Jim, in this weather I wouldn't leave a laptop in the car. Some bad stuff could happen to your liquid crystal or you could get some moisture inside the device. I wouldn't leave mine in the car if it is over 75 degrees either and sunny. Never leave them in direct sunlight for an extended period. The plastic casing can warp and you can again damage the LCD. When it is about 80-90 degrees out and you have your car all rolled up, you can get 100-115 degree temps in the car. (For wass, this is an estimate, not a thermometer measured, dead on number.)
Just saying that there is more to protecting your hardware than locking it up.
---------------------------------------------- Somewhere there is a village missing an idiot.