P0597 Mercury Thermostat Heater Control Circuit Open

Possible causes

– Failed Engine Cooling Thermostat
– Engine Cooling Thermostat harness is open or shorted
– Engine Cooling Thermostat circuit poor electrical connection

Tech description

If there are not coolant system leaks, replaced the thermostat to fix the problem.

What about the obd code?

The P0597 Mercury is triggered when there is an open or short thermostat heather control circuit.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)