Air Conditioner noise

[djScott]

Hello, Going to Kentucky next week and thought I would ask for help. I have a noise coming from my rear Air through the vents? My air works fine except for the noise. The noise is a variable noise that sounds like its coming from the vent. Do I go up on roof to inspect blower? Thanks!

[H. Miller]

The blower is in the MH under the A/C.
What seems to make the noise increase or decrease? What sort of noise is it? When were the filters last changed (cleaned)?

[NMBeemercouple]

I recently had a noise coming from one of the A/C units (bedroom). Turned out to be a mud dauber nest in the fins of the blower fan. Take off the cover and check it out. I was so worried it was a bearing or some other failure.

[djScott]

thanks for your help! I bought the MH last Sept have not replaced filter or looked at blower. How hard is it to remove AC to get at blower?
2005 Mountain Aire

[NMBeemercouple]

There are four bolts holding the plastic cover down. Lift it up and replace the same way since there is foam glued to the lid to keep the air flowing thru the fins. Just look inside for obvious mud nests. Be careful on top but is easy to do. The filter is on the inside on the large intakes (hinged door). They say to check them once a year to clean out the fins with compressed air to keep it efficient, but those bugs can work fast once they get inside the cover.

[Gary RVRoamer]

Your a/c has two fans on one motor shaft. One is inside and circulates chilled air, and the other is outside and draws outside air over the external coils to get rid of heat. The inside fan is a squirrel cage type and doesn't usually get anything caught in it (there is afliter in the air intake), but the outside one is a propeller-type that can suck up all sorts of junk or get critters in/on it. Pull the outside cover off and take a look.

["007"]

As GARY said you take cover off AC on roof 4 screws have to be removed. There is no access to AC from inside your coach. Inspect for critters in fan drums or just maybe leaves or pine needles.
Your filters are located in ceiling grill vents, foam filter will be on left side looking toward rear. You place you fingers through vent grill louvers turn vent and pull down as you turn. Vent grill will pop loose and foam filter will come with it. This link will show you the filters and how to clean. Scroll down the link for view.

[dday53]

We had a very similar problem about 3 wks ago and yes...it was a mud dauber mess on the fan blade. It was difficult to get in there to remove completely but cleared up the noise and vibration!

[djScott]

Thanks for every ones help. Went on roof cleaned coils cleaned blower cages, found a piece of masking tape that may have been making noise also found aluminum tape that may have been making noise. The noise is much reduced. Thanks!