I have two systems in our home, one for upstairs and one for down. Both are identical, but we only upgraded the downstairs when we bought the home 5 years ago because we rarely use the upstairs.
It's a Trane system approx 20 years old. XL1200 outside....been reliable except for the Cap needing replacement.
Downstairs runs amazing since we replaced the inside coil with a TXH033A4HPA2 high efficiency coil and a new trane furnace with variable speed fan, and never having replaced the XL1200's outside (3 ton downstairs and 2 ton upstairs)
Upstairs is still all the original system.
Now I am using the upstairs more often and when we turn it on, we get a "musty acrid" odor. The unit leaks a lot of water from the unit into the drip pan and then outside. It is rusty in color, so I am sure hte odor is from the rusting. THe drain to the outside has a constent drip drip when the unit is running. It cools....probably not at its peak and certainly not as good as the downstairs, but it works.
My AC people tell me that the "coil is rotten" and needs replacement.
I'm a little perplexed at exactly what "rotted out" means?
1) I am sure the coil is constructed with copper/aluminus so what would be "rotted"
2) Where is the rust coming from, and the rusty odor?
3) Why is so much water being produced?
I was given a price of over $ to replace the coils. I REALLY cant afford that sort of repair right now, so I am trying to figure out, if there is anything that can be done, such as opening up the unit and cleaning the coils or something to stop the water dripping. I am assuming that the rust smell might be comming from the inside of the airbox from all the water being pooled inside and slowly over many years rusting the metal.
The unit runs well otherwise, so I dont want to have to spend $ bucks right now unless absolutely necessary.