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G3 Thermostat Housing Top - 1.6, 1.8, 2.0, 1.9 Diesel

This thermostat flange cover seals the thermostat housing and helps retain coolant within the engine cooling system. It mounts over the thermostat and works with the O-ring seal to keep the housing watertight while allowing the thermostat to control coolant flow between the engine and radiator. When the engine is cold, the thermostat stays closed to help the engine warm up quickly. As temperature rises, it opens to allow coolant to circulate through the radiator and maintain the correct operating temperature.

These flange covers are a common failure point on many VW watercooled models because the plastic becomes brittle with age and repeated heat cycles. Cracks, warping or damaged sealing faces can cause coolant leaks, overheating, poor heater performance, or repeated loss of coolant. Replacing the cover is good practice when renewing the thermostat, coolant flange, or carrying out cooling system repairs.

O-ring seal is not included and must be ordered separately: 038121119B. It is also worth checking the thermostat itself, retaining clips/bolts, adjoining hoses, and the rest of the housing for wear or distortion.

Fits

  • Golf Mk3 Hatchback, Estate & Cabriolet: 1.6 petrol 101bhp, 1.8 petrol 75/90bhp, 2.0 petrol 107/115/150bhp, 1.9 diesel/TD/TDI/SDI 64/75/90/110bhp (1991-1999, Cabrio to 2002 depending on model)
  • Vento: 1.6 petrol 101bhp, 1.8 petrol 75/90bhp, 2.0 petrol 115bhp, 1.9 diesel/TDI 64/65/75/90/110bhp (1991-1998)
  • Passat B3/B4 Saloon & Estate: 1.6 petrol 101bhp, 1.8 petrol 75/90bhp, 2.0 petrol 107/115bhp, 1.9 diesel/TD/TDI 68/75/110bhp (1988-1997)
  • Polo Mk3 6N / Polo Classic / Estate: 1.6 petrol 75/100/101bhp, 1.8 petrol 90bhp, 1.7 diesel 57bhp, 1.9 diesel/TDI 64/90bhp, 1.4 diesel 75bhp (1995-2002)
  • Corrado: 2.0 petrol (1989-1995)
  • Caddy Mk2: 1.6 petrol 75bhp, 1.7 diesel 57bhp, 1.9 diesel/TDI 64/90bhp (1995-2004)
  • New Beetle, Bora, Golf Mk4, Lupo, Sharan: selected 1.9 diesel and 2.0 petrol applications as listed
  • Engine codes include: 1Y, 1Z, 2E, AAM, AAZ, ABS, ACC, ADY, ADZ, AEK, AEY, AFN, AFT, AGG, AHU, AKR, ABF, AKS, ALE, AEP

This Part Fits: Mk3 Golf, Corrado, Mk4 Golf,

Availability: Special Order Item

Item Name: Coolant Flange

Description: Coolant Flange

Product Group: Cooling

Group: Cooling System

Unit of Measure: Each

Manufacturer: JP

Dimensions:

Width: 65mm

Height: 50mm

Depth: 100mm

Volume: 325000mm3

Weight: 0.07kg

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