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Old 07-17-2013, 10:00 AM   #1
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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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Old 07-17-2013, 10:12 AM   #2
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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 07-17-2013, 10:15 AM   #3
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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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Old 07-17-2013, 10:18 AM   #4
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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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Old 07-17-2013, 11:07 AM   #5
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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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Old 07-17-2013, 11:21 AM   #6
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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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Old 07-17-2013, 11:47 AM   #7
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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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Old 07-17-2013, 12:26 PM   #8
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Originally Posted by eglhvn1 View Post
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?
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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Old 07-18-2013, 12:28 AM   #9
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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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Old 07-18-2013, 12:37 AM   #10
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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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Old 07-18-2013, 12:38 AM   #11
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Old 07-18-2013, 12:51 AM   #12
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Quote:
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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.
Thanks for the info. I'll try finding the switch in the morning.
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Old 07-18-2013, 03:33 PM   #13
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and if you were desperate and wanted ac just plug it back in!
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