Maybe when he refers to his auxilary fan coming on, he's referring to his low speed fan.

If his car never goes above 90 degrees, the high speed fan is never coming on.

Something seems off to me. 90 degrees is not even close to being hot for this car. It's barely warm. By looking at the cut-in and cut-out temps of the t-stats, viscous fan, low and high speed fans, these cars were made to run between 90 and 100, and even a little higher. It your car is never going over 90, it's not running at the temerature it was designed to run at.


By the way, the high speed and low speed fans are the same fan. There are not two separate fans. There are two separate electrical circuits going to the same fan, and it is simply different resistance that causes the fan to come on at the low speed or high speed.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".