Express 1/2 Ton Van V6-4.3L VIN W (1999)
1. Install the bypass valve (3) into the vehicle.
2. Connect the heater inlet pipe and the outlet pipe to the bypass valve(s).
3. Install the hose clamps using the J 39529.
4. Fill the engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
5. Verify that the system has no leaks.