For a while now on my 91 FJ80 the high setting on my A/C fan speed does very little. All the other settings work fine. It started intermittently, then just crapped out. A little air comes out, but not high volume like it should. I've seen different posts about the lower speeds relay pooping out. Is there a high speed relay? Wiring problem?? HELP!!!! It's getting way too hot here in Houston!!!