Volkswagen Workshop Service and Repair Manuals

Thermostat: Service and Repair
Bypass Thermostat

Bypass thermostat

Bypass thermostat, assembly overview

1. Retaining clip

2. Lower part of housing

3. Operating element

4. Spring

5. O-ring

6. Upper part of housing

Checking bypass thermostat:
-

Remove operating element.

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Warm operating element in a coolant bath.

Starts to open: approximately 75°C
Opening end: approximately 85°C
Opens: approximately 5 mm

Bypass thermostat location:

Bypass thermostat for coolant circuit transmission oil:
-

Arrow on bottom part of thermostat points to heater unit heat exchanger.

Bypass thermostat for coolant circuit turbocharger:
-

Arrow on bottom part of housing points to Coolant Pump V50.