8 section 180 1973 7 9 TRUCK SERIES 100 500 YEAR MODEL RESTRICTIONS PART NUMBER DESCRIPTION TY 18C306 REGISTER HEATER AIR DISTRIBUTION 73 F100 350 D3TZ 18C306 A 1 18C312 SEAL HEATER A C BLOWER HOUSING INNER 76 E100 250 Integral A C or D6UZ 18C312 A Main Evaporator I Hi Low vent s stem 18A314 BRACKET AIR CONDITIONER HEATER CONTROL VACUUM MOTOR 75 E100 350 integral A C DSUZ 18A314 A Main evaporator 1 or Hi Low Vent S stem YEAR MODEL RESTRICTIONS CODE PART NUMBER DESCRIPTION QTY 18A318 MOTOR ASSY VACUUM CONTROL Note To identif vacuum motors the function code is also shown on illustrations in Illustration Section 195 73 76 F100 250 integral A C 1 2 D3TZ 18A318 C YH 237 outside air and recirc door I Not re laced 8 82 77 F100 350 integral A C 1822 D7TZ 18A318 A YH 308 outside air and recirc door 1 or Hi Low vent s stem 73 F100 350 integral A C D3TZ 18A318 A YH 219 A C heat d0or red ye ow 1 or Hi Low vent s stem 73 F100 350 integral A C 7 D3TZ 18A318 B YH 218 heat defrost door b ue 1 or Hi Low vent s stem oran e 75 E100 350 integral A C DSDZ 18A318 B YH 256 A C heat d0or main evaporator 1 or Hi Low vent s stem 75 E100 350 integral A C H DSUZ 18A318 B YH 290 located in plenum chamber 1 or Hi Low vent s stem A C heat door 75 8100 250 integral A C and 1 2 D5UZ 18A318 A YH 254 outside air and recirc door 2 aux A C w aux heater or Hi Low vent s stem YEAR MODEL RESTRICTIONS PART NUMBER DESCRIPTION TY 180349 DUCT ASSY AUX AIR CONDITIONER HEATER INLET 78 E100 350 Su er wa rm DBUZ 180349 A 1 180352 DUCT ASSY AUX AIR CONDITIONER HEATER OUTLET 78 EIOO 350 so ar wa rm 08uz 180352 A 1 180356 PLATE ASSY AUX AIR CONDITIONER HEATER REGISTER 78 EIOO 250 su er wa rm D8UZ 18D356 A 1 188358 BRACKET HEATER CONTROL INSTRUMENT PANEL MOUNTING 72 74 E100 200 integral A c with D2uz 188258 A 1 aux heater 72774 8100 200 integral A 0 without 02uz 1882588 1 aux heater 18A361 DOOR ASSY AIR DAMPER 73 74 E1o0 300 C8UZ 18A361 A Not re laced 1 73 F100 350 heater D3TZ 18A361 A Not re laced 1 73 F100 350 integral A C D3TZ 18A361 B 1 or Hi Low vent s stem 75 EIOO 350 Integral A C D5UZ 18A361 B YG 200 use w D7UZ 19805 A Motor 1 main eva orator or Hi Low vent s stem 18A39O SHAFT ASSY HEATER AIR DAMPER DOOR 73 74 E1o0 300 C8UZ 18A390 A Not re laCed 8 82 1 188396 LENS HEATER CONTROL 73 74 EIOO 300 w aux heater D3UZ 188396 A PULL HEAT not re laced 1 A D3UZ 18B396 B FAN AUX not re laced I 18A400 RETAINER TONNEAU COVER 73 noo 220 D10Z 18A400 A AR 188402 TUBE HEATER HOT WATER 76 F100 8 cyl 302 w integral A C C7AZ 18B402 A H type 5 8 hose conn 1 78 E100 350 1 77 E100 350 w aux HTR or A C D7UZ 188402 A Parallel tubes with 2 1 with 138 in W B brazed brackets 73 F100 150 0302 18B402 A T t e 5 8 hose conn x 3 8 en conn 1 73 F100 350 D3OZ 188402 B H t e 5 8 hose conn x 3 8 en conn 1