Ummmm No.
Why should/would any of us any of us want to prove out what you "hear"?
Are you using the old coolant recovery tank spot with an alky tank? That is my set up.
I live in Phoenix AZ, sometimes I drive my car in the searing 110 degree summer heat, once in a while I run her with the A/C on and can almost guarantee the under hood temps tickle, if not exceed 155 degrees.
I haven't ever witnessed the methanol "boil".
Nor have I experienced "boiling" in the lines when running around in the high heat.
One of my best friends (twin turbo BMW w/ methanol injection) warned me of the danger. My builder, Lou Czarnota, had a differing opinion, he didn't say "do it" but he was fairly confident that Julio's set up wouldn't "boil" unless I was being a complete dumbass. I try to avoid the dumbass scenario as much as possible, but I miss the mark..... often.........

Here's what I have discovered:
If it's hot outside, don't romp on your car, if you do, expect to pay for the consequences.