New Procedures Announced for Two GM ModelsThe procedure for replacing the upper tie bar on the chevrolet hhr has recently been updated, and it closely matches the procedural changes announced last year for the cobalt. in both cases, the manufacturer suggests some different welding techniques designed to apply less heat to milder steel components, and they both suggest the use of some different equipment. below, you'll find an in-depth look at the new welding and repair procedures for the hhr, as well as a quick reminder about the new equipment needs for the cobalt.