Help with Supermarket Shopping Cart Theft Deterrent Systems?

Jimmy asked: The electronic locking wheel solution is an effective way to stop shopping cart loss or theft. The system works by embedding a thin wire under the concrete surface of the perimeter of the parking lot. The wheel automatically locks when it is pushed beyond the invisible barrier. The electronic wheel locking system is [...]

I just purchased a golf cart that had ac, the fellow told me it was R12.please help?

Master Tech asked: I took it to a shop and they said it was converted to R134. I am confused can you put r134 into an r12 system, I heard you can get autozone to run a scan on it for free.Those guys I heard are awesome diagnosticians. They told me I can buy a [...]