: High Speed fan switch not working/working well

07-21-04, 08:15 PM
I have a 94 concours with NS. When my radiator fans come on, they do seem to spin as fast as they should be. Is this normal? If not, what can I check out? where is the switch? Any info would be helpful.

07-21-04, 09:13 PM
They should start out on low. Maybe this will better explain it.

Per '97 service manual
Both fans operate together, always at the same speed. The PCM commands LOW SPEED operation under the following conditions:

- Engine coolant temperature exceeds approximately 229*F.
- Transmission fluid temperature exceeds 302*F.
- A/C operation is requested.
- After vehicle is shut off, if the coolant temperature at key-off is more than 304*F, and system voltage is greater than 12 volts, the fans will stay ON for 3 minutes.

The fans will switch to OFF when the coolant drops below 216*F.

HIGH SPEED operation:

- Engine coolant temperature reaches 234*F.
- Transmission temperature is more than 304*F.

The fans will switch from HIGH to LOW when the coolant drops to 229*F.