What is the intermittent thumping or drumming sound coming from engine.
I had the t-stat on my 2009 Ford Ranger replaced at the dealer and a few days later I started getting a intermittent single thump or drum sound at idle. I cannot determine the exact location. It happens about every 2 or 3 minutes. Any suggestions? Thanks. Mike
remove serpentine belt and see if noise goes away...maybe they let something loose when doing the job