My central air conditioner was not cooling last year and I had a tech checked, was told that there was a leaking. Spend $ 300 replcaed freon and placed some liquid seal staff and it worked. This year, not cooling again, same tech checked and was told some valve needs to be replced, again spend $ 477 for valve. Now, still not cooling, the tach told me that the cooling coil is rusting and causing ice on the coil and needs to be replced for over $ 800. My central air conditioner is only 4 years old and I really do not trust him anymore. Anybody can help? Advice will be greatly appreciated. Thanks

After the 1st $300. visit I would have quit trusting him
You need to call a different local HVAC company ask for referances before they come out, check them out,
It sounds like you have a unrepaired leak that didn`t get fixed the 1st time,, if it all was replaced 4 years ago, you should not have a rusted coil,
You should call the BBB and report the ones that ripped you off