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07-07-2019, 10:23 PM
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#1
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Senior Member
Monaco Owners Club
Join Date: Jun 2012
Location: South Weber, UT
Posts: 126
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Engine AC compressor squeal
We just returned from a week long trip and as we started out on the trip, I would hear a squealing noise (for a few seconds) from the engine compartment at startup. We’re home now, and I moved the MH today and the squeal returned and stayed on for more than 10 seconds.
When I turned off the dash AC, it would stop. When I turned it back on, it returned. It looks like a problem with the AC compressor. Does anybody have any advice on how to further diagnose the problem or recommendations? Is it the AC clutch? If it is, can it be replaced without recharging the system?
Our MH is a 2005 Cayman 36 PDQ with 20k miles on it.
__________________
2005 Monaco Cayman 36PDQ
Toads: 2018 Equinox, 2008 HHR or 1993 S10 with ATV in bed
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07-07-2019, 11:01 PM
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#2
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Senior Member
Monaco Owners Club
Join Date: Sep 2008
Location: McCleary,wa
Posts: 375
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My coach has a separate belt for AC, is it tight? If its just 1 serpentine belt the same goes. I overcharged the refrigerant in a car I had and it caused the pump to slip the belt when turned on, then would run fine, I released the pressure and all was well.
Hope it's that easy.
John G
__________________
John and Cherrie
2003 Holiday Rambler Scepter 40DST
Pushed By 2003 Ford Explorer
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07-07-2019, 11:05 PM
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#3
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Senior Member
Monaco Owners Club
Join Date: Jun 2012
Location: South Weber, UT
Posts: 126
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I think the belt is a single serpentine and replaced last summer. The tensioner could be going soft but is that a common failure mode for them?
__________________
2005 Monaco Cayman 36PDQ
Toads: 2018 Equinox, 2008 HHR or 1993 S10 with ATV in bed
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07-08-2019, 02:28 AM
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#4
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Senior Member
Monaco Owners Club Vintage RV Owners Club
Join Date: Sep 2014
Location: anywhere U.S.A, Currently back home in Thailand!
Posts: 4,245
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" Is it the AC clutch? If it is, can it be replaced without recharging the system?"
Yes the A/C clutch can be replaced and it will not affect the charge!
You can try to tap on the clutch with the motor running, A/C not on, to see if you can dislodge the clutch dust! Take a air hose and blow it out good also! That may work for you, but I would get a replacement clutch and belt anyway, as you will need it sooner or later! Rail!
__________________
Retired, and "Always on Holiday!"
1996 Monaco Windsor 38PB, "Mona" 275 HP., 8.3 Cummins, 3060 Allison 6 speed, 2001 PT Cruiser, "Bailey"
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07-08-2019, 04:51 AM
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#5
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Senior Member
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 8,300
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You can rub some bar soap or spray the belt with a bit WD40. To see if it's just the belt it will quite down. If its the clutch and or its bearing.You can rent AC clutch puller from Autozone and other parts stores.
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
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07-08-2019, 07:56 AM
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#6
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Senior Member
Monaco Owners Club
Join Date: Jun 2012
Location: South Weber, UT
Posts: 126
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Would the squeal be caused from the clutch slipping or from the compressor starting to seize up and the belt slipping?
__________________
2005 Monaco Cayman 36PDQ
Toads: 2018 Equinox, 2008 HHR or 1993 S10 with ATV in bed
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07-08-2019, 02:12 PM
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#7
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Senior Member
Join Date: Nov 2014
Posts: 1,670
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Quote:
Originally Posted by rschreifels
Would the squeal be caused from the clutch slipping or from the compressor starting to seize up and the belt slipping?
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First thing I would look at is the condition and tension of the belt and for proper installation.
If adjustable and loose ....you can adjust it as necessary.
If it uses a spring loaded tensioner? you want to make sure that the tensioner marks are in the correct place once the belt is installed.
Most spring loaded tensioners have marks on them with an arrow to make sure that the belt is the correct length so that the tensioner can work within it's tensioning range proberly. IMC ther should be marks like this one here ( pic for example only )
The squealing noise is on startup only? that leads me to believe that it may not be a compressor issue or clutch issue. ...I would be looking at what other accessories that belt may also be driving.
