This relates to my 1996 s10 specifically, but the methodology should
be the same for any car AC system.
My 1996 s10 2.2 auto had a slow leak. I had to top it off once a year to
1.5 years or so. Then it was fine. Now, i topped it off and it
sucked down to zero. So now i have a much bigger leak somewhere.
I do have a vacuum pump and gauge set. Last night i pumped it down
and it held at 30 when i took the pump off . This AM it was back to
zero. Before i pumped it down, i changed the two orings to the
condenser. It was a little greasy by them, but it was hard to tell
if it was from refrigerant leak or motor.
So, now i still have a leak after changing the condenser orings.
What is the best leak detection strategy? I see there is red dye,
and UV dye. Any reason to use one over the other? I have a light bulb UV
light, but not a proper AC tool UV light. The compressor was a little
greasy too, but i have not changed the orings on it yet.
I do have a battery sniffer leak detector also, but got it used and am
not sure if it works properly or not. I see the auto parts stores have a
cheapey looking UV light that runs on two AAA batteries. That looks
pretty cheapy to me.
So at this point, what's the best way to proceed? How much of a
charge should i put in to detect the leaks before it all leaks out
What color or kind of dye?
If it is the compressor front seal, how advisable is it to try to change
it? The compressor was working fine otherwise. I know you need a clutch
puller. Do you need a special tool for the front seal? The speciality
tool suppliers list them.
The O-ring connections on the evaporator look clean with no grease on
them. Same with the two on the accumulator. Its hard to tell about the
ones on the back of the compressor.
Last question, O ring color. I thought the green ones were for R134.
It had black ones on it. The auto parts stores had black, green, red and
blue. I put two blues ones on the condenser because that was the only
size O'Rileys had that would fit. Whats the difference between the
colors? Are there black ones now that are 134 compatible?