10 slacnoh 180 1973 79 TRUCK SERIES 100 500 YEAR MODEL RESTRICTIONS PART NUMBER DESCRIPTION TY 18478 HEATER AUXILIARY 73 74 E1OO 350 C8UZ 18478 A Core housin not re aced 8 82 1 T 18A478 DOOR DEFROSTER AIR 73 77 r500 01 C5TZ 18A478 A 1 18481 BRACKET HEATER HOSE SUPPORT 73 74 E1OO 300 DOUZ 18481 A Not re laced 1 18A484 HOUSING ASSY HEATER AIs0 refer to rou 18471 73 74 E100 300 CBUZ 18A484 A Hi out ut core not re Iaced 8 82 1 73 74 E100 300 C8UZ 18A484 B Econom core not re aced 8 82 1 75 E100 350 DSUZ 18A484 C Econom core 1 75 E100 350 D5UZ 18A484 D Hi 0ut ut core 1 73 F100 350 D3TZ 18A484 A l li out ut core 1 78 F100 350 D8TZ 18A484 A Deluxe Hi low vent system rep aced by 1 D5TZ 19A559 A 11 80 73 F100 350 D3TZ 18A484 B Econom core 1 73 77 F500 81 C7TZ 18A484 A Remove manual arm and install cable as re uired 1 18A485 PLATE ASSY HEATER HOUSING BLOWER and PLENUM 73 F100 350 D3TZ 18A485 A Not re laced 1 73 77 t500 a1 cm 1aA4s5A 1 18A488 PLATE HEATER HOUSING CORE 73 F100 350 C6OZ 18A488 A Steel 1 78 F100 350 with Deluxe Hi low vent s stem 18490 NOZZLE WINDSHIELD DEFROSTER HOSE Also refer to rou s 18A636 7 75 E100 550 heater 05uz 10490 A 1 75 E100 350 w integral A c D5UZ 18490 8 1 or Hi Low vent s stem 73 74 F100 550 heater D3TZ 18490 c 1 Bef0re Ser T20 0O1 Not re laced 74 F100 350 heater Fr0m Ser T20 0OI D5TZ 18490 B Not re laced 1 73 F100 350 integral A c D5TZ 18490 A 1 0r Hi Low vent s stem Not re laced 18A49O PLATE HEATER BLOWER HOUSING 75 t100 350 heater 05uz 18A490 A 1 73 F100 350 52413 S13 U 316 screw 0val head self tapping 4 N0 8 18 x 1 Z 18495 VALVE ASSY HEATER WATER CONTROL 73 74 E100 300 C3UZ 18495 8 YG 132 1 75 E100 350 D4AZ 18495 A YG 136 10r2 73 74 F100 350 Bef0re Ser U40 001 DODZ 18495 A YG 105 1 Not re laced 74 F100 350 From Ser U40 OO1 D4AZ 18495 A YG 136 1 F Z 184 A YG 13 188498 SWITCH ASSY HEATER OVERHEAT THERMOSTAT 73 74 E1OO 300 w aux heater C4UZ 188498 A Not re aced 8 82 1 18502 VALVE AIR CONDITIONER HEATER TEMPERATURE REGULATOR 75 E100 350 integral A C D3AZ 18502 A YG 113 1 or Hi Low vent 5 stem 73 75 F100 350 w integral A C DZOZ 18502 A YG 46 1 Bef0re Ser V8O OO1 75 77 F150 300 w integral A C D5TZ 18502 A YG 164 1 Fr0m Ser V8O 0O1 78 F100 350 D8TZ 18502 A YG 203 1 18504 FAN ASSY BLOWER MOTOR Als0 refer to rou 19834 73 74 E100 350 main heater C8UZ 18504 A Not re laced 1 73 74 E100 300 w aux heater CSUZ 18504 8 Not re laeettcz 81 1 73 74 E1OO 300 inte ral A C DOUZ 18504 A Not re laced 1 75 E100 350 e main or aux heater Ezuz 12 504 A 1 73 F100 350 heater 00 tz 18504 A 1 73 77 P500 heater D1FZ 18504 A 1