B2000 Models
- Drain radiator until coolant level is below intake manifold. Disconnect vacuum hoses from water thermo valve and remove valve from intake manifold. Attach a hose to each port of valve and place valve in container of water with thermometer. Suspend valve in water so it does not touch container.
- Gradually heat water and blow into vacuum hose. Air should pass through valve when temperature is 122°F (50°C). If valve does not respond as outlined, replace water thermo valve.