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jimflutes

Loud heater/aircon. sound

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After I just changed my cabin air filter and pulled out a lot of mice nesting material, I put the heater blower up to max.,the sound was loud but not real bad,I thought it may sound like this because I never did turn it all the way up until now,it is fine up to 3/4 ways up. So the service manager at Lincoln said it was not right but would cost 400-500 dollars to take apart and check and if it was do to mice it would not be under warranty. We decided the best move would be to leave it be because I am getting heat and air conditioning, but if I smelled burning I should bring it back. Oh these mice !!!

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Jim are all your vents opened all the way ?

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 That is a good point but I think I did open them up because I wanted to test to see if the charcoal filter made much of a difference in the air quality (it did a little bit). But will do it again just to be sure, and  beside the mechanic at Lincoln ran it to check it out. At this point I can live with how it works ,I had enough heat this winter and air con. seems cold enough ,as long as it does not get worst then it is now.  Thanks

Edited by jimflutes

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As a former auto tech, I've seen this many times. The blower motor and housing almost certainly have debris from the nest. If any of this debris is stuck to the fan blades it will cause the fan to run in an unbalanced condition creating a louder than normal whirring or spinning noise. The fan's cylindrical shape is almost guaranteed to catch any large debris moving through the system as well.

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MediumWilly22, Thank you for your experienced input. I think what you described is what has happened. So do I pay out the $400/500 to Lincoln to have it fixed. Since I do live on a farm,the thing is what if I fix it and the mice get back in and cause the same problem ,the Lincoln mechanic said there is no way to stop mice from getting into the cabin air filter,which I can get into and clean, so I guess the same with the blower motor. I am leaning toward living with it for another two years when I would trade it in for another. Thankfully this is the only problem I have had with this car (2013 MKZh) 

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I'm kind of a neat freak myself, so I would have it cleaned if it was my car. Knowing mouse debris was circulating in my HVAC system would drive me crazy. I have heard of ways to help prevent rodent invasion in automobiles, my brother lives on a farm and has a limited edition Bullitt Mustang that the mice adore as much as he does. He found a device that emits a high pitched sound frequency that is supposed to drive them away, but is inaudible to humans. He believes it worked.

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MediumWilly22 , Well when you put it that way " mouse debris circulating in the HVAC " I am motivated to do something about it. So my first step will be to talk to my local mechanic to see what he feels about this and what it would cost to take apart the blower housing. I stopped the mice from getting into my air filter by fitting a screen in the front of the air intake,but this does not look that simple. Now interestingly, my 07 Accord that I have had now for eight years never had this problem . Meanwhile I am checking on the mice frequency gadget. 

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Talked with my bro. The product was a Victor Pestchaser. He got it at Walmart for $20. Sorry to be so graphic. If you saw what I've pulled out of people's dashes, you would understand my concern.

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Wow, this is a great idea. My car is in a carport away from the house.I am online now looking , there are battery operated sound emitters and also liquid sprays that will not harm any materials ,so I can spray in the engine compartment. Thank you very much for helping me with this .

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If you're mechanically inclined, I would suggest adding meshing to your cabin air inlet. You can use wire meshing or simply screen door meshing. You can use black flush mount bolts/nuts or a high strength epoxy.

 

If memory serves me, the blower motor on the 13’ is somewhat accessible from the bottom of the dash on the passenger side. If you have patience and a little flexibility, you should be able to drop the assembly and clean whatever is floating around in there. 

 

Good luck!

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I agree pjrocco. It may not be that hard to access yourself. Some cars are super easy. I would imagine the Linc is not. A little research and some deft fingers may save you the money though. Happy to help you out Jim!

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Thank you all for the great suggestions ,looks like I have my summer project .  Jim

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