I did not have a single M+S this winter or spring. Now it's 90+ here, so I start running the AC and I get the flashing M+S. Don't run the AC, no M+S. I have run the AC on several occasions in the last couple weeks and didn't get the lights. The hotter and more humid it is, the more susceptible it seems for the M+S lights to appear.

Could it be the battery? The alternator? Condensation from the AC messing with the electrical?

Any suggestions besides rolling down the windows and not using the AC would be helpful!

 

A/C might be straining the battery/alternator too much and dropping your amperage below 13.6A causing the M+S lights to kick on. Get both the bat and alt tested first thing.

 

I'll run by my local parts store tomorrow afternoon and let them do all that fun stuff for me.

Thanks for the advice.