The RV-Dreamers had to replace their 8 year old Fridge cooling unit with a "amish" one just last week.
The expert RV Refrigeration shop owner indicated slideout Fridges with sidewall venting fail a little more often than Fridges with roof vents, theoretically due to not quite as effective heat venting.
They got two fans in their repair.
When I replaced my Dometic with a Whirlpool apt size residential fridge I tested the old fan thermistor and it worked and re-installed it and the fan behind my residential fridge. Have NEVER heard that fan run.