QUOTE(Fazri9900 @ Dec 28 2011, 09:50 PM)
Check the air filter already..already 1/4 is covered by black spot..but the smell cannot tahan..have to change with a new one..
After reading the post about air filter, I took out mine just now and inspected it under bright light and magnifying glass. I think it looks black not only because it is a bit dusty, it is also because the filter got a layer of carbon material sandwiched in between the paper surface (I supposed for bad smell absorption). I wonder why the replacement filter we are getting from the service center is pure white instead of the same type that comes with the brand new car.
The following is what I had done with my filter, as I am no where near to visiting the service center for a replacement, and I was thinking, what the heck, just try it, if it works, I save the money by not replacing the filter (cause apart from the bad smell, the filter still looks relatively new), if it doesn't, I will just throw it away and but a new one from parts shop tomorrow morning.
I knocked my filter lightly on floor, can see dust fly out and some very fine sand particle get dislodged. Blowed it lightly with air blower and brushed with paint brush, knocked lightly again, repeat the procedure a few times until I am quite confirmed all the dust and sand I can get rid off were already out. At first I am thinking of flushing it using light flow of water, but worried it may damage the glue holding the filter together or even distort the paper/carbon layer, so I gave up that idea (this filter was not designed to be washable anyway).
After physical cleaning, I put it near my nose and smell it, confirmed, that's the mouldy smell I am getting from my aircond everyday (especially when compressor is off for long and air gets a bit warm during auto-stop). So for the smell part, first of all, I sprayed the filter lightly with Febreze, leave it to absorb and dry a while, then i blow the filter using mild warm (hand touchable) heat with a hair dryer (becareful not to put the hairdryer too close or use too high temperature as hot hair will damage the paper surface and melts the glue). You can repeat this setps if you are still not satisfied, but I would say the bad smell on my filter was about 90% gone after the first round (not sure that's the effect of the Febreze or because of the mild heat from the hair dryer, don't care, as long as it works).
Anyway, credit and great thanks to members of this forum that brings up the topic, sharing the steps (summore with pictorial guide, this is better than Honda's website FAQ) for the benefit of all other members.