Radiator Coolant Flow

Use the following procedure to determine if coolant is flowing through the cooling system.

1. Idle engine until operating temperature is reached. If the upper radiator hose is warm to the touch, the thermostat is opening and coolant is flowing to the radiator.
   WARNING:

   Hot, pressurized coolant can cause injury by scalding. Using a rag to cover the radiator pressure cap, open radiator cap slowly to the first stop. This will allow any built-up pressure to vent to the reserve/overflow tank. After pressure build-up has been released, remove cap from filler neck.

2. Drain a small amount of coolant from the radiator until the ends of the radiator tubes are visible through the filler neck. Idle the engine at normal operating temperature. If coolant is flowing past the exposed tubes, the coolant is circulating.