My generator runs for twenty minutes to a half hour, then shuts down. Leave it for a while, and it starts up and a half hour later, it shuts off, and so on. It's been mid 90's here temp wise, but if heat is the problem, what do folks in the desert do? The generator was serviced last week, and they discovered the problem and can't correct it. It's made by Onan, out of a 91 Winnebago, but the generator only has 146 hours on it. Any ideas? I'm stumped.