Thanks again to all that replied.The problem was the thermal fan switch on the back of the cylinder. The switch was $9.00 from the dealer but what a time consuming job to replace it where the engineers mounted it!! I pulled 1 wire off and the fan went off. I started to take the 2nd wire off and the part they were attached to fell off.In the future if I have this problem, It not turning off, I will put it on a toggle switch, turn on and off at will. Thanks again.