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07-17-2013, 09:00 AM
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#1
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Member
Join Date: Mar 2013
Posts: 37
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Fan motor noise
New fan motor noise from under dash, that is staying on constantly. What could it be and how do I stop it?
Update: it is the large cooling fan for front radiator.
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Eglhvn1 2006 Coachman EncoreCaterpillar 335 Turbo, freight liner chassis
Allison 6 speed
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07-17-2013, 09:12 AM
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#2
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Senior Member
Join Date: Nov 2005
Posts: 7,383
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"NEW fan motor----staying on constantly"??????? Does this mean you recently replaced/had the fan replaced? Sounds like a wiring issue? New motors usually dont have bearing issues but fan cage could be rubbing on cowling--needs adjusting. If a replacement fan/motor, are you sure it was the proper size/volts?
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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07-17-2013, 09:15 AM
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#3
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Community Moderator
Newmar Owners Club
Join Date: Feb 2011
Location: Point Pleasant Beach, NJ
Posts: 31,248
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Are you running anything like AC or defroster? Did it just start? Is it an unusual noise or just the sound of a running fan?
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Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
No amount of money can buy you an extra second of time.
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07-17-2013, 09:18 AM
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#4
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 5,926
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Since you have a diesel, It could be the vacuum pump. Your heater controls are most likely vacuum operated and since diesels have no vacuum, they have to have a pump. If you have developed a leak in the vacuum line, It would cause the pump to run all the time.
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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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07-17-2013, 10:07 AM
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#5
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Member
Join Date: Mar 2013
Posts: 37
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Found the fan under the coach, attached picture on original post. Was able to disconnect the fan to turn it off. Is this fan controlled by a thermostat? How should I proceed?
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Eglhvn1 2006 Coachman EncoreCaterpillar 335 Turbo, freight liner chassis
Allison 6 speed
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07-17-2013, 10:21 AM
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#6
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,269
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The A/C condenser cooling fan , is usually tided to the A/C compressor operation , and should run any time the compressor is active.
So if the fan runs when the dash A/C is turned off, I would suspect a sticking relay in the systems wiring.
If the fan only runs when the A/C is on then , I'd consider the operation normal; and if the fan noisier than before , you need to look for damage on the blades that could be setting up the new noise.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-17-2013, 10:47 AM
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#7
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Member
Join Date: Mar 2013
Posts: 37
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Would I be correct to assume since I was able to unplug the fan, if I don't operate the dash AC , I can continue to operate as normal until I can get the sticky relay corrected? Could I plug the fan back in and use the AC and then unplug when not in use?
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Eglhvn1 2006 Coachman EncoreCaterpillar 335 Turbo, freight liner chassis
Allison 6 speed
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07-17-2013, 11:26 AM
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#8
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,269
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Quote:
Originally Posted by eglhvn1
Would I be correct to assume since I was able to unplug the fan, if I don't operate the dash AC , I can continue to operate as normal until I can get the sticky relay corrected? Could I plug the fan back in and use the AC and then unplug when not in use?
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Your correct , that fan is only used in the A/C system. If you run the A/C OR DEFROST, without that fan , the system will build pressure and quit working.
When in defrost , the A/C cycles to de-humidify the air blown onto the windshield to prevent fogging.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-17-2013, 11:28 PM
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#9
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Member
Join Date: Mar 2013
Posts: 37
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Thanks so much for all the help. Learned a lot today. Won't be able to fix the problem, not experienced enough to trace a sticky relay, but feel great that I can move safely down the highway tomorrow without harming my home. Will try to get problem fixed at next stop.
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Eglhvn1 2006 Coachman EncoreCaterpillar 335 Turbo, freight liner chassis
Allison 6 speed
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07-17-2013, 11:37 PM
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#10
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Senior Member
Join Date: Apr 2012
Posts: 1,414
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Ac condenser fan. There is a pressure switch in the liquid line to turn the fan on when high side pressures reach a set pressure. This switch may be stuck on or a relay may be stuck. The switch may be above the genne on the smaller ac hose. When you find the switch just unplug to see if fan quits. I would not use ac or defrost with the fans disconnected as the high side pressures will reach high enough pressure to open relief valve on compressor.
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Dave and Laura & two cats
02 Discovery with Accord toad
retired auto rv tech and teacher, wife rt nurse
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07-17-2013, 11:38 PM
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#11
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,269
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Safe travels.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-17-2013, 11:51 PM
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#12
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Member
Join Date: Mar 2013
Posts: 37
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Quote:
Originally Posted by stink
Ac condenser fan. There is a pressure switch in the liquid line to turn the fan on when high side pressures reach a set pressure. This switch may be stuck on or a relay may be stuck. The switch may be above the genne on the smaller ac hose. When you find the switch just unplug to see if fan quits. I would not use ac or defrost with the fans disconnected as the high side pressures will reach high enough pressure to open relief valve on compressor.
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Thanks for the info. I'll try finding the switch in the morning.
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Eglhvn1 2006 Coachman EncoreCaterpillar 335 Turbo, freight liner chassis
Allison 6 speed
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07-18-2013, 02:33 PM
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#13
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Senior Member
Join Date: May 2013
Posts: 962
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and if you were desperate and wanted ac just plug it back in!
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American Revolution 40L CAT C9
Samsung 197, TireMinder, Ready Brute Elite with Wrangler
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