I have a 2001 2500 Cummins td with 6-speed manual. A/C worked last fall,
now it does not.
Clutch did not engage, indicating low pressure.
I have the manifold guages and an adapter to tap the can of R-134a. I
connected it up and the pressure was low and the same on high and low
side. I tried to charge with a can of refrigerant and the clutch on the
compressor now engages for very short periods - a few seconds, but it
does not seem to want to take a charge.
The R-134a can is upright - correct?
Do I need to evacuate the system before charging? I looked at a vacuum
pump (pneumatic) at Harbor Freight last week, but it had an R-12
connector on it, so it did not seem as if that would do much good.
Maybe they rent these at Checker Auto?
I have had good luck charging the older R-12 systems with hydrocarbon
(alcane) refrigerants. In this case you do not evacuate the system and
you hold the can upside down. I can use the same refrigerant on this
truck but since it is designed for R-134a and I can buy this readily, I
would like to stick with the right stuff.
Any advice on stop-leak?
Thanks for any advice,