PLA + Car + Sun = will never work
I developed a phone holder for my Nexus4 and printed it in PLA to test the basic functions. Worked quite well until the outside temperature was about 18°C. After 8 hours the PLA was a little bit twisted so that my phone does not fit anymore.
The last days the temperature was over 30°C. After 8 hours the phone holder was totally bend. It felt like hot cheese and I could deform it to different sculptures with only two fingers.
So, if you want to print something for your car, use ABS. That's what I will try to do next.
Nope, not that I know of. That's the nature of PLA, it is quite heat sensitive. It has a glass transition temperature of about 60-65C so it doesn't take much for it to start feeling the heat so to speak.
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