Thermostat Removal and Installation

Thermostat

Removal

 CAUTION: Do not mix Standard (green) Coolant with Extended Life Coolant (orange). If mixing occurs, drain engine cooling system and refill with originally equipped coolant type. If this contamination occurs the service change interval on Extended Life Coolant will be reduced from 6 years/150,000 miles to 3 years/30,000 miles.

1.  WARNING: Never remove the pressure relief cap under any conditions while the engine is operating. Failure to follow these instructions could result in damage to the cooling system or engine and/or personal injury. To avoid having scalding hot coolant or steam blow out of the cooling system or degas bottle, use extreme care when removing the pressure relief cap from a hot cooling system or degas bottle. Wait until the engine has cooled, then wrap a thick cloth around the pressure relief cap and turn it slowly until pressure begins to release. Step back while the pressure is released from the cooling system. When certain all pressure has been released, remove the pressure cap (still with a cloth).

   Drain the engine cooling system so the engine coolant level is below the water thermostat (8575).

2. Remove the hoses from the water inlet connector.
   1. Disconnect the lower radiator hose (8286).
   2. Disconnect the hold-down clamp (12270).

3. Remove the water thermostat.
   1. Remove the bolts.
   2. Remove the water thermostat and O-ring.

4. Inspect the O-ring for damage and replace it if necessary.

Installation

1. Follow the removal procedure in reverse order.

2. Fill the cooling system; refer to Cooling System Draining, Filling and Bleeding in this section.