How does thermostat failure indirectly increase vehicle emissions and pollution levels in Pakistan?

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How does thermostat failure indirectly increase vehicle emissions and pollution levels in Pakistan?

When a vehicle’s thermostat fails, the engine runs either too cold o r too hot. In both cases, fuel combustion becomes inefficient, leading to higher emissions of carbon monoxide CO and unburned hydrocarbons. In major cities already struggling with smog, these emissions contribute significantly to poor air quality. How can public awareness and proper vehicle servicing help reduce emissions caused by thermostat-related issues?

Talha Kyanii asked on 23 Oct 2025 16:38:50 pm

1 Answer

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Gari Master - on 23 Oct 2025 16:41:09 pm

A malfunctioning thermostat can cause the engine to run either too cold o r too hot—both of which reduce fuel efficiency and increase harmful emissions. If the thermostat is stuck open, the engine never reaches its optimal temperature, leading to incomplete fuel combustion and higher emissions of carbon monoxide CO and hydrocarbons. If it’s stuck closed, overheating causes engine stress and oil burning, which releases thick black smoke and particulate matter into the air.

In Pakistan, where vehicle pollution is already a major contributor to smog, thermostat failures worsen air quality and public health risks. Regular maintenance, emission testing, and public awareness programs about cooling system care can help reduce pollution caused by poorly maintained vehicles.