Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
FSB_2014-108
HEATER VALVES MUST BE OPENED WHILE REAR HEATERS ARE RUNNING. FAILURE TO DO SO WILL RESULT IN FAILURE OF THE HEAT PUMP, VOIDING THE WARRANTY ON THE COMPONENTS. THIS PROCEDURE IS NOT NECESSARY IF YOU VEHICLE IS EQUIPPED WITH ELECTRIC OR VACUUM DRIVEN SHUT OFF VALVES.
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.