This is a learning situation for me - AC 101 - so, I apologise if I become trying.
(I don’t know history of car. 'Twas not abused but more the case of being overlooked.)
The gauge on the auto parts store can of refrigerant (low side fill) did not register any pressure at all. Needle didn’t even blip.
Since the pressure gauge needle did not move,
a) If system is compleatly void of refrigerant, then, one 20 ounce can of refirgerant may not be sufficient to obtain a measureable amount of pressure given the “can” equipment I had. Nope - not at this time do I want to spend money of additional refrigerant. Maybe some diagnosis, first.
b) I am guessing the compressor is not working because the few leaks my cars have had were slow leaks. So, a working compressor should have shown a pressure bleed-down reading on the gauge. Also guessing it would have to be a massive leak - unusual ?- to allow the can of refrigerant to vacate to atmosphere seemingly immediately.
- Is there a way to attempt to test-pressurize the system - say by compressing all that free air in the atmosphere - to determine if there is a leak ?
- In my ignorance of AC systems, I a thinking the lack of pressure is either i) failed AC compressor or, ii) leak to atmosphere. So then, I should press ahead and replace the compressor (and receiver/dryer ?) and attempt to fill the system with refrigerant-leak dye and see what’s what. Question: Is there any component other than the AC compressor the failure of which would cause zero pressure ?
- I am going to continue poking around the internet for S Type specific diagrams and trouble-shooting procedures but, if anyone can point me to information, I’d appreciate it.
nb: I had to engage the clutch by by-passing Relay No. 8 and jumping terminals 3 & 5.
All the best,
Greater Chicago Metro, U.S.A.