Alfa Romeo Forum - View Single Post - 1996 Alfa 164 Super 24V

Avocet · 06-05-2008

The sight glass that you refer to on the receiver / dryer unit is a throwback from the days of R12. It was a sign of a healthy system to see the odd bubble in there but R134a behaves differently - no bubbles. I guess it was just cheaper to use the same cannister than it was to re-tool. It's quite common, lots of early 134a cars (especially those whose systems were originally designed for R12) still have them. My wife's 1999 156 still has one!

06-05-2008	#7 (Post Link)
Avocet AO Member Join Date: Sep 2006 Posts: 324 Member car: 1990 164 Lusso V6	Re: 1996 Alfa 164 Super 24V - A/C Gas Type ?! The sight glass that you refer to on the receiver / dryer unit is a throwback from the days of R12. It was a sign of a healthy system to see the odd bubble in there but R134a behaves differently - no bubbles. I guess it was just cheaper to use the same cannister than it was to re-tool. It's quite common, lots of early 134a cars (especially those whose systems were originally designed for R12) still have them. My wife's 1999 156 still has one!