Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
2007 Mazda6 radiator replacement, now no crank no start
So I recently had to swap out my radiator and upper hose from it leaking and causing me to overheat. After replacing everything, I started it up and it ran for about 30 minutes or so. I shut it off and when I went to turn it over and all I heard was a little click sound when I tried to crank. Afterwards there is a humming sound coming from the right side of the engine. Tried to jump start it with no luck. Swapped the battery out and still nothing. I put a code reader on it and two codes pop up (P0134) (P2251) about the sensor 1 and bank 1. I stumbled across this page and I don't want to be a parts changer if I don't have to. From the few I watched on here, it might be the starter or the wiring from the battery to it. Or possibly something from the radiator swap. I have super limited experience on fixing my own car but would love any help I can get. Thank you
If the humming is coming from the starter motor I'd try barring the motor over with a socket on the crank bolt. Might be hydrolocked considering the vehicle history.