Vauxhall Workshop Service and Repair Manuals

Seal Ring, Cylinder Head Thermostat Housing, Replace (16 LZ2 and 20 NEJ)  

  Remove, Disconnect   

Remove lower coolant hose from radiator - collect escaping coolant. Remove upper coolant hose (3) from coolant outlet flange. Remove coolant hose (2) from thermostat housing.   Disconnect wiring harness plug (1) from coolant temperature sender.   Remove rear toothed belt cover - see operation "Rear Toothed Belt Cover, Remove and Install (16 LZ2 and 20 NEJ)".   Remove support and shackle with cable bundle bracket (6) from alternator - for this, release fastening bolts (4) and (5).   Remove fastening bolts (7) and (8) from alternator. Release lower alternator fastening bolt and tilt alternator backwards.

  Remove, Disconnect   

Remove coolant hoses (1) and (2) from thermostat housing. Disconnect wiring harness plug from coolant temperature sensor. Remove thermostat housing (3) with seal ring from cylinder head.     Clean    Remove gasket remnants and clean sealing surfaces.     Install, Connect    When replacing the thermostat housing - re-install attaching parts.   Attach coolant temperature sender to thermostat housing - tightening torque 8 Nm / 6 lbf. ft. Attach coolant temperature sensor to thermostat housing - tightening torque 11 Nm / 8 lbf. ft. Attach coolant outlet flange with new seal ring to thermostat housing - tightening torque 8 Nm / 6 lbf. ft.   Insert new seal ring (4) into cylinder head. Attach thermostat housing (3) to cylinder head - tightening torque 15 Nm / 11 lbf. ft.   Attach coolant hoses (1) and (2) to thermostat housing. Connect wiring harness plug to coolant temperature sensor.

  Install, Connect   

Attach support (1) and shackle (2) with wiring harness bracket (3) to intake manifold and to alternator - tightening torque 20 Nm / 15 lbf. ft.   Tighten lower alternator fastening bolt - tightening torque 35 Nm / 26 lbf. ft.   Connect wiring harness plug to coolant temperature sender.   Attach coolant hose to thermostat housing and to coolant outlet flange.   Install lower coolant hose on radiator.   Install rear toothed belt cover - see operation "Rear Toothed Belt Cover, Remove and Install (16 LZ2 and 20 NEJ)".     Inspect    Top up cooling system - see operations "Cooling System, Top up and Bleed" and "Cooling System, Check for Leaks".