Here's a tip that worked for me with the fan on the 5 in 1. Mine was running slowly, and temps were 2 or 3 degrees higher than ambient. I took a small flat head screw driver, removed the fan blades carefully by pushing off the plastic center piece attacked to the motor. Once off, put two or 3 drops of thin lubricant on the motor spindle, and keep it upside down. Move it into the sun so that the motor will run while upside down so the lube can get down into the motor a bit. Put back together. Fan will run like new and thermometer will drop a few degrees from where it was. Mine was less than all neighbors with 5 in 1's and less than my sensor in the rad shield by 1 F. I believe moisture eventually causes fan to start reducing it's power. Saves you some $$ if you were thinking of replacing the whole section.