Code 69, A/C Head Pressure Switch 3.8L

A/C head pressure switch opens ground at 210 psi (14.77 kg/cm² ). When switch is open, fans should run at high speed. If Code 69 is set, engine cooling fans will run at high speed anytime A/C is requested.

Fig 1: Code 69, Schematic, A/C Head Pressure Switch 3.8L

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code 69, Flow Chart, A/C Head Pressure Switch 3.8L

Courtesy of GENERAL MOTORS CORP.