My 5 year old 4-ton Carrier A/C unit (Air handler CNPVP4821 with TXV, Outdoor unit CA16NA048 has stopped cooling. If I turn off the system for 3 hours, it would cool for the next hour than ice up. Two Techs have seen it. The first one said that – a) system is low on Puron and b) the TXV needs to be replaced. He did not use a leak tester and all his testing was with the coils still iced up. When he tested the outdoor unit, he had to call his back office to report an error code “OL” on his tester. He quoted $2200 for TXV replacement, but said that there is no guarantee it will fix the problem. He said that I may have to replace the coil as well for an additional $3500. The second one came to the same conclusion – system low on Puron and TXV needed replacement. He waited for the ice to melt and used a leak tester on the coils, the TXV, and also the outdoor unit, but it did not detect any leaks. He thinks the TXV is clogged up, but had no explanation for the low level of Puron. He will quote a price for TXV replacement tomorrow after he gets the part cost from Carrier. What should I do - get the TXV replaced, or the whole cased coil unit replaced or the whole AC system replaced?

Evening guys, wonder if I might get a hand with a fan replacement problem I'm having on a portable a/c unit. Background....I have a edgestar ap14000hs portable a/c unit that recently tried to fire up after 7 years of no use. Initially it fired up and would cool room off 1-2 degrees and then kick off, after 10 minutes wash/rinse/repeat. After a couple cycles of this I investigated a little further and noticed the exhaust fan, was not turning, so I tried to manually spin it, thinking the capacitor was shot or fan seized, but the motor would freely turn but still not kick on. I took the unit apart, there is no wire diagram in the unit anywhere. It has a couple capacitors in it for exhaust and fan out, and according to their specs, looked like they were good on my meter. I put my ohmeter on the fan, which has 5 wires coming out of it. Two go to the capacitor, two go to circuit board and one went to a terminal on side of fan housing. I didn't really see an open in any of the windings so I figured fan probably good. I ordered the circuit board since it has a number of small capacitors and small relays, figuring it might be bad. Replaced it, still same problem. I went ahead and ordered the exhaust fan, but the problem I'm having now is, the original fan had 5 wires, the new fan has 4 wires. I called edgestar and after a couple phone calls they pretty much told me I'd have to take it to a repair center if I couldn't figure out how to wire it. GRRRRRRRRR!!!!! If it was plug and play, matched the old fan wire colors and number of wires, it would be no sweat but it doesn't. They said that I got the direct replacement for my unit and that the wire omitted was probably a low/hi speed wire, where as the new fan is one speed only. I can buy that, but I don't know for sure which wires to put to capacitor and which wires to circuit board. Anybody have any advice what to look for? The old motor was on the left with 5 wires, and the new one is on the right with 4 wires, plus colors don't match. Thanks much for any help. Russ[ATTACH]82390[/ATTACH][ATTACH]82391[/ATTACH][ATTACH]82393[/ATTACH]