As an auto tech of 11 years I wanna say . I pretty much never see stuck closed thermostats . Must have fixed hundreds of overheat issues and never seen but like 2 or 3 stuck closed thermostats . Proabbly seen 2 or 3 dozen stuck open thermostats causing under heat conditions. I replace engines, head gaskets , trans mission assemblies and my current job I’m in this week is studding a 6.0 powerstroke diesel and replacing head hadkets (23 hours repair) . When someone hollers theromast the second they hear a vehicle overheated , really tells me the guy eats paint chips and knows nothing of diagnostics.
As an auto tech of 11 years I wanna say . I pretty much never see stuck closed thermostats . Must have fixed hundreds of overheat issues and never seen but like 2 or 3 stuck closed thermostats . Proabbly seen 2 or 3 dozen stuck open thermostats causing under heat conditions. I replace engines, head gaskets , trans mission assemblies and my current job I’m in this week is studding a 6.0 powerstroke diesel and replacing head hadkets (23 hours repair) . When someone hollers theromast the second they hear a vehicle overheated , really tells me the guy eats paint chips and knows nothing of diagnostics.