i thought the stock 8" tube in the lower tank (at 160 degrees) was for heat,and your fluid should be about 180.
i use a 5 x 11 plate style and a Dynamic 91/2 converter.
i don't think it's been above 160,and i don't baby it
It is for both heating and cooling. Your correct that the fluid should not be too cold. I have done some temperature measurements of the lines going in and coming out after running my car hard and there is a cooling effect also.