Happy Hunting
__________________
2004 HR Navagator 500 ISM
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07-08-2019, 06:26 PM
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#8
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Senior Member
Monaco Owners Club
Join Date: Jun 2012
Location: South Weber, UT
Posts: 126
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Quote:
Originally Posted by RobRoy
First thing I would look at is the condition and tension of the belt and for proper installation.
If adjustable and loose ....you can adjust it as necessary.
If it uses a spring loaded tensioner? you want to make sure that the tensioner marks are in the correct place once the belt is installed.
Most spring loaded tensioners have marks on them with an arrow to make sure that the belt is the correct length so that the tensioner can work within it's tensioning range proberly. IMC ther should be marks like this one here ( pic for example only )
The squealing noise is on startup only? that leads me to believe that it may not be a compressor issue or clutch issue. ...I would be looking at what other accessories that belt may also be driving.
Happy Hunting
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It will be a few days until I can check out the marks on the tensioner. But it squeals only when I turn on the AC, and stops when I turn it off. I'm just hoping its not the compressor
__________________
2005 Monaco Cayman 36PDQ
Toads: 2018 Equinox, 2008 HHR or 1993 S10 with ATV in bed
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07-16-2019, 09:24 AM
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#9
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Senior Member
Monaco Owners Club
Join Date: Jun 2012
Location: South Weber, UT
Posts: 126
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Update: Now there is no squealing at startup or any other time. We just returned from a 400 mile trip using the AC and had no problems.
__________________
2005 Monaco Cayman 36PDQ
Toads: 2018 Equinox, 2008 HHR or 1993 S10 with ATV in bed
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07-16-2019, 02:20 PM
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#10
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Senior Member
Monaco Owners Club
Join Date: Jun 2011
Location: CA
Posts: 4,457
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Quote:
Originally Posted by rschreifels
Update: Now there is no squealing at startup or any other time. We just returned from a 400 mile trip using the AC and had no problems.
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Is the belt reasonably tight? I don't have a tensioner on that belt. The compressor is on a swivel and you can tighten the belt by rotating the compressor.
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Bill & Brigitte
06 Windsor PEQ, Cummins 400 ISL
2014 Honda CRV or 2012 Jeep
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07-16-2019, 04:20 PM
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#11
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Senior Member
Join Date: Nov 2014
Posts: 1,670
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Keep in mind serpentine belts don't need to be very tight ...with having 4-5 even as many as 6 ribs, they have plenty of bite and overtightening it can quickly take out the a/c compressor bearings the compressor itself and any other accessories that the belt drives.
If you don't have spring-loaded tensioner ..you should be using a tension gauge to set the tension but many of us don't have a tension gauge and the reason for me saying use caution not to over tighten when tightening if it's adjustable.
I suspect a spec of rust or other contamination on one of the drive pulleys.
IMO Inspect the belt and pulley if looks good go with it ..you be the judge.
Happy Trails
__________________
2004 HR Navagator 500 ISM
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07-16-2019, 04:39 PM
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#12
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: May 2016
Location: Kamloops, BC, 60 miles from the Center of the Universe according to the Rinpoche, of the SF monks.
Posts: 7,321
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If you suspect a slipping belt, get a spray bottle of water and give it a spray on the ribbed side while it's running.
It will quiet down immediately if it's a slipping belt.
This will work on a noisy belt as well. Sometimes a bit of sand will get in the grooves and make noise also.
It's an old trick we used in the truck repair business for years. Simple and free.
Happy Glamping.
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Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!
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07-16-2019, 04:47 PM
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#13
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Senior Member
Join Date: Aug 2018
Posts: 248
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Gates gives away a special little plastic tool to test serpentine belts to see if they're worn.
A mechanics stethoscope can also find squealing bearings.
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07-16-2019, 10:54 PM
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#14
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Senior Member
Monaco Owners Club
Join Date: Jun 2012
Location: South Weber, UT
Posts: 126
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I do have a spring loaded tensioner and I replaced the belt last summer after we purchased the MH.
We live not far from two gravel pits and have a fair amount of canyon winds in the morning carrying a fine dust with it. The squeal started after setting outside from February until June. With the squeal gone now, I'm hoping it was just the fine dust on the belt and there is no upcoming failure
I'll update if anything changes. Thanks for the suggestions/help!
__________________
2005 Monaco Cayman 36PDQ
Toads: 2018 Equinox, 2008 HHR or 1993 S10 with ATV in bed
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