Just for information.
Fans are t-stat controlled
T-stat is attached to far right fin of 'condenser' (section of fins at top of fridge)
T-stat Closes (turns fan(s) On) at 130*F Condenser Fin Temp
T-stat Opens (turns fan(s) Off) at 115*F condenser Fin Temp
Doesn't matter WHICH heat source is being used..electric or propane .
Both heat sources are adequate to turn the ammonia from a liquid into a vapor (propane is only 18*F hotter then electric heat element....electric transfers its heat via direct contact with perk tube while propane heat is transferred via a spiral baffle in flue so amount of heat to 'boil' the ammonia is virtually the same)
Proper airflow thru fins of condenser causes the vapor to condense into cold liquid ammonia---fans provide added airflow when temps are high.
More airflow thru condenser fins the more vapor to liquid the more cooling can be achieved
Depending on 'access' you maybe able to reach t-stat from roof vent ----pull wires/bypass t-stat and see if fans come on......direct wiring.
If t-stat bad...replace OR leave bypassed and install a on/off toggle switch in DC POS to fans down in the lower access...then manually run fans
If replacing t-stat......find a snap disc t-stat with LOWER temp settings.
(On at 100*F fin temp and Off at 85*F fin temp)
https://www.amazon.com/Thermostat-Sw...9B2WKXYY4TWZK7