Inlet Air Temperature Compensator Valve (Spectrum)

Ensure that air will flow from port "A" to port "B". See Fig 1 . Ensure air will not flow through atmospheric port while closing port "B". Heat the ITC valve to about 113°F (45°C). Blow into hose "A" to ensure airflows through the atmospheric port while closing hose "B".

Fig 1: Inlet Air Temperature Compensator Valve (Spectrum)

Courtesy of GENERAL MOTORS CORP.