I only used my air chisel at an angle on the nut flat.One or 2 burps and it loose.Then just spin it off by hand.Its a regular thread so it left loose.Remove the AC compressor if its like a Dodge.Makes it easy to remove the stat if you chage it.The pipe off the pump can be tough to remove sometimes.The hose from the intake can be a bear to get to the clamp sometimes also.Rocky