I have a Carrier 58PAV Furnace that is starting to make a rattling noise from the blower housing. The unit is approx. 3 years old. I had an AC Service company take a look at it a few weeks ago, within a couple of minutes the repairman told me the Blower Wheel was worn out and needed to be replaced. He didn't even try to realign the blower wheel to the motor or examine the motor. So, I called another company to take a look and they spent an hour examining the blower housing and the motor. He took the motor out of the housing, realigned everything and put the blower housing back together. He informed me the blower wheel is fine and is not worn out ( which he found a little amusing ). He could not find any problems with the housing. So my question is: Do blower wheels or blower housings go bad OR was the first AC repairman trying to sale me something i dont need? How can I tell if the motor is going bad or causing the blower wheel to rattle? After two weeks of the rattling getting worse, I have no clue what to do to get it fixed. I finally decided to pull the blower housing out, took a good look at the blower wheel, spun it with my hand it ran really smooth - appeared to be aligned. The rod connecting the blower wheel to the motor seemed to have a little movement which could cause the rattle. However, I am no expert, I am just trying to isolate the problem. I have noticed that when the motor is running at the lower speed, the system does not rattle. Has anyone heard of "natural frequency" vibration? Could this be causing the problem with the blower motor & wheel? If so, how can this be fixed? Any suggestions or advice is greatly appreciated. Thanks --Patrick

I have a Trane Super efficiency Weathertron Heatpump. If I leave the thermostat at a certain setting say 78 degrees, it will cause the circuit breaker outside to trip. This will happen quite often. Also, the air handler inside will continue to run. If I turn the AC on manually with the temp setting and then off manually, it doesn't trip the breaker. And it seems I can do this indefinitely, but it is annoying. Also, I have had a technician add an extra start capacitor to the compressor for the reason mentioned above. On two separate ocassions, the relays on the unit outside were clogged with ants to the point where it wouldn't turn on. What do you think might be causing this? Thanks Joe