Where the heck is the rear defroster relay? Options

[CheesyLobster]

Like the title says. My rear defroster has not been working for a long time. I checked that my contacts are good and the wiring running to the back is good. My fuse is ok and is getting power when the switch is on, so that seems to leave the relay as the culprit. However, I cannot for the life of me locate the damn thing. I’ve checked diagrams and they seem to indicate that it is somewhere under the left dash side with the fuses, etc. I hear it click when I turn on the heat, but still cannot locate it. Where is it!?!

Any help appreciated, thank you!