67 68 Ser 10 thru 30 exc D D FFC C A C 3934832 1 8 25 69 70 Ser 10 thru 30 exc D D FFC C A C 3952204 1 8 50 69 70 All Blazer Cab w C A C 1222890 1 16 15 heater 8 850 VALVE ASSY Heater Vacuum Actuating 68 70 All Blazer w C A C 3010369 1 3 65 w seal A C evap temp 67 68 Ser 10 thru 30 w Air Cond 1st design 1222690 1 3 25 heater and A C sensor assy vacuum control Note 1 NOTE 1 Not used w water shut off valve 68 Ser 10 thru 30 w Air Cond 2nd design 69 Cab w Acc Air Cond 7308785 1 3 45 heater and A C sensor assy vacuum control Note 2 NOTE 2 Used w water shut off valve 8 852 SWITCH WIRE ASSY KNOB PLATE BRACKET BEZEL LENS LEVER RETA NER SPRING NUT CL P PIN SHAFT POST ASSY ESCUTCHEON STOP BUSHING GROMMET Heater NOTE See group 9 786 for vacuum valve details and part numbers 47 55 Comm Utility w Air Flow lst Ser 3128267 1 2 55 high and low 38 55 Comm Utility w Dash Htr 1st Ser 3126693 1 3 20 high medium and low 55 59 Ser 3 w Air Flow 2nd Ser 3144263 1 2 60 heater 69 70 G 10 20 3928407 1 2 90 heater control 55 59 Ser 3 w Recirc 2nd Ser 3757698 1 1 60 SWITCH ASSY heater 59 67 Van exc 102 W B 5720494 1 5 10 SWITCH ASSY heater 60 63 Ser 10 thru 30 3829366 1 1 60 SWITCH ASSY heater control 63 67 Ser 10 20 Van 68 70 Ser 10 Van w Steel body 5724112 1 2 90 SWITCH ASSY heater 65 66 Ser 10 thru 30 3849991 1 2 85 SWITCH ASSY blower and air control cable economy 64 66 G 10 3843526 1 1 85 SWITCH ASSY heater control 64 70 Ser 10 thru 30 exc C A C 3840039 1 1 30 SWITCH ASSY heater control deluxe 65 70 Ser 10 20 Sub G 10 20 2415065 1 2 70 SWITCH ASSY auxiliary heater 67 70 Ser 10 thru 30 w C A C 3857992 1 1 20 SWITCH ASSY heater control and A C 67 70 G 10 20 3928407 1 2 90 SWITCH ASSY heater control 68 70 Ser 20 30 Van 725750 1 5 85 SWITCH ASSY heater 60 63 Ser 10 thru 30 2981982 1 3 10 WIRE ASSY heater control 64 65 Ser 10 thru 30 2986055 1 2 85 WIRE ASSY heater control 55 58 Ser 3 w Air Flow 2nd Ser 3817511 1 15 KNOB motor switch control 55 59 Ser 3 w Recirc 2nd Ser 3134736 1 65 KNOB switch control 64 66 Ser 10 thru 30 w Air Flow 384361 1 3 45 KNOB control 67 70 Ser 10 thru 30 7295955 3 42 KNOB control 68 70 Ser 20 30 Van 725751 1 65 KNOB heater switch 64 66 Ser 10 thru 30 w Air Cond 3831678 1 75 KNOB ASSY blower and temp control 64 66 Ser 10 thru 30 exc Deluxe 1991041 1 45 KNOB ASSY blower air control 64 66 G 10 3792753 1 45 KNOB ASSY control switch 65 67 Ser 10 20 Sub G 10 20 2464965 1 65 KNOB ASSY auxiliary heater switch 67 Ser 10 thru 30 67 68 G 10 20 1991052 A R 65 KNOB ASSY heater blower and air control 67 68 G 10 20 exc Deluxe 1991059 A R 45 KNOB ASSY heater cont switch 68 G 10 20 67 68 Ser 10 20 Sgl Unit 1991077 1 55 KNOB ASSY aux heater switch defroster Ivr 68 G 10 20 Deluxe 1991067 3 65 KNOB ASSY control and control switch 68 70 G 10 20 exc Deluxe 1991072 3 55 KNOB ASSY control 68 70 G 10 20 Deluxe 1991081 3 70 KNOB ASSY heater control switch 68 70 G 10 20 exc Deluxe 1991082 A R 45 KNOB ASSY heater cont switch 55 59 Ser 3 w Air Flow 2nd Ser 3816612A R 45 KNOB UNIT temp def control 60 64 Ser 10 thru 30 3833127 A R 65 KNOB UNIT heater temp defrost air 60 63 Ser 10 thru 30 w Air Flow 31571 18 1 6 95 PLATE control face 64 66 G 10 3844289 1 30 PLATE heater control switch trim 64 66 Ser 10 thru 30 w Deluxe 3885188 1 1 70 PLATE heater control face 67 70 G 10 20 3899770 1 55 PLATE heater control switch trim j 1971 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION P A 31 8 849 8 852 8 8 REV 6 71