Air Check Valve
- Visually inspect thermactor hoses, tubes, control valve(s) and check valve(s) for leaks that may be due to backflow of exhaust gases. If holes are found and/or traces of exhaust gas products are evident, check valve may be suspect.
- Valve should allow free flow of air in direction of arrow only. See Fig 1
. The valve(s) should check (or block) the free flow of exhaust gas air in the opposite direction.
- If air does not flow as indicated or if exhaust gas backflows opposite of direction of arrow in illustration, replace check valve.
Courtesy of FORD MOTOR CO.