98 base lumina, 3.1 about 275,000 miles on it.
Problem =--a/c often defaults an blows cold thur the defroster area.
My mobile mechanic is honest and highly skilled, drives a lumina and has been to Chevy factory training in Lumina days.
I bought a new vacuum resevoir ball. He tried that idea. He tested several vacuum lines and did various things all with no success. He thinks it may have something to do with one or two solinoids under the dash , behind the glove compartment.
Any idea,s will be appreciated.
It is very toasty in south Louisiana nowadays.