Had an issue with my AC and took it to dealer to diagnose. They stated it needed a new fan (since high speed wasn't working) and a control module. Bought both of the items and had them installed by my mechanic. I notice my fan is not turning on. I unplugged the new fan and plugged in the old one and that one doesn't function either (it was functioning fine in low speed but not high speed). So i'm led to believe it's not the fan but rather either a relay or something else. The relays are cheap but I'd like to know if there's a way to find out if it's a relay, and if it is, is there a way to test to see which one is the culprit? There are 2 relays: 1 is listed as a "glow plug" and the other is just listed as a relay. Any advice on how to fix this issue?