It’s a 2 row 1” tubes. I’ve narrowed it down to air flow at low low speed. All my components are new. Clutch fans, Hayden 2765 and 2947 are new and neither one is engaging when water temp is 220, so they are bad.
I’ve got Derale dual fan PWM set up, so I’m gonna mess with it to get in there, they pull 3750cfm at full boogie. Hopefully I can get fitting and it should take care of the problem.
