Once I installed my 19.5" 7-blade clutch fan my "hot" issue was compeltely resolved after 7 years of running hot!!! Prior to that I had a 16" 5-blade "fixed" fan and was always running hot. You can find the 19.5" 7-blade clutch fans in the junk yard. My friend Mike and I find one everytime we go. They are on full size GM vehicle from the 60's right through the 90's. We find them often on GM pickup trucks all the time...