Poor AC performance after blower motor capacitor replced

Old 07-15-16, 11:32 AM
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Poor AC performance after blower motor capacitor replced

Hi All,

New to the forum, searched around but couldn't quite find an answer.

I have a 10ish year old Nordyne gas pack unit, model # GR4GC-024K072X. Came with the house that we bought in April, which was built in the 50's. About 1300 sq ft, new windows, ducts are in the crawlspace and are well insulated.

So here is my issue: I had the start-run capacitor on the blower motor replaced 2 days ago (by a pro), and since then the AC has not been able to cool the house as well as it did before. We kept it set at 75, down to 72 at night, AC cycled on and off as expected, never seemed to be working too hard. Now, the past 2 days it hasn't gone below 76 during the day while running constantly, only gets down to 72 at night, and takes much longer than before.

Had the same guy come back and check refrigerant levels, etc., he said everything was good, it's just hot outside (90's) and the unit is old. 58F coming out of the registers. Fair enough, but it isn't any hotter than it was last week, and was working fine then.

Anyone have any ideas? The only thing I can think of is; he removed most of the insulation on the top panels of the unit because it was falling apart. Is there any chance that insulation could have such a dramatic effect on performance? What should I replace it with? Pretty sure it's foil lined fiberglass, but some of it was pretty close to the furnace.

Oh, I cleaned the evap coils twice in the past month also, so I don't think that's the issue.

Greatly appreciate any ideas, and sorry for the long post!

Old 07-15-16, 01:53 PM
Join Date: Aug 2008
Location: Texas, California
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Have you noticed any air flow (or blower speed) changes with the new capacitor ? Insulation is important. Air handler must be insulated. In fact, delta-T 17(75-58) is pretty good, so the problem may be air flow related.

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