Should I replace my HVAC system if the evaporator coil leaks?
When an evaporator coil leaks or ices up on a 12-year-old system, cleaning the coils or replacing parts like the capacitor often fails to stop the issue. This leaves homeowners facing the choice of whether to invest in replacing the coils or scrap the entire aging system.
What the numbers show
Counted from the threads quoted below. How we count
- The most recent one is from October 2026.
- This comes up 21.5× more often in r/hvacadvice than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
Should I replace my HVAC system if the evaporator coil leaks?
- 1Setting up a temporary bucket drainage container for the water leakage.Did this help you?
- 2Turning off the AC and switching the fan on to thaw the coils, replacing the filter, and repeatedly calling maintenance.Did this help you?
- 3replacing the whole unitDid this help you?
- 4cutting the whole u-bend and replacing with 2 90s and some tubingDid this help you?
- 5brazing with 15% silver rodDid this help you?
- 6snaking the drain lineDid this help you?
- 7cleaning the return filter and condenser coilDid this help you?
- 8watching YouTube videos for DIY troubleshootingDid this help you?
- 9Checking if the condensate drain line is pluggedDid this help you?
- 10Cleaning gunk out of the drain line and duct connectionDid this help you?
- 11Cleaning dirty patches off the evaporator coilDid this help you?
- 12Opening the duct below the coil to inspect for leaksDid this help you?
- 13Ensuring all air vents are open to reduce back-pressureDid this help you?
- 14Planning to spray the side of the pan with waterproofingDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I’ve got a comfort aire ptac system here and was wondering instead of replacing the whole unit can I just solder this back up and let it keep on keeping on?”source ↗
“I did see ice forming on the bottom and now I'm worried it is outside of my abilities because it might be a refrigerant issue. Should I bend the knee and make the call? or is there anything left that a humble professional YouTube homeowner can do to fix it himself?”source ↗
“Outside unit capacitor blew. Replaced it and now the inside coils are icing up. Cleaned the coils and the problem persists.”source ↗
“I noticed the master bedroom is a little warmer than the other areas of the apartment”source ↗
“I noticed the airflow is very minimal compared to the other supply vents around the apartment”source ↗
“the fins on the Evap Coils are in terrible condition”source ↗
“Suddenly, I had a fairly significant water leak coming out the side of the duct and running down the side of the furnace.”source ↗
“With the drain line flowing perfectly, the water must be bypassing the pan somehow or the pan must be leaking, but I couldn't see any obvious leaks, from below.”source ↗
Where this came up
People with this problem also raised
- 4Can you service an HVAC system with leak seal in it?
- 6Can I use K-Seal for a leaking heater core or should I bypass it?
- 2How to reach a frozen evaporator coil blocked by refrigerant lines
- 13Refrigerator water line leaking and flooring damage
- 3Why is my fridge fan making a dull noise and rattling?
- 9How to temporarily fix a leaking car radiator