new to forum,chuck48,having a/c pro not sure where to start.have good blower w/heat ..nothing on a/c

 

a 92 940 came with an R12 based A/C... has your car been converted to R134a ? volvo sells a kit for this, or various aftermarket things can be cobbled up with varying levels of success. R12 is very expensive and hard to get as manufacture of it was banned 15 or so years ago, as every bit that escapes ends up in the ionosphere where it interacts with solar radiation and destroys the ozone layer that protects us from burning to a crisp.

Personally, I'd check the obvious electrical stuff (does the compressor clutch get powered when the A/C is being switched on?), and if that proves fruitless, I'd take it to an auto a/c specialist and have them do the refrigerant tests, and recharge it if its a R134a system, or convert it if its not. Backyard mechanics are a major contributor to ozone depletion.


no cooling could be from any number of things... lack of refrigerant (R12 or R134a), problems with the a/c compressor (electrical or mechanical). dealing with refrigerant properly involves evacuating the system, leak-down testing it, and only if its fully functional, recharging it.

 

[quote=pierce;279417] R12 is very expensive and hard to get as manufacture of it was banned 15 or so years ago, as every bit that escapes ends up in the ionosphere where it interacts with solar radiation and destroys the ozone layer that protects us from burning to a crisp.


Very expensive, yes. Hard to get? Not particularly. BTW, 134A is on the greenie **** list now, even though it was supposed to be OK a few years ago.
Word is that any new replacement will not be something you can convert your old car to..

 

R134a is being replaced with HFO-1234 or somethinig like that, which is 100% compatible with r134a systems, same cooling factor, same operating pressure, and everything.

Initially HFO1234 will be expensive but as large scale manufacturing plants come online it should drop to about the same price as R134a