2002 Volvo S40 • 4 cylinder Turbo 2WD Automatic • 85,500 miles

When driving my car with the a/c on for awhile And when I turn off the engine my car won't star up. I need to let it sit for about 30 to 45 mints and than the car will star up, I have taken my car to many mechanics that specialist in foreign vehicles but have not been able to resolve the problem. The engine has been replaced, gas pump, alternator, ignition
March 7, 2014.

When the car fails to start, does it crank but not start, or do nothing at all? Does it only do it when the a/c runs or anytime the car is driven?