When a vehicle is in for a thermostat replacement, who is correct: Service Consultant A suggesting a complete coolant flush, or Service Consultant B suggesting a leak test?

When a vehicle comes in for a thermostat replacement, both performing a complete coolant flush and conducting a leak test are beneficial practices and are justifiably recommended.

A complete coolant flush is advisable because it helps remove any old, contaminated coolant and debris from the cooling system, which can improve overall system efficiency and prevent future overheating issues. Since the thermostat regulates engine temperature based on the coolant path, ensuring that the new thermostat is paired with fresh, clean coolant maximizes its effectiveness and longevity.

Additionally, a leak test is important as it helps identify if there are any leaks within the cooling system. If a thermostat is being replaced, there may have been underlying issues, such as the thermostat failing to open or close properly due to coolant contamination or system leaks. Performing a leak test can help avoid further issues down the line, ensuring that the entire cooling system is functioning properly after the repair.

In summary, both recommendations align with best practices for vehicle maintenance following a thermostat replacement, making both Service Consultant A and Service Consultant B correct in their suggestions.