03-17-2016, 05:43 AM
cbelt3 wrote:
Remove the cabin filter. Check it. Vacuum it off. Put it back in. Done.
Remove the air filter. Check it. If it's gunky, replace it. If not, don't.
That's not a valid test of a filter. A filter may look perfectly OK even when it's filtering capacity is drastically reduced due to clogging by very fine material and vacuuming is unlikely to remove this material. If you're running charcoal impregnated filters this is even more apt since it is impossible to visually gauge whether the charcoal capacity has been exceeded.