92 honda accord lx auto 4dr, LX 4cyl. with original r12 system.
was running warm (last time was recharged in 1997 after a condensor replacement).
anyway, added oil and 14 oz. of r12- runs very cool now.
it blows at 40-42Fat full speed fan and recirc air with a/c on of course - is this in the normal range?
Thanks

 

It sounds normal to me, I do believe however that the actuall measurement also depends on the outside air temp...

 

If you can get 40-42F air from vents w/ outside temps of 85F or higher, I think you're doing about as well as can be expected. I usually measure performance w/ doors & windows closed, Max Fan, Recirculate, w/ engine at 1500-2000 rpm, and car in shade. If you have a sight glass on the receiver/drier you should see no bubbles when compressor is running. Any significant bubbles would indicate a slight undercharge, indicating need for a few more oz's. Charge until sight glass just clears.

good luck

 

I believe the manufacturer states the rated air discharge as the difference between the outside temperature and the rating. (30 degrees rating)
Outside 90 - 30 = 60 degrees discharge.

 

I've never seen a discharge rating, however the "pulldown" is usually measured as air entering evaporator - air exiting ducts. Here a differential of 30 degrees is typical, EG 75-45=30. A really good system can sometimes do a little better than this. How to relate this to charge level is unknown.

Honda shop manual has a graph of Delivery Temp vs. Intake Temp (evap entry). It's linear from (68,42) to (100,78) for 80% humidity and (73,38) to (100,59) for 30% humidity. These are eyeball takeoffsfrom a graph so are probably off by a degree or so on all pts.

regards