BODY MOUNTING AIR COND INSTRUMENTS GMC GROUP 9 275 Con t 73 78 CK 1 2 Sub w roof mounted A C C69 74 78 G 1 2 3 w roof mounted A C C69 328239 1 12 55 SWITCH ASM evap and blower 26 1014 74 77 G 1 2 3 w A C 9343126 1 8 55 SWITCH ASM board car heater and a c 26 1890 74 77 CK 1 2 3 Blazer Jimmy w A C 340428 1 15 75 SWITCH ASM a c vac 26 1014 74 78 CKG 1 2 3 Blazer Jimmy w A C 339848 1 13 35 SWITCH ASM a c comp cut off pressure 26 1890 74 78 G 1 2 3 w roof mounted A C 370809 1 7 35 SWITCH ASM a c blower motor 26 1890 i 78 G1 2 3 w aux heater 370809 1 7 35 SWITCH ASM aux heater cont 26 1890 76 77 CK 1 2 3 Blazer Jimmy w A C 470333 1 15 45 SWITCH ASM vacuum 26 1890 76 78 CK 1 2 3 Blazer Jimmy w A C 3039429 1 27 55 SWITCH ASM thermostatic electric capillary 26 1257 78 G1 2 3 16015256 1 5 90 SWITCH ASM blower 26 1257 78 CK 1 2 3 w A C C60 470333 1 15 45 SWITCH ASM car htr and A C vac 26 1890 I 76 77 G 1 2 3 w A C 1223590 1 N L SWITCH ASM blower 26 1257 78 G1 2 3 w A C C60 16001570 1 3 39 SWITCH ASM select rotary 4 terminal selector sw 26 1890 78 CK1 2 3 w A C C60 A 1st Des 3039429 1 27 55 SWITCH w therm elec type cycling 26 1890 78 CK1 2 06 w A C C69 78 G1 2 3 w A C C69 328239 1 12 55 SWITCH a c blo mtr 26 1890 78 CK1 2 3 w A C C60 469368 1 4 60 SWITCH car htr a c cont fan Note 1 4 terminal 78 CK1 2 3 w A C C60 3041336 1 N L SWITCH w O ring pkg press 26 185 7 78 G1 2 3 w A C C60 3034513 1 22 65 SWITCH ASM therm elec 26 1257 9 276 BRACKET CONNECTOR IHARNESS ASM WIRE Air Conditioning A Electrical NOTE 1 It may be necessary to remove 14 gauge brown wire from heater switch conn body and install conn body from old harness for heater switch conn Tape back remaining unused wires NOTE 2 1st des 1977 has two connecting bodies that plug onto high blower relay 2nd design 1977 V has one NOTE 3 For 1st design 1978 identified by A C system temp control switch mounted on evaporator inlet pipe support bracket for 2nd design 1978 it is mounted near top of accum bottle 73 78 M H C 3031971 1 110 00 HARNESS ASM A C evap wiring 7 8205H 73 74 CK 1 2 3 Blazer Jimmy J w A C 8906014 1 60 75 HARNESS ASM A C wiring 7 8205H i 74 77 G 1 2 3 w A C 8913153 1 213 00 HARNESS ASM a c wiring 7 8205H 75 76 CK 1 2 3 Blazer Jimmy w A C 1 2001043 1 1 10 00 HARNESS ASM a c wiring 7 8205H 76 77 G1 2 3 w roof mounted A C 12001107 1 222 00 HARNESS ASM A C wiring 77 CK 1 2 3 Blazer Jimmy I w A C 1st des 12001099 1 104 00 HARNESS ASM a c wiring Note 2 7 8205H 77 CK1 2 3 w A C C60 2nd des 78 CK1 2 3 w A C C60 1st des 12001165 1 104 00 HARNESS a c wrg Note 2 3 7 8205H 78 G1 2 3 w A C C69 12001176 1 38 50 HARNESS a c ext wrg 7 8205H 78 CK1 2 3 2nd Des 12012515 1 59 50 HARNESS A C wrg Note 3 7 820510 73 76 CK 1 2 3 Blazer Jimmy 6258028 1 2 80 BRACKET w cam A C recirculating valve actu 26 1640 74 78 CK1 2 06 w A C C69 2984528 1 44 CONlNECTOR a c blo mtr ext wire 2 530 7 8194A 75 78 M H C 3013674 1 3 80 WIRE ranco valve to blower switch 7 8194 78 G1 2 3 w A C C60 12001235 1 l8 90 WIRE a c cmpr ext 7 8194 78 G1 2 3 w A C C60 12001235 1 l8 90 WIRE A C cmpr ext 7 8194 78 G1 2 3 w A C C60 C69 12001298 1 l 8 90 WIRIE A C harness 7 8194 9 277 BREAKER ASM RELAY A SM Air Conditioning Electrical 73 75 cl c 1 2 s Blazer I Jimmy 76 77 CK 1 2 3 Blazer Jimmy 1115858 1 19 50 RELAY ASM A C wiring A C and heater blower motor cut out 7 7340 WAREHOUSING AND DISTRIBUTIONDIVISION OF GENERAL MOTORS CORPORATl0N LT TRUCK 51 REV 2 83 9 23 9 275 9 277