Technical specifications (Opel Vectra B)

System type	Sealed, with a separate expansion tank
Thermostat:
Petrol engines:
– opening start temperature	92°C
– full opening temperature	107°C
Diesel engine 1.7 liter:
– opening start:
• main valve	86 – 90°C
• auxiliary valve	83 – 87°C
- full opening:
• main valve	103°C
• auxiliary valve	100°C
2.0 liter diesel engine:
– opening start temperature	92°C
– full opening temperature	107°C
Oil radiator thermostat (diesel engine X17DT):
– opening start temperature	107°C
– full opening temperature	120°C
Electric radiator fan:
Switch-on temperature	100°C
Shutdown temperature	95°C
Expansion tank cap:
Opening pressure of the relief valve:
- petrol engines	1.2 – 1.5 bar
- diesel engines	1.4 – 1.5 bar
System pressure:
Pressure when checking the cooling system	1.2 bar for 10 seconds

Tightening torques (Nm)

Air Conditioning Compressor Mounting Bolt:
– except for the X20DTL diesel engine	35
– diesel engine X20DTL	20 – 24
Coolant Temperature Sensor:
– 1.6 liter petrol engines	14
– DOHC petrol engines 1.8 and 2.0 liters	10
- 1.7 liter diesel engine	8
– 2.0 liter diesel engine:
• to the thermostat housing	10
• to the cylinder head	18
Water pump mounting bolts:
– 1.6 liter petrol engines	8
– 1.8 and 2.0 liter petrol engines	25
- 1.7 liter diesel engine	20
- 2.0 liter diesel engine	20
Water Pump Pulley Mounts:
– diesel engine 1.7	10
– diesel engine 2.0	20
Thermostat cover:
– 1.6 liter SOHC petrol engine	10
– 1.6 liter DOHC petrol engine	8
– DOHC petrol engines 1.8 and 2.0 liters	15
– diesel engine 1.7	24
– diesel engine 2.0:
• standard thermostat	8
• oil radiator thermostat	20
Thermostat housing:
– 1.6 liter DOHC petrol engine	20
– DOHC petrol engines 1.8 and 2.0 liters	15
- 1.7 liter diesel engine	24
– 2.0 liter diesel engine:
• thermostat to cylinder block	20
• thermostat to cylinder head cylinders	8
Right engine mount mounting nut	45