Wildblue19
I'm Awesome
I've been fighting for a few years with my R134 performance following a conversion from R12 (separate thread here outlining that process). Vehicle is a 5.7L 1993 K1500 Suburban and the A/C sucks.
I wanted to know how GM developed the dual-air (C69) system on these trucks throughout the years, wondering what parts were changed (if any) during the swap from R12 to R134.
Table below is what I found (Part numbers drawn from GM databases online):
To my surprise, there is a ton of variability in the parts. 94-95 trucks saw a lot of short-lived changes, and post 96 things seem to stabilize.
I am posting this for information to help others, since I haven't made my mind up on what parts (if any) I would want to swap to on my truck to try and improve R134's performance, but will update as that changes. My biggest question for now is if changing my rear R12 TXV to a 134 one would help but... that necessitates a total swap of all lines to match the metric threads.
I wanted to know how GM developed the dual-air (C69) system on these trucks throughout the years, wondering what parts were changed (if any) during the swap from R12 to R134.
Table below is what I found (Part numbers drawn from GM databases online):
1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | |
Refrigerant / Fittings | R12, SAE | R12, SAE | R134, Metric (?) | R134, Metric | R134, Metric | R134, Metric | R134, Metric | R134, Metric |
Condenser | 52411109 (88-93), 52486531 (92-93) | 52411109 (88-93), 52486531 (92-93) | 52458719 (94-95) | 52458719 (94-95) | 52480034 (96-00) | 52480034 (96-00) | 52480034 (96-00) | 52480034 (96-00) |
Compressor | 88964864 (84-92) | 88964862 (93-95) | 88964862 (93-95) | 88964862 (93-95) | 89019367 (96-02) | 89019367 (96-02) | 89019367 (96-02) | 89019367 (96-02) |
Evaporator (F) | 52456123 (91-93) | 52456123 (91-93) | 52464036 (94-02) | 52464036 (94-02) | 52464036 (94-02) | 52464036 (94-02) | 52464036 (94-02) | 52464036 (94-02) |
Orifice Tube (96+ non rear A/C got yellow 0.62) | Black (.072) | Black (.072) | Black (.072) | Black (.072) | Black (.072) | Black (.072) | Black (.072) | Black (.072) |
Evaporator (R) | 52457491 (92-93) | 52457491 (92-93) | 52481081 (94-99) | 52481081 (94-99) | 52481081 (94-99) | 52481081 (94-99) | 52481081 (94-99) | 52481081 (94-99) |
TXV (Straight type only) | 52460953 (92), 52460954 (92-93) | 52460954 (92-93) | 52406098(94-99), 52413202(94-95) | 52406098(94-99), 52413202(94-95) | 52406098 (96-99) | 52406098 (96-99) | 52406098 (96-99) | 52406098 (96-99) |
Accumulator (RPO specific, ex. 2724691 is not for C69) | 2724690 (92-93) | 2724690 (92-93) | 1132816 (94-95) | 1132816 (94-95) | 2724962 (95-00) | 2724962 (95-00) | 2724962 (95-00) | 2724962 (95-00) |
To my surprise, there is a ton of variability in the parts. 94-95 trucks saw a lot of short-lived changes, and post 96 things seem to stabilize.
I am posting this for information to help others, since I haven't made my mind up on what parts (if any) I would want to swap to on my truck to try and improve R134's performance, but will update as that changes. My biggest question for now is if changing my rear R12 TXV to a 134 one would help but... that necessitates a total swap of all lines to match the metric threads.
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