Re: [DML] Fixed my AC! +observations/questions

[mike.griese@xxxxxxxxxxxxxxxx]

The purpose of the A/C control system is to get the system into steady 
state - that means getting all of pressures in the system to the correct 
values.  The only tool the system has to do that is the compressor and
control of the compressor's duty cycle - the amount of time the compressor 
is running or not.  There are two other controls that affect the system.
The temperature of the air moving through the condensor at the front
of the car and the temperature and amount of air moving across the
evaporator in the heater box.  

The cabin blower takes warmer outside air and forces it over the evaporator.  
This cools the outside air before it is blown into the cabin.  It also removes
moisture from the air.  The cooling of the air causes the freon in the evaporator
to heat up and evaporate, changing the pressure in the system.  The A/C 
control system senses this and tells the compressor to do it's thing.  If the cabin
blower is not running, it takes a lot longer for the A/C system to change state 
enough that the compressor needs to run again.  

--
Mike


-------------- Original message from "Nathan Sobieralski" <valleyrat12@xxxxxxxxx>: -------------- 


> That all makes sense but why does the compressor cycle at idle with the 
> blower fan on but stops cycling with the blower fan off? (The cabin air fan) 
> 
> Nathan 
> 
> 

[Non-text portions of this message have been removed]





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