Only System- 15 yr old Rheem Furnace/5 yr old ac Homeowner informed me the system was making a whistle noise and had been struggling to heat the home. I observed that the heat exchanger is compromised in several areas. The blower motor is leaking oil and not reaching full rpm, the bearings are worn, and the motor is over amping. The blower wheel is completely impacted with debris which is restricting air flow across the heat exchanger and evaporator coil. The system cut off once on high limit switch due to the system over heating. When this happens the flames go out and the system will run the fan only to cool the system back down to safe operating temperature. The igniter is weak and outdated, the flame rectifier is weak and chalky. The inducer motor is loud from worn bearings and causing the motor to over amp due to higher resistance/friction rate. The furnace cabinet is rusted very thin in some areas. The return plenum has no insulation on it and this is a vented crawl space. The