Upon arrival performed maintence on older intertherm furnace. Pulled out motor and caging, cleaned and dusted inside of furnace cabinet off, there was extreme amounts of dust, vacuumed and got rid of. Motor is over amping over manufacture specs. Evap coil is really dirty and requires advanced cleaning. Restriction through dirty coil can cause motors to over run. Secondary motor controls have been replaced. Refrigerant levels are good, r22. Amperages are about 60% to max levels . Energy bills in summer are around 150 running full time. Recommmend replacing system due to age and efficiency. Motor leaking oil. Outdated refrigerant. Filter was replaced. 1. Dirty evap coil 2. Dirty blower wheel 3. Indoor motors leaking oil 4. R22 5. Heat exchanger has a lot of heat impingement System was reset tested and functional.