator and is distributed through the air
ducts. You could also add heated air if you push the temperature
lever to "warmer".
So Hugh, don't worry, you'll always have exterior air in your
car: plug the line coming from the "T" to the solenoid. But if
you want a working A/C, you must have a working power piston. and
new lines..


--
Philippe COURANT (Pau, France)
Imperial 57 Crown convertible
Buick 58 Roadmaster sedan

- American Car Club de France (ACCF) : http://www.accf.com

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http://www.ifrance.com/accf-cad

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