greetings tsikoteers!

i have small problem with my corolla '89 lately, not big enough for me to panic though, pero mejo irritating lang sya nonetheless.

When the car is in motion, i hear this light grinding sound sa bandang harap ko, parang sa dashboarsh mismo, sorta like the sound made when we grind our teeth. Ganun lang. And the faster i go, parang sumasabay ung bilis din ng grinding sound. Adding to this weirdness is the fact that hindi sha constantly lumalabas. Me times na whole day ko gamit ung kotse, walang ung sound. Other times naman, whole day sha andun. I'm baffled at this point as to where the sound could be coming from. I recently had me tires checked (bearings, balancing, alignment, etc.) so i know wala na dun ung problem.

Any ideas?