Re: [DML] Re: Ah, the great R12 vs R134 debate... To:dmcnews@yahoogroups.com

I believe Mr. David Teitelbaum is correct on this one. Air condition and 
refrigeration systems must be properly done with good equipment, especially, 
the evacuating pump for the COMPLETE evacuation of atmospheric air in a 
system. The cheaper or a weaker pump will not do it properly.

On the same breath, there are "hidden and long range damages" that can occur 
from not evacuating the system properly. If I am not mistaking and if I do 
remember the facts that I was taught, moisture which is actually atmosphere 
air composed of different gases and when it is mixed with freon in the closed 
system, it will turn in to hydrochloric acid and it will corrode your system 
from inside out. This will lead to premature failure of the hoses and all 
the components, especially the aluminum units such as your evaporator and 
condenser. So, a decent evacuating pump if a must. Every bit of minuscule of 
air must be removed! 

Also as a rule of thumb, when a system is opened, as in a rupture, or a 
component failure and when replacing the part or parts, the RECEIVER DRIER or 
the DESICCANT BAG MUST BE CHANGED! Then immediately evacuate the system with 
a REAL or an able commercial vacuum pump for at least a minimum of 20 minutes 
and the longer evacuating, the better. One hour is best for an average car. 
Afterwards, turn off the pump and do check your gauges to make sure the 
system is sealed and holding vacuum, with no leaks. 

With the pumps off and all valves shut, the gauges MUST be holding and 
reading a complete vacuum with no movement in the gauges at all! Only then, 
you can fill the system with the required type and the proper amount of 
freon. If the gauges shows even a hair line of movement, it is an indication 
of a leak, DO NOT FILL, for it is waste of the freon. You MUST check the 
system again, to FIND and to CORRECT the leak or leaks in the system BEFORE 
FILLING with the CORRECT AMOUNT, by USING the gauges and the PROPER STEPS to 
introduce the freon into the system, with no ands, ifs and buts about it. Do 
this correctly and you should have NO problems with your A/C system.

BTW, With some present cars and older cars, they have a "sight glass" which 
is dedicated to that car's system. This sight glass is usually the best 
indicator, for it shows "sight on seen" the amount of freon in the system 
when the A/C is turned on. Bubbles means the system is low, clear means 
fully or over charged or empty. The DeLorean does not have a sight glass, so 
you have to depend on the gauges, unless, you add one onto the system for 
your own conveniences.

Kayo Ong
#5508
Lic 9D NY


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