Ninety-Eight FWD V6-181 3.0L (1985)
Thermal Vacuum Valve: Testing and Inspection
EGR Thermal Vacuum Control Valve (EGR-TCV)
This valve is used on some engines in the vacuum line to the EGR valve. The valve is closed below 61° F to block the vacuum to the EGR valve to
permit better cold engine operation. The valve is open above 76° F to provide normal EGR operation.
If vacuum is present at the EGR valve when temperature is below 61° F, or there is no vacuum present when temperature is above 76° F, replace the
valve.
