How a Defective Electronic Thermostat Can Cause Problems for Your MINI

Author: Peak Auto

The cooling system is perhaps the most crucial component of your MINI since it regulates the temperature at which the engine runs. Among the parts that make up the cooling system is the electronic thermostat.

If the electronic thermostat fails then it might not properly regulate the coolant. This means that the engine will be running either too hot or too cold.

What Is the Purpose of an Electronic Thermostat?

The purpose of the thermostat is to regulate the flow of coolant from the engine into the radiator. At low engine temperatures the purpose of the thermostat is to ensure that the coolant stays in the engine for the proper functioning of the engine. After reaching the correct temperature the thermostat opens and allows coolant to flow into the radiator.

Electronic control of the thermostat in most MINI models makes the thermostat capable of working together with the engine management system which adjusts coolant temperature by considering engine load, driving conditions and other operating temperatures. Failure of the thermostat will make this procedure ineffective and making it impossible to achieve the right engine temperature.

Engine Overheating

Another major problem caused by malfunctioning electronic thermostats is engine overheating. If the thermostat remains closed when it is supposed to be open then there might be a restriction of coolant flow in the radiator.

The increase in engine temperature will be followed by warning messages on the dashboard. If overheating is left to progress then the engine can get damaged.

The parts of the engine that can be affected by overheating include:

  • Cylinder head
  • Head gasket
  • Engine seals
  • Pistons
  • Cooling system components

Check Engine Light or Other Warning Messages

A faulty electronic thermostat may cause a Check Engine Light to come on. The engine control system tracks coolant temperature and certain operating parameters. In case of an abnormal reading of the thermostat or coolant temperature, a fault code may be stored in the system. In addition, you could notice a warning message associated with engine temperature or the cooling system operation.

Diagnosis of the system with a scan tool can reveal any stored faults. However, not all stored codes mean that there is an issue with the thermostat.

Poor Fuel Efficiency

The engine requires working at a particular temperature range. Any malfunction of the thermostat causing low engine temperature or temperature fluctuations may result in decreased fuel economy. You may notice that your car is consuming more fuel than before without any changes in your driving style.

Poor fuel economy may have numerous reasons such as tire pressure, fuel system failure, ignition system problems, sensors and engine performance. But if there are signs of increased fuel consumption in combination with temperature problems then you need to pay attention to the thermostat and coolant system.

Engine Power Loss

Another issue that may be caused by a failed thermostat is engine power loss. If your engine does not reach the required temperature then the engine management control unit will make some adjustments to engine performance. It will affect throttle response, fuel consumption and overall engine performance.

Symptoms:

  • Decreased acceleration
  • Poor throttle response
  • Engine operation instability
  • Poor fuel economy
  • Longer warm-up period

Poor Cabin Heat

A bad electronic thermostat could cause poor cabin heat. Your MINI uses the heat from engine coolant to heat up the cabin of your car. An insufficiently heated engine due to a constantly open thermostat will result in poor cabin heating.

Another thing that could cause inconsistent cabin heat is low coolant, a restricted heater core, air in the cooling system or a malfunctioning heater control. A thorough inspection is needed to determine the exact cause.

Electronic Thermostat Diagnosis

Professional diagnosis is always the most effective way to determine whether or not the electronic thermostat is actually defective. The technician will perform an inspection of the cooling system and compare coolant temperatures.

It could include:

  • Diagnostic trouble code scan of the MINI
  • Checking coolant temperatures
  • Thermostat housing inspection
  • Checking the coolant level and condition
  • Electrical circuit checks
  • Coolant leaks check
  • Radiator inspection

Conclusion

Do not ignore any signs of strange temperature levels, recurrent warnings, insufficient cabin heating or any other indications that there is something wrong with your cooling system. Timely diagnosis will allow you to fix a minor problem with your electronic thermostat and avoid major repairs to your engine.

To conduct a reliable inspection and diagnosis of the electronic thermostat of your MINI as well as make necessary repairs to the system then come to our experienced automobile service center. We will be able to diagnose your car and propose the most suitable repair to maintain the correct temperature of your engine.