if thermostat is installed backwards what damage can it cause, would heater work
While it is a little difficult to install the Thermostat "backwards", the Thermostat typically would open "IF" there were sufficient Coolant, but would open late
The Heater (heater core) would still circulate "when" the Coolant moved "IF" the Thermostat opened
If the Heater (heat) is the main concern, the Heater Core could be clogged & need flushed (50/50 chance of clearing) or Replaced, or it can be the Air Door not closing to allow Heat
Checking "both" Heater Hoses for equal heat, after the engine has reached Operating Temperature, will let you know if the Heater Core is clogged
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