- 1,199
- 454
- 83
- Location
- Spartanburg,SC
I have been doing some research through the TM's and online about how the fan clutch actuator is supposed to work on the 923 but haven't been able to find a satisfactory answer to MY scenario. I have two 923's. On both trucks I can spin the fans without the trucks running and feel the clutches working. Upon starting both trucks, the fans turn. Truck A driving down the Interstate on a hot day, engine temps at 190 degrees, all is well. Truck B driving down the Interstate at 190, I hear the fan kicking in for about 45 seconds, then off for a few minutes. Then on; then off. I can even FEEL the fan kicking in under the load as the engine drops a few RPM's. I never see the temp hand move at all from 190.
Both trucks are good on coolant and all belts are new/tight.
So which truck is working like it is supposed to? Is the fan actuator supposed to engage the fan at full rpm for maximum cooling then " turn off " once the temp drops? One suggestion from a friend is the fan should only kick in " at idle, at high temps " since I should get plenty of cooling air at highway speeds. That makes perfect since and I agree but I honestly don't know. And what is the purpose of the actuator when you have a clutch on the fan to begin with? I'm old school and remember when lots of cars and trucks had clutches on the fan to allow slippage at high speeds yet proper rpm's and cooling at low speeds. Heck I'm old enough to remember " Flex Fans ".
Both trucks are good on coolant and all belts are new/tight.
So which truck is working like it is supposed to? Is the fan actuator supposed to engage the fan at full rpm for maximum cooling then " turn off " once the temp drops? One suggestion from a friend is the fan should only kick in " at idle, at high temps " since I should get plenty of cooling air at highway speeds. That makes perfect since and I agree but I honestly don't know. And what is the purpose of the actuator when you have a clutch on the fan to begin with? I'm old school and remember when lots of cars and trucks had clutches on the fan to allow slippage at high speeds yet proper rpm's and cooling at low speeds. Heck I'm old enough to remember " Flex Fans ".