350SDL (126.135) L6-3.5L DSL Turbo (603.970) (1990)
Fresh/Recirculated Air Switch Testing
7.
Connect the ohmmeter to terminals 2 and 4.
8.
Depress the non-symbol side of the switch ("OFF"). The resistance should be:
Infinite resistance
9.
Release switch. The resistance should be:
0 - 1 ohm
If the correct resistance is not obtained, replace the switch.