whining noise on 2007 GMC Sierra 2500HD
I always enjoy coming on here and getting advice on minor bumps I come across along the way.. My current issue is on cold days only, I have a "whine" when first driving my truck until it warms up aft...
Forum Discussion
mtofell1 wrote:
Same truck/tranny and I once posted this exact question on a board (not sure if it was this one). I seem to remember being told it was a fan of some type.... although as I'm typing this I can't imagine why a fan would come on in the cold.
Anyway, my noise isn't so much a "whine" as it is a very fast movement of air that almost sounds like a whine. And it definitely follows the transmission and engine speed - louder at high rpm, slightly quieter after a shift since lower rpm.
It generally happens during colder weather and is quite loud. What you describe sounds a lot like what I was worried about.... it's pretty loud.
What you are describing is the fan clutch. On gm trucks they use a viscous fluid clutch that, when cold, will cause the fan to roar with engine rpm for the first mile or 2 untill the fluid warms and releases the fan. Every gm truck does this.
