I've been chasing a viscous issue for a while and it dawned on me that I should crowd-source some real info.
When the truck was new I recall the fan clutch engaged on first start and the fan "roaring" for a little while after driving. But that was it for almost the rest of the day. Maybe similar scenario when leaving office etc... but that's about it.
About a year ago, while contemplating cooling system issues I was pointed again to the fan clutch and realized it was no longer making noise on first start-up etc.. OK, so I am losing cooling efficiency there.
I swapped out for aftermarket VFC and now the fan "roars" all-the-time". OK, almost.
First start - yup, runs for a couple minutes max.
Stop for coffee - yup, re-engaged after I get beck in truck
Stop for longer than pick up coffee - Yup, engaged for a couple minutes again
Tahoe in the WINTER? - YUP! Snow on hood, snow on bumper, snow on ground, snow in air... still engaged
Tahoe in SUMMER? - Yup. Cool mountain air down back side of summit on 80, Yup; cool mountain air on 89 returning from white rock? Yup
Altitude? Seems so. Fan stays engaged above about 3,000 feet elevation
I just replaced it again and so far, with the exception of elevation test, this seems to be exhibiting the same behavior.
A) Does any of this sound "normal" to you or your experience?
D1 owners - does your truck behave this way? No, what does your truck do?
Thanks for the help!! I think I see an order for Roverware.US in my future... ;-)