Engine fan control valve for M939A2 series 5 ton truck (6CTA8.3 Cummins).
P/N CA200011, NSN 2930012855027. OEM part.
Valve senses the coolant temperature and applies or releases air pressure to the fan clutch (Applying air pressure engages clutch). Sensing trip point is factory set at 200F and is not adjustable.
Not for use on the M939/A1. For early model trucks see p/n CA200046.