ok so its about 90 degrees outside and while driving down the road my O/D would not kick in. so I pulled over stopped the car and cut it off. let it sit then turned it back on. the first time the light kept blinking and still wouldn't got into O/D the second time it didn't blink and drove fine. my question is what is causing this to happend? bout to move back to maryland in a couple of months and don't want nothing major on the ride home