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HVAC evaporator coil replacement.

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  • 1 Post By 99yam40
  • 1 Post By baypro21

HVAC evaporator coil replacement.

Old 05-27-2019, 04:21 PM
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Default HVAC evaporator coil replacement.

How difficult is is to replace one? Mom had hers diagnosed and she needs a new one. Funds are tight and I'm wondering if this is something I could do. Any help would be appreciated.
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Old 05-27-2019, 04:27 PM
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Pretty tough. What kind of refrigerant?
how fast is leak?
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Old 05-27-2019, 04:29 PM
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Originally Posted by Shipwreck1 View Post
Pretty tough. What kind of refrigerant?
how fast is leak?
Freeon (sp?) And fast
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Old 05-27-2019, 04:30 PM
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There is no AC stopleak,,,,
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Old 05-27-2019, 04:31 PM
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I have good mechanical skills just not in this area.
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Old 05-27-2019, 04:32 PM
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Originally Posted by billinstuart View Post
There is no AC stopleak,,,,
Soooo...?
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Old 05-27-2019, 04:51 PM
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Originally Posted by Godspeed View Post
Soooo...?
There actually is. It just doesn't work very well.
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Old 05-27-2019, 05:00 PM
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you really need to have a vacuum pump to suck all of the old leftover refrigerant out and then put a Nitrogen pad on the system to keep O2 out while you cut the old one loose and use a torch to soder in a new one, then vac it back down before adding the exact correct amount of refrigerant back in.
not to mention the proper orifice or piston, or depending on you system the correct expansion valve.

these units now a days are not like the old 22 units where you just go by pressures
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Old 05-27-2019, 05:10 PM
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Thanks guys. It's a miller 3 ton. It came with her manufactured home in late 2014. I guess there's no warranty
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Old 05-27-2019, 05:16 PM
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need to find the paper work she got with the home or who installed the A/C to see what the warranty says

Last edited by 99yam40; 05-27-2019 at 05:22 PM.
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Old 05-27-2019, 05:39 PM
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You need a recovery machine, storage tank, acetylene torch, nitrogen, vacuum pump, service gauges, refrigerant, mastic or mastic tape, and the know how to use all that stuff. I'm afraid it's a not a diy job.

Where in NC is mom?
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Old 05-27-2019, 05:42 PM
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Originally Posted by 99yam40 View Post
need to find the paper work she got with the home or who installed the A/C to see what the warranty says
Apparently she didn't file the paperwork at the time of purchase so she has no warranty. The manufacture is closed today so I can't contact them.
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Old 05-27-2019, 05:43 PM
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Originally Posted by baypro21 View Post
You need a recovery machine, storage tank, acetylene torch, nitrogen, vacuum pump, service gauges, refrigerant, mastic or mastic tape, and the know how to use all that stuff. I'm afraid it's a not a diy job.

Where in NC is mom?
Hampstead. I figured it wasn't, but she lost all her money in a scam from a fake military member. Sucks.
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Old 05-27-2019, 05:46 PM
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Is this a package unit? Is it a heat pump?
if it is a non heat pump package unit, they are pretty reasonable and you could probably swap it (buy entire new unit) out yourself with no special tools. They sale them at mobile home parts stores.
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Old 05-27-2019, 05:48 PM
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Originally Posted by Godspeed View Post
Apparently she didn't file the paperwork at the time of purchase so she has no warranty. The manufacture is closed today so I can't contact them.
only choice I can see is finding the best local A/C tech or company, and then asking if they could help with the warranty some how
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Old 05-27-2019, 05:48 PM
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This is becoming a more frequent problem with seer ratings trying to constantly outdo the latest. The aluminum has become paper thin to make them more efficient, but also more prone to leaks. When an evaporator goes, it’s generally time for a replacement, at least on that side of the system. Remember when AC units lasted 20 years with no problems? Yeah, those days are over. Makes me want to start an HVAC business just typing about it!
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Old 05-27-2019, 05:49 PM
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Originally Posted by Godspeed View Post
Hampstead
is he positive it’s an evap I would wanna pt that myself, might b fixable as long as it’s not in the tube sheet .
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Old 05-27-2019, 07:16 PM
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I moved into this house in 1979, that A/C ran without leaks for 30 years.
fins fell off , fan motors failed, drain pans rusted thru, but no leaks
new one leaked in 11 years
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