Caddy catera won't crank at all in warm/hot weather?

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EventHorizon

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I have a 99 Cadillac Catera with 90K miles on it. I'm in Florida so all this time the weather was pretty cool, consistently under 75. The car had no starting problems at all. But now it starts getting warmer, above 80, and suddenly I have starting problems. When I turn the key, it doesn't crank at all, as if it weren't sending an electric signal. The battery btw is under a year old. I checked with a multimeter and it has fine charge. The car will start with jumper cables. The car experience this ONLY when it has been driven a while and then I try to turn it on again. The car starts fine AFTER about 20-25 minutes.. I assume because it is cooling down. This is frickin weird, what components and things should I start looking at?
 
could be as simple as poor connections at the battery. clean with a wire brush and have battery tested for free at auto zone as even a relatively new battery can fail under load. heat issues can relate to a failing coil or other sensor like the crank sensor, but you will need a mechanic with a scanner to "see" what is going on, by plugging into your cars computer at the OBD outlet.
 
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