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09-17-2011, 11:52 AM
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#1
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Member
Alpine Owners Club
Join Date: Oct 2005
Location: Birch Bay, WA
Posts: 51
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Roof AC Noise when Driving
When driving (1998 MDSS) we often hear what sounds like a banging noise coming from the front AC, we recently replaced the shroud, but the noise was there before. I think that it's more prevalent when it's windy as if a flap was banging. We do not run the roof air when driving.
Thanks
Linda
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1998 36' MDSS
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09-17-2011, 01:42 PM
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#2
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Senior Member
Alpine Owners Club
Join Date: Mar 2009
Location: Surprise, AZ
Posts: 836
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Usually the shroud causes all the noise so make sure it's on tight. The mounting screws have a strong tendency to come loose. Otherwise, you might want to take the inside vent cover off and make sure that the long screws holding the AC unit in place aren't loose. This would mean that the entire unit is loose which is not very likely but worth checking. While you have inside vent cover off you might check for something else to be loose up inside as much as you can reach. MAKE SURE THE UNIT IS OFF!!!
Just some ideas ...
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Bob Bowers (Surprise, AZ)
2003 Alpine Coach 40' FDTS
2014 Jeep Cherokee Lattitude
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09-17-2011, 01:50 PM
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#3
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Senior Member
Alpine Owners Club
Join Date: Aug 2007
Location: Long Beach, CA
Posts: 1,563
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You might try removing the shroud, then drive with it off to test. Could be an antenna, dish, or loose solar panel, too. Give everything a tug.
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2003 Alpine 40FDTS (400HP)
Long Beach, CA
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09-17-2011, 02:07 PM
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#4
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 5,932
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The compressor is mounted on three rubber mounts on most A/C's. I have seen these rubber mounts come apart and I have seen the mount bolts break. I have also seen the tubing bounce and hit different parts. Also check the fan mounts they have failed and caused the fan to move too much. Just check the area very closely and look for a wear pattern.
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1998 Pace Arrow 35 ft. F53 Ford V10 2014 Honda CRV toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
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09-17-2011, 02:21 PM
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#5
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Senior Member
Join Date: Mar 2003
Posts: 105
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Are you sure that the noise is from the A/C unit. If you have a satellite dish mounted in front of the A/C, these have been known to make a lot of noise at highway speeds. It has to do with the wind flow over the front of the coach reflecting off of the front of the A/C and lifting the back of the dish from the roof, which again disturbs the air flow, causing it to bang back down again. The process is repeated ad-nausium. One cure is to remount the dish behind the A/C. Another is to ring the dish with 6" aluminum flashing using a piece of slit vinal tubing on the edge to protect the roof. This worked for me.
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Louis & Linda
2005 FDQS
F150 SuperCrew Toad
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09-17-2011, 03:40 PM
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#6
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Senior Member
Join Date: Nov 2007
Location: Charleston, WV
Posts: 3,469
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I get a similar noise occasionally but put it down to the TV antenna. The roof transmits noise easily and it is hard to pinpoint the source.
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John and Mary Knight
2015 Newmar Ventana 4311 - wheelchair accessible
2015 Cadillac SRX Luxury AWD
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09-17-2011, 06:06 PM
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#7
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Senior Member
Join Date: Nov 2005
Posts: 7,400
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If the internal inspection of the AC doesnt provide any issues--try the old crank-down TV antenna or the air horns--older models with the horn bells out on the front leading edge of the cab can catch the wind.
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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09-21-2011, 12:12 AM
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#8
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Senior Member
Join Date: Jul 2006
Location: Newcastle, CA
Posts: 307
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I found the antenna cable to the crank up was flapping in the wind. Duct tape proved it. Now silicone holds it down.
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Dan and Patty
"04" Alpine 34' FDDS 2018 Jeep Grand Cherokee
Newcastle, CA
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09-21-2011, 12:16 AM
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#9
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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We sometimes get a banging noise also, think it's the satellite cable or the over the air antenna wire. Just haven't tried to fix it. Wife wants to go "camping" again soon so I may have a chance to try some duct tape.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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