Thermostat: Service and Repair

Thermostat Replacement (LP1, LY7)

Removal Procedure

1. Partially drain the cooling system. Refer to Draining and Filling Cooling System (GE 47716) Draining and Filling Cooling System (LP1, LY7 Static Fill) Draining and Filling Cooling System (LS2 Static Fill).

Important: Do NOT separate the upper and lower intake manifolds.

2. Remove the upper intake manifold with the lower intake manifold.
3. Disconnect the surge tank hose from the thermostat.




4. Remove the coolant pipe/thermostat housing bolt (2).
5. Remove the coolant pipe upper bolt (7).
6. Remove the coolant inlet pipe (4) from the thermostat.




7. Remove the thermostat bolts.
8. Remove the thermostat and discard the thermostat seal.

Installation Procedure




1. Install the thermostat with a NEW thermostat seal.

Notice: Refer to Fastener Notice.

2. Install the thermostat bolts.

Tighten the thermostat bolts to 10 N.m (89 lb in).




3. Install the coolant pipe (4), NEW seal, and fasteners (2 and 7).
4. Install the surge tank hose to the thermostat.
5. Install the upper intake manifold with the lower intake manifold.
6. Fill the cooling system. Refer to Draining and Filling Cooling System (GE 47716) Draining and Filling Cooling System (LP1, LY7 Static Fill) Draining and Filling Cooling System (LS2 Static Fill).