I've got a Trane central air unit for my home (dual zone), and the upstairs unit is not putting out cool air. I checked the compressor unit outside, and there is ice on the distribution pipes as they enter the unit. Also, when the fan is running no hot air is being pushed out of the top. The downstairs unit works fine; no ice on the lines and the compressor fan blows hot air to the outside (inside it keeps nice and cool). Both units are original, about
10 years old.Obviously if it is a simple fix I don't want get suckered into buying a whole new compressor. But since I know next to nothing about cooling systems I need to know possible causes for the problem and likely price ranges for what I should expect to pay for repair.
Can anyone help?