VW T4 Air Conditioning / Heat Units comparison LED change / repair & disassembly

VW T4 Air Conditioning / Heat Units comparison LED change / repair & disassembly
Facelift is on the top

Rear fresh air blower front and rear with additional heat exchanger - Facelift model year 1999

  • type 7D1 819 045 L (7D1819045 L)
  • Frame 7D1 819 075 D (7D1819075D)
  • Upper Heat/AIR Control 7D1 919 383 (7D1919383)

Wiring schema

Wiring schema - E9 / E159 / E179 / E100 - MY 1999

Components

  • E9 – Fresh air blower switch
  • E20 – Switches and instruments - lighting control
  • E159 – Fresh air and air recirculation switch
  • J485 – Auxiliary heater operation relay, control number
    (106)
  • N24 - Fresh Air Blower Series Resistance with Fuse
  • N63 - Fresh Air/Recirculating Flap Two-Way Valve
  • S97 – Fresh air blower fuse 1
  • S98 – Fresh air blower fuse 2
  • Air conditioner relay (140) position 1 (top left)
  • L16 - Fresh Air Control Lever Light
  • V2 - Fresh Air Blower

  • E100 – Warm air blower switch
  • J14 – Warm air blower relay, control number (53), in
    centre behind dash panel
  • J162 – Heater control unit, control number (152), in
    centre behind dash panel
  • N72 – Series resistance for warm air blower
  • N82 – Coolant cut-off valve
  • S51 – Additional heat exchange fuse, under relay plate

Wiring schema


Rear fresh air blower front and rear with additional heat exchanger - Model year 1997

  • type 7D1 819 045 A (7D1819045A)
  • frame 7D1 819 075 C (7D1819075C)

My Disassembly video

Wiring schema

Wiring schema - E9 / E159 / E179 / E100 - MY 1997

Components

Fresh air blower

  • E9 – Fresh air blower switch
  • E20 – Switches and instruments - lighting control
  • N24 – Fresh air blower with overheating fuse series
    resistor
  • V2 – Fresh air blower

Fresh air and air recirculation switch

  • E159 – Fresh air and air recirculation switch
  • J353 – Rear fresh air/air recirculation flap relay, control
    number (94), in centre behind dash panel
  • L91 – Rear fresh air blower switch illumination
  • N45 – Rear fresh air/air recirculation air flap two-way
    valve
  • N63 – Fresh and recirculation air flap two-way valve

Rear warm air blower

  • E100 – Warm air blower switch, in dash panel
  • J14 – Warm air blower relay, control number (53), in
    centre behind dash panel
  • N72 – Series resistance for warm air blower
  • S51 – Rear warm air blower fuse (20A)
  • V47 – Rear warm air blower, rear on passenger
    compartment

Rear fresh air blower

  • E179 – Rear fresh air blower switch
  • J13 – Fresh air blower relay, control number (105)
  • N10 – Series resistor for rear fresh air blower
  • S97 – Fresh air blower fuse 1 (30A)
  • V80 – Rear fresh air blower