Ignition Switch
Water wetter? What's that? Seriously, I've never heard of it.......
Check your thermostat, too.....I had one on the ol' Toy that would only work about half the time. Cheap and easy to replace, and will save you a lot of grief!!
Also, this may have been mentioned earlier and I'm too lazy to look back for it, check your radiator for clogged, bent, and otherwise mangled fins. Last summer we had a big problem with grasshoppers.....really bad. Those things can trash a windshield in a heartbeat, and no amount of washer fluid would get rid of them. There were times I had to use an ice-scraper to get them off the windshield. Anyway, they got so bad that they totally clogged my wife's Camry radiator and caused it to overheat. Let the engine cool down and use a high pressure spray to blast the crud out of the fins on the radiator.