Heater Fan problem

Hello everyone,


New to the group here, but I do have a question.

Last year sometime, my heater fan just stopped working. Occasionally it would just turn on for no reason at all, (a small bump in the road) During that time, the fan did not make any strange noises or anything like that, so I'm thinking it's the fan relay switch.... Question is... where is that little thing?



Thanks in advance,
Dr. Woo