Thank You for writing into AskPatty!! Typically if you are hearing "ticking" noises after the engine is off, you more then likely are experiencing engine and exaust components that heat up on a normal drive cooling and flexing. Heat will expand metal and when you turn off your engine you begin the cool down process which can cause some reverberation.
A. J. Valle
〉 Answered on Sep 2nd, 2011 by Amanda J. Pierce, MBA "AJ", Certified Mechanic, Project Coordinator; Primavera Scheduler at VIGOR Alaska Industrial Shipyard & BizzM3ch Solutions
Of course I am going to suggest you take it in to have it looked at! The good news is that it most likely is not a safety issue if there are no other symptoms. It may just be the heat shield that surrounds the exhaust system - under normal circumstances, the metal can sometimes make a ticking sound as it cools. Please have a technician check it out to make sure.
〉 Answered on Sep 2nd, 2011 by Judy Curry, Co-Founder and Vice President of Marketing at Currys Auto Service
Hi, the ticking is the engine cooling down or also referenced as heat dissipation. Longer drive times can amplify the "ticking".
〉 Answered on Sep 2nd, 2011 by Kerri Papajohn, Marketing Director at USA Sealants, Inc.