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Question:

How do you reduce the high pitch noise of a cold air intake?

I installed a cold air intake into my 99‘ Accord EX. Everything works fine. It has been installed for well over a year. However, I was told that the high pitch noise (caused by air being sucked in) would diminish over time. It has not. Is this normal?

Answer:

Put the original back on and watch the intake temp. drop! That will also take car of that noise Think the air that thing is sucking in is colder than the air outside your car? The original would breathe through the front of the car and dispatch heat from itself. That thing sucks in the air heated by your engine, radiator, exhaust manifold, and A/C condenser.
It is probably your evaporator valve. this is the valve that joins the high pressure side of freon from your compressor to the low pressure side through the evaporator (the expansion of freon from high side to low side gives you the cooling in the coils which air then flows over.) Over time oxidation can start blocking this valve and it whistles until enough cold freon flows through. Your neighbor is right - over time you can get a chunk that blocks this valve then it needs to be replaced and the system recharged. No telling when, or if, this would happen to you though. Make sure the high pitch isn't coming from the compressor (the thing outside with the big fan). If it is, it could be a bearing or a compressor that's failing and that definately needs to be looked at. A tip - call your local electrical union or votech school. They often like to come out and take a look at stuff like this to train their students. They typically will charge you nothing, or very limited, for the labor and the parts will be discounted. (They do appreciate soda and chips while they work, though! As Most service folks!). It could cut your repair bill by a lot. BUT, they obviously don't do emergency repairs or warranty their work so it's not a replacement for knowing the local AC guy. Stay Cool!
thats just standard fare with cold air intakes, thats why most people buy them because they like that noise, if you want to get rid of the noise and have the same benefits you can throw that cold air intake away and just buy a high flow filter like a KN filter and put it in your stock airbox that came with the car and you won't get that sucking noise and will get the same benefit as the cold air intake.

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