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GENERAL Learning Environment Category B (B, B1)

Question 879 of 1208

Frequent driving with the thermostat defective and, implicitly, with a coolant temperature below 60 degrees C leads to:

A an increase in fuel consumption;

B the impossibility of heating the cabin;

C the blocking of the water pump.

See explanation

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Explanation

For answer A

Frequent driving with the thermostat defective and with the coolant having a temperature below 60 degrees Celsius increases fuel consumption by up to 90%. The coolant temperature that ensures maximum performance, reduced fuel consumption and minimal engine wear is within the range of 90-95 degrees Celsius.

For answer B

Motor vehicles may have an air conditioning system that uses the air conditioning compressor to heat the cabin without using the coolant anymore. In addition, a temperature of 60 degrees Celsius is sufficient for heating the cabin.

For answer C

The water pump will not be affected if driving frequently with the thermostat defective, regardless of the coolant temperature.

The correct answer is: A

Recommendations:

Mechanics course (knowledge of the main elements) --> Mechanics course

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