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09-13-2021, 01:50 PM
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#1
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Member
Join Date: Jul 2020
Posts: 47
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High pitch squeal coming from A/C unit
Hi, my rooftop ac started to squeal, can anyone direct me on what it could be? It also makes the same noise when the fan only.
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09-13-2021, 02:27 PM
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#2
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Senior Member
Join Date: Mar 2017
Location: Sarnialabad, Peoples Republik of Canuckistan
Posts: 2,225
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Check the fan bearings.
__________________
2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 Wrangler JKU (sold @ ????) - 2016 Sunstar 26HE (sold @ 4600 miles) - 2002 Roadtrek C190P (sold @ 315,000kms)
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09-14-2021, 07:02 AM
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#3
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Senior Member
Tiffin Owners Club Winnebago Owners Club
Join Date: Feb 2012
Location: Las Cruces, NM
Posts: 4,040
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Especially the evaporator squirrel cage fan.
__________________
Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)
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09-20-2021, 03:47 AM
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#4
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Senior Member
Join Date: Apr 2020
Location: Crossville, TN
Posts: 354
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How can anyone give you an answer. You need to go on the roof, take off the AC cover, start unit to hear where the noise is coming from and go from there. If you do not hear it from anything there, then remove the inside ceiling cover and listen there also for the blower fan.
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2024 Jayco Class B 20T
Added rear swing away storage Box
Ladder w/Spare Tire mount(And tire)
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09-20-2021, 03:55 AM
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#5
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2010
Posts: 1,799
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Well, description is pretty good. Makes noise with fan only. Fan has bearings...bearings can go dry and squeal.
__________________
Scott Brownstein
Palm Island, Florida
2015 Georgetown 335DS
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09-20-2021, 09:24 AM
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#6
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Moderator Emeritus
Ford Super Duty Owner
Join Date: Aug 2000
Location: Bryan, TX when not traveling.
Posts: 22,948
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Either fan motor bearings or a fan dragging and hitting the housing.
Ken
__________________
Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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09-24-2021, 06:45 AM
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#7
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Senior Member
Tiffin Owners Club Winnebago Owners Club
Join Date: Feb 2012
Location: Las Cruces, NM
Posts: 4,040
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Fan only is the squirrel cage fan used for the evaporator. Replace it.
__________________
Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)
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09-25-2021, 09:14 PM
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#8
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Senior Member
Gulf Streamers Club Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 4,343
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While fan bearing squeal is first suspicion, also possible is frozen evaporator, or wasp/ mud dauber nests, or loose/ bent fan blades. Descriptive words are subjective?
__________________
(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10 
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