Upon start up loud ticking or knocking noise from pass side, lasts about 10 seconds. Same noise with a/c on or off and with defroster on or off, seems to lessen if recirculate button is engaged. Reoccurs again about 1 to 2 min after engine is shut off. have looked behind glove box for loose or broken vacuum lines and looked where cab filters go but found nothing.
Nov 2, 2013 at 10:20 PM
