My first thought you say when it is hot outside it will not even crank or do anything. I assume you do nothing and it will crank when it is cold. Well if that is the case I am thinking it may be a loose connection. Metal will expand in heat and contract in cold. My crazy thought is a connection is tight in cold and loose in heat. In heat try moving the battery, ground, solenoid connections if loose tighten them up.
If the car does try to crank
IAT sensor may have something to do with it(intake air temperature) link below
https://www.youtube.com/watch?v=NVIRlpTj-Gk
If check engine light is on have codes checked. Most auto part store where I live will check codes for free.
SOURCE: Hard starting hot or cold. Battery and starter are fine.
check fuel pump relay/should run pump for two sec when key is turned on. try turning key on but dont crank did pump hum/if it did look towards leaky fuel inj./faulty pressure reg. poss clogged fuel filt.
SOURCE: I have a 2005 dodge neon won't start
have checked the starter, if it clicks, but no crank, that is a starter, if cranks, but does not turn on, that could be a bad battery. ( assuming you have gas )
SOURCE: Dodge Neon 2005) Car will not start.
I was having the same exact problem with my 2005 neon as well. The guy at Discount auto suggested the starter itself was the problem(cost approx $200). The car isn't old enough to be having a starter issue so I figured it was something more simplilar. My dad took a look and founf out it was the starter relay. It is located in the black fuse/relay box on the driver's side right next to the battery. I had to get a new relay at the dealership(cost $20) and my car starts perfectly. Hope this helps
SOURCE: my 2005 yukon is blowing cold ar on one side and
you have a motor sticking and I do not eveny you taking it apart if you want directions to do this let me know and I can give you directions but it is a lot of work.
Testimonial: "yes i took it to the dealer and came back with the dr. side airdoor actuator had a bad ground and pass.side recycling actuator was bad"
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