GLK 350 squealing sound p2279 coed
#1
GLK 350 squealing sound p2279 coed
After 5-10 minutes running loud squealing sound . Took belt off to make sure it wasn't a pulley or alternator. Sound is on left front of engen. I replaced the o ring on the tube that ever one said goes bad but did not fix so now what? How do I find air leak?