Cooling fan - Diesel Forum

dmausel · 11-06-2009, 09:11 AM

With the hood up, I can see the cooling fan spinning on cold start ups and it spins constantly I think. The heat/ac is off. It's not spinning very fast and roaring like it does on hot days under heavy load or with the AC on. Is this normal? Thanks, Dave

dmausel · 11-12-2009, 07:16 PM

Quote:

Originally Posted by AutoJim

The fan always *turns*, but the fan drive only engages when needed. On warm/hot days with the AC on, it'll engage (at least partially) at stoplights, and when the light changes and you pull away, there's a bit of "flare" that makes some noise until the fan drive can pump out.

Normal stuff. You try to make a 26" fan with a roughly 3" pitch quiet above 1500 rpm or so, without compromising airflow. If you can, let me know and I'll put you in touch with the supplier, who will probably pay you for the patent rights...

sweet