The wife's chariot isn't blowing A/C. I can feel cold air at the vents when moving but the blower will not come on. Periodically, usually when the outside temps drop (late afternoon & evening) the blower will start working and everything is fine but in the heat of the day, no blower.
Am I looking at the PB switches or one of the ECU's? Is there a method by which I can refurb the PB's?

__________________
1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)