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CrestonM 
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Joined: 08 Sep 2014
Location: Oklahoma
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 Topic: Home A/C Question
Posted: 19 Jul 2018 at 10:07pm |
We have two A/C systems for our house, and both are 26 years old (I think we've been lucky). They have been trouble free all those years. The outside condensers are Trane, and they are identical units (consecutive serial numbers in fact). The problem now is one condenser makes an awful racket when the fan shuts off. It starts up perfect and runs great, just purrs and barely makes any noise, until it shuts off. Then it makes a racket like you threw a large tree branch into the rotating fan. At times when I've been out in the yard and heard it make the noise, it's made me cringe. The other condenser runs just as it should, and when it shuts off, it does so quietly. I've looked at the problem condenser, and nothing appears loose or out of the ordinary. It's nice to have an identical unit to compare it to, but so far it hasn't helped find the problem.
Any ideas?
Thanks
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shameless dude
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Joined: 10 Apr 2017
Location: east NE
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Posted: 19 Jul 2018 at 11:51pm |
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fan loose? bad bearing?
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desertjoe
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Joined: 23 Sep 2013
Location: New mexico
Points: 13696
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Posted: 20 Jul 2018 at 6:00am |
Ditto what ole Shameless says,,,must be the change of motor RPM that indicates a bearing in motor or fan,,,,
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
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Posted: 20 Jul 2018 at 6:14am |
don't know how a 'bad bearing' could create the noise but... perhaps a fan blade has lost a rivet or two ? Saw a post here about a tractor losing part of a blade ($$$ to the rad !!) Whern inspecting be SURE to power off the units !! Pull the disconnects next to them. You don't want one of them powering up when you're in them. The fan won't kill you, but the scare will jolt you, you'll fall back, trip over the wheelbarrow and land into the smouldering firepit...
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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Dave H
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Location: Central IL
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Posted: 20 Jul 2018 at 6:51am |
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If you can get your mitts on the fan like unscrewing a shield, I would go hands on and rotate and shake the blades around to check them and look for a bad bearing.
circuit breaker off of course.
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BKarpel
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Joined: 27 Apr 2012
Location: Collinsville IL
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Posted: 20 Jul 2018 at 7:45am |
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Check out the fan blade. I have seen some where the pressed in hub gets loose and the fan starts slipping. Sometime it gets so bad the motor no longer turns the fan. They make all kind of wired sounds then. You can pull the top off the AC and check the bearing for play. You can buy a new condenser motor and replace it fairly easy and reasonable your self if needed.
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desertjoe
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Posted: 20 Jul 2018 at 9:02am |
"" don't know how a 'bad bearing' could create the noise but...""
TSK,,,,TSK,,,,
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CrestonM
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Location: Oklahoma
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Posted: 20 Jul 2018 at 9:38am |
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I'll check that out this evening. I figured if it were a bearing, it would make some kind of noise all the time, but it just starts up and purrs real quiet when running. Only when it shuts off that things go "Bang!"
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chaskaduo
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Location: Twin Cities
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Posted: 20 Jul 2018 at 10:15am |
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Had an old chest freezer that made banging noises when the compressor shut down. It turned out to be loose mounting bolts. HTH
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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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Ted J
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Location: La Crosse, WI
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Posted: 20 Jul 2018 at 10:53am |
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Agree with chaskaduo. They don't make noise powering up because of the pull, but when they are shutting down they tend to vibrate more, thus the shaking of the mounts.
See ya in a week buddy!!
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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
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CrestonM
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Posted: 20 Jul 2018 at 2:27pm |
I'll check this all out. See you soon, Ted! Hopefully the A/C doesn't crater...it was 112 degrees yesterday, and will be hot again today. I'm ready for a little northern escape!
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desertjoe
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Posted: 20 Jul 2018 at 8:16pm |
I've had grinders and other motors get obviously louder when shutting down that turned out to be bad bearings,,,then again,,I've had em be rattling while running so take your pick,,, By the way,,,,,Good Luck, Creston 
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CrestonM
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Posted: 20 Jul 2018 at 9:00pm |
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Well I didn't get to it today. I had another project staining a deck/porch and that took longer than I thought it would. It is next on the list of things to repair around here, though. Have something scheduled at my grandparents' place the next couple days, so may be Monday before I can get to it.
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shameless dude
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Posted: 20 Jul 2018 at 9:09pm |
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grab an old 190XT fan, mount it on a pulley, run one of them long belts off the back of your 66 combine, puts it on an electric motor off to the side, can make a belt tightener outta yer ferd tractor!
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desertjoe
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Posted: 21 Jul 2018 at 7:00am |
UMMmmm,,,,,UMMmmmm,,,Shameless,,,uhm,,,seems as if they is something missin on thet contraption you is suggesting,,,,,oooops,,!! forget it cause you prolly WILL add more stuff to it just to throw ole Creston a curve,,,,, 
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chaskaduo
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Posted: 21 Jul 2018 at 7:39am |
Is it kinda like the snow machinimo? 
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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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CrestonM
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Posted: 21 Jul 2018 at 8:24am |
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Now Shameless you really expect that Ferd to hold up against that kind of "tension" in the summer heat??? Lol
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shameless dude
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Posted: 22 Jul 2018 at 12:47am |
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well...you might hafta tie that ferd to a tree!
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LouSWPA
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Posted: 22 Jul 2018 at 8:07am |
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has anybody actually seen Shameless and Red Green in the same room together?
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I am still confident of this;
I will see the goodness of the Lord in the land of the living.
Wait for the Lord;
be strong and take heart and wait for the Lord. Ps 27
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Ted J
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Posted: 23 Jul 2018 at 6:12pm |
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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
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bradley6874
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Posted: 23 Jul 2018 at 7:13pm |
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Pull the disconnect remove the cover from the side follow the fan wires and unplug one wire secure it so it won't touch now put disconnect back in and let it start and run a couple min then turn off this will tell you if noise is fan or compressor
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You can wash the dirt off the body but you can’t wash the farmer out of the heart and soul
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CrestonM
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Posted: 23 Jul 2018 at 8:55pm |
 bradley6874 wrote:
Pull the disconnect remove the cover from the side follow the fan wires and unplug one wire secure it so it won't touch now put disconnect back in and let it start and run a couple min then turn off this will tell you if noise is fan or compressor |
Did this this evening. I'm thinking it's in the compressor now. When turned off, it shook a little and made the noise. I don't know much about A/C, so I may just need to get a pro in to swap it out. I'm guessing they have to "catch" all the old Freon when unhooking the compressor.
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steve(ill)
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Posted: 23 Jul 2018 at 10:02pm |
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at 26 years old............ might be time to look at an upgrade system ?
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Like them all, but love the "B"s.
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bradley6874
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Posted: 24 Jul 2018 at 11:45pm |
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If it's R22 it's not worth putting a compressor in it we charge $100 per pound for 22 roughley ,700$ for ref 4-6 hrs at 100$ per hr and cost of compressor and not much in warranty if it's just noise letter run and start saving up for replacement of the system
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You can wash the dirt off the body but you can’t wash the farmer out of the heart and soul
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Grayray
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Posted: 25 Jul 2018 at 5:38am |
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Hate to be the bearer of bad news, but at 26 years old, I think you are fixen to write a check for about $5000.00.
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