PROBLEM: UNIT MAKING RATTLING NOISE DIAGNOSIS: BLOWER WHEEL ON UNIT IS VERY OLD AND RUSTY CAUSING IT TO ROTATE IN AN UNBALANCED MANNER. I CALLED SIGLER WHO IS LOCATING THE PART WHICH IS RARE DUE TO AGE AS UNIT IS FROM 1986. IF NO OEM REPLACEMENT IS FOUND WEATHERMASTERS CAN REMOVE AND ATTEMPT TO FIND A SUITABLE REPLACEMENT WHEEL BUT WILL LEAVE THE IMPACTED AREA WITH NO HEAT OR A/C UNTIL FOUND.