If you feel the heater isn’t working well, that is the easiest way to tell the thermostat is stuck open. It can be challenging to tell this in a vehicle that doesn’t have a temperature gauge. ECT Sensor/ Wiring- If the thermostat itself isn’t the problem, it’ll be the wiring/sensor associated with Engine Coolant Temperature Sensor (ECT).Īn excellent way to tell if it’s a sensor issue or an issue with the thermostat is whether or not the Jeep Wrangler’s engine is running at its proper operating temperature. ![]() When this happens, the engine is “over-cooled” and never reaches the proper operating temperature. When a thermostat is stuck open, it allows coolant to flow through the engine at all times.
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