1999 Chevrolet Pickup Engine cooling Problems

“Hello,I've recently purchaced this vehicle used,and I've discovered it has engine bearing knock noice .I had it checked out at a dealership.from what I've read on this problem the engines were put together with the wrong size bearings.I feel this is a manufactures defect and the consumer should not have to be responsible for paying to have the problem fixed.thanks for your time and any responces. Steve cathcart.”

“When starting the vehicle engine makes a rattling noise, called cold engine knocking. Manufacturer stated no damage to the engine had been found due to this knocking. As stated in the service bulletin, this may occur when it's 50 degrees outside or if the vehicle haven't been started in several days. The noise may be caused by interaction of the piston and cylinder wall. Gm powertrain engineers confirmed the noise isn't detrimental to performance, reliability, or durability of the engine. It was also noted that replacing the engine wouldn't eliminate the noise.”