H2 hummer will start when it sits for awhile but when I stop for a few minutes and try to start again takes 3 or 4 cranks before it starts , every time I shut it off for a few minutes , it takes awhile for it to start, any suggestions

 

there are many suggestions but are there any codes or security lights on? before firing up the parts cannon.

 

had a coolant temp sensor code that I haven't taken care of that's it

 

coolant sensor can keep the truck from starting. the PCM is highly dependent of it. it would be located near the front of the drivers exhaust manifold P/S bracket area. bolted to the head. not very big.

 

Ok just picked it up and will be installing today , I'll post and update after, thanks

 

^^^^^^^^^^Yeah, what he said^^^^^^^^^^

 

Changed the coolant sensor and has started every single time , thanks for the help, on another note where does the rear back door get its single from showing open and close even when it's closed, thanks

 

Here's a pretty good article explaining the door open sensors. You may want to pop your door panel off to get to the switch/sensor and clean it. If this isn't it maybe try starting a new thread to more people to chime in.

https://repairpal.com/door-ajar-warning-light