Cutlass Ciera Cruiser V6-231 3.8L (1985)
Fig. 035 - Chart C-12D Two-Speed Coolant Fan Check.
Fig. 036 - WIRING DIAGRAM for Chart C-12D Two-Speed Coolant Fan Check. VIN 3
CHART C-12D
COOLANT FAN CHECK
3.8L "A" SERIES
1.
Grounding the diagnostic test terminal should cause the ECM to ground CKT 532 and the fan should run in low speed.
2.
Grounding the temperature switch harness terminal will check CKT 335 and will also check the high speed fan control relay.
3.
Checks circuit 533 between high speed relay terminal 4 and the motor. If the fan does not operate, CKT 533 is open, or motor is faulty.
4.
When the ignition is turned "OFF" with the temperature switch grounded, the delay relay is activated. This will cause the fan to turn on for up to
10 minutes after engine shutdown.
5.
This step checks to see if the temperature switch is grounding and is grounded when the light comes "ON". The switch should close at 108°C (226
°F).
6.
If the vehicle is equipped with A/C, the following steps will check the head pressure switches related wiring from the switch to the fan control
relay. If poor A/C performance is noted, the A/C pressure switches should be checked by a qualified A/C repair person. The low speed fan should
come on if head pressure exceeds 260 psi and the high speed fan should turn on at 300 psi.
Chart C-12E Fan "On" at All Times - Two-Speed Coolant Fan
