Thanks for the reply it’s going to be helpful. The fan resistor is mounted on the left front frame rail and that’s where I’ll start.

Engine fan runs in hi speed when ac or defrost is on
I have 2 2006 vibes and one of them the engine fan is much quieter when the defrost or ac is on. One vibe you can hear it coming because the engine fan is running on high speed.

I have 2 2006 vibes and one of them the engine fan is much quieter when the defrost or ac is on. One vibe you can hear it coming because the engine fan is turning so fast. I’ve swapped the fans between cars and the problem stays the same. The vibe engine fan has 2 speeds. When the defrost or ac is o...