See Figure 1
The air check valve is a 1-way valve that allows thermactor air to pass into the exhaust system while preventing exhaust gases from passing in the opposite direction.
- Turn the ignition key OFF .
- Visually inspect the thermactor system hoses, tubes, control valve(s) and check valve(s) for leaks or external signs of damage, from the back flow of hot exhaust gases.
- If the hoses and valves are okay, proceed to Step 4. If they are not, service or replace the damaged parts, including the check valve.
- Remove the hose from the check valve inlet and visually check the inside of the hose for damage from hot exhaust gas.
- If the hose is clean and undamaged, proceed to Step 6. If not, replace the hose and check valve.
- Start the engine and listen for escaping exhaust gas from the check valve. Feel for the gas only if the engine temperature is at an acceptable level.
- If any exhaust gas is escaping, replace the check valve.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Disconnect the input hose from the check valve.
- Remove the check valve from the connecting tube.
- Installation is the reverse of the removal procedure.