Do you mean the starter won't engage? If that is the case and it only happens in extremely hot weather, it could be the starter or even the starter relay.
When it won't start, here is what I suggest. First, just to confirm it isn't an issue with the neutral safety switch, see if it will start in neutral. If there is no change, I need you to check for power at the starter.
If you are comfortable doing this, there will be two wires at the starter motor. One is a heavy gauge red wire that will have 12v at all times. There is a smaller gauge wire which is purple. The purple wire will have no power until the ignition key is turned to the start position. So, have a helper turn the key to the start position while you check for 12v at the purple wire on the starter. If you have 12v, the starter is going bad. If there is no power, we need to work backward to see where power is lost.
I attached the wiring schematic below for your review. Additionally, here is a link that you may find helpful:
Let me know what you find or if you have other questions.
See pics below.
Images (Click to enlarge)
Wednesday, June 22nd, 2022 AT 8:57 PM