Thermostat Housing/Coolant Flange (A3 AHU)(B4 1Z)

OEM Number: 037121121A Manufacturer Number: 037121121A

$6.95

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Thermostat housing for A3 Jetta TDI and B4 Passat TDI, AHU and 1Z engine codes. This housing gets brittle with age and often breaks when removing to access the thermostat....

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Available Options
 Thermostat Housing Bolts (2) (+$6.80)
  (+$3.50)
  Name Description Price Select
Thermostat Elbow Seal (AHU 1Z) Thermostat Elbow Seal (AHU 1Z)Seal for the thermostat elbow on AHU and 1Z engines. Seal for the thermostat elbow on AHU and 1Z engines.... $3.86
Thermostat [Mahle] (A4)(A3)(B4)(B5.5) Thermostat [Mahle] (A4)(A3)(B4)(B5.5)Now includes OE-style locking tabs. Thermostat for A4, A3 chassis cars and B4 and B5.5 Passat TDI. Includes the O-ring seal. Now includes OE-style locking tabs. Thermostat for A4, A3 chassis cars and B4 and B5.5 Passat TDI. Includes the O-ring seal.... $24.95
Thermostat [OEM](A4)(A3)(B4) Thermostat [OEM](A4)(A3)(B4)Thermostat for A3, A4 and B4 & B5 chassis cars. Includes the O-ring seal. You may also want to order Thermostat for A3, A4 and B4 & B5 chassis cars. Includes the O-ring seal. You may also want to order... $49.94

Thermostat housing for A3 Jetta TDI and B4 Passat TDI, AHU and 1Z engine codes. This housing gets brittle with age and often breaks when removing to access the thermostat.

Cross References and Supersessions:
037121121A-FE.NLA
V10-0285
Volkswagen
  • Jetta TDI MkIII (A3 chassis) w/ AHU Engine (1997-1999)
  • Passat TDI (B4 chassis) w/ AHU/1Z Engine (1996-1997)

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