What are the common causes of thermostat failure in heavy vehicles used in Pakistan’s transport sector?

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What are the common causes of thermostat failure in heavy vehicles used in Pakistan’s transport sector?

Heavy trucks, buses, and construction vehicles in Pakistan often suffer thermostat failure due to poor-quality coolant, lack of maintenance, and continuous heavy loading. Dust, rust, and impurities in cooling systems also cause thermostat valves to jam. This not only damages the engine but also increases fuel consumption and emissions. What preventive maintenance practices can transport operators adopt to reduce thermostat-related breakdowns?

Talha Kyanii asked on 23 Oct 2025 16:38:08 pm

1 Answer

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Gari Master - on 23 Oct 2025 16:40:53 pm

In Pakistan’s heavy transport sector, thermostat failures are often caused by poor maintenance, use of contaminated coolant, and low-quality spare parts. Heavy vehicles like buses and trucks run for long hours and carry heavy loads, causing their engines to operate under extreme heat. When thermostats o r cooling systems are not properly maintained, they develop rust, scale, and deposits that block the valve, preventing it from opening o r closing correctly.

To minimize failures, operators should flush the cooling system regularly, use manufacturer-recommended coolant, and inspect thermostats during routine maintenance. Using original o r high-grade replacement parts also ensures longer lifespan and better temperature control, preventing costly breakdowns and reducing emissions from inefficient engines.