I know someone who had a guitar come unglued in the boot of a car in England - Broadstairs or Sidmouth I believe. So for Texas in July, I would expect a potential problem and recommend at the very least taking all string tension off. It'll likely be the hide glue that suffers - I would not expect delamination because the glue between the laminations is different - and if all tension is off even if the hide glue softens it ought not to pull apart. It might be worth putting a soft strap round the body (all round the perimeter) in case the sides tend to spring at the neck and tail, although I would expect them to be well set by now. Entering the realms of paranoia, having taken string tension off, it might be good to take truss rod tension off too.

If you have a Garrison, put it in the car - the fibreglass frame and the wood bits may be differentially stressed by the heat. I have seen one crack its sides simply due to drying out.