We have the 2008 model 140m and I must say the fan is about the only thing on the machine that never flew to pieces, and there is no whining noise you speak of on our 140m sense new, but the highest temperature average here in summer is around 80-85 F, so the demand on the fan would not be as high I would think as in the heart of the summer in Texas would be, so the demand on the fan in your machine would be a lot more then ours, I would have to side with Nige on the oil viscosity and brand type plus software upgrade also always make sure your Rad's are kept clean, run nothing but Cat hydraulic oil, it is specifically designed for the M series hydraulic system, I believe there is a summer and a winter hydraulic oil for big temp swing like here between the seasons, you may have to get the proper viscosity hydraulic oil for the temps you are running your machine in, the newer m series are different with the regen systems and DEF systems and reversing fans they run now.