Type85 AC converions to R134a

[Louis-Alain_Richard at computerhorizons.com]

... and don't forget why there is a sensor there (at the coldest point of 
the evaporator): it's main, if not unique, reason of being is to prevent 
the freezing of the evaporator. If you adjust it _too_tight_, there will 
be an ice buildup over the evaporator and then the airflow will be slowed 
dramatically, resulting in less cold air coming out of the vents. 
Obviously, this behavior is more present in damp areas, so maybe this is 
irrevellant if you live in the desert...

For Renault (for which I work now, guess on what part of the car? The AC 
system...), the AC dash outlet temperature must be "less than 10 degrees 
Celsius (50F) in less than 1 minute" for an outside temp of 25C (77F). 
Then the system is OK.

Louis-Alain






> Remember the sensor
> measures the temp of the evaporator itself,

Agreed. But most people measure the temperature at the vents using a
household thermometer. So the actual surface temperature of the evaporator
could be significantly different.

> so just adjust
> it to cutoff before it reaches 32* and you'll be fine.
>

Perhaps. But generally with the factory setting for these switches, with 
the
original refrigerant, the compressor should be cycling at a nominal 40F
measured at the vents with the system stabalized (windows up, max AC for 
~10
to 20 MINUTES) at average, shaded, ambient conditions (not 95F with the 
car
in the sun). And while settings lower than this may give you certain
bragging rights. I'm not sure there's any practical value to it. Unless...
Are you a butcher by trade? ;~)
Steve