[DML] Re: Vacuum questions

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

There is a vacuum resovoir in the same space that the charchol
canister lives in (over the left rear wheel in the pontoon). In fact
you have to remove the canister to get at it. It's main purpose is to
supply vacuum for short periods of time to keep the actuators for the
A/C and heat from moving during acceleration when the vacuum from the
motor isn't available. I would suspect it is leaking and/or not
connected or maybe the check valve is not holding (maybe it isn't even
there). The charchol canister is supposed to trap fumes from the gas
tank when the car is not running. When the motor is running (supplying
vacuum) it is supposed to send the fumes into the motor to be burned.
There is a filter on the bottom. Snap off the bottom of the canister,
the part where the hose attaches, and you will find the filter. You
can get it in the local auto store or just shake it out. Make sure the
hose that attaches to the bottom plastic cover is not plugged up. For
the operation of the thermal vacuum valve in the coolant pipe just
look it up in the Workshop Manual. If you still have the vacuum label
on the underside of the engine cover it shows how it is hooked up.
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> wrote:
> Where -exactly- is the check valve that maintains vacuum for the A/C 
> duct flapper?
> 
> When I firewall the throttle, I lose so much vacuum the flapper 
> shuts, cutting off my airflow. Also, no matter what position the 
> flapper is in when I shut the car off, vacuum leaks and the flap 
> falls to the shut position.
> 
> Also, please remind me of the operation of the thermal 3-port vacuum 
> switch in the coolant distribution pipe:
> 
> 1. Describe the different modes of operation @ different temps.
> 2. 1 line goes to the vacuum advance solenoid.
> 3. 1 line goes to the intake nipple for a vacuum source.
> 4. 1 line goes ????
> 
> How does the charcoal evaporative cannister fit into all this?
> 
> Thanks,
> Rich A.




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