Why does my Suzuki Mehran engine overheat frequently in city traffic?

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Why does my Suzuki Mehran engine overheat frequently in city traffic?

I own a 2017 Suzuki Mehran, and I’ve been facing a recurring issue with engine overheating, especially during traffic jams in cities like Karachi and Lahore. The temperature needle rises above normal after about 20–30 minutes in slow traffic. I’ve already checked the coolant level, which seems fine, and there are no visible leaks. What are the most common causes of this issue in Mehran models, and what should I inspect o r replace first?

Gari Specialist asked on 30 May 2025 17:19:37 pm

1 Answer

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Gari Master - on 30 May 2025 17:21:15 pm

Frequent overheating in a Suzuki Mehran, especially in city traffic, is a well-known issue due to several design limitations of the cars cooling system. Here are the most common causes and recommended actions:

🔧 Common Causes:
Weak Radiator o r Blockage:
The radiator might be partially choked with rust o r dirt, common in older Mehrans. Even if coolant levels are fine, poor flow can cause overheating.

Fan Issues Non-Auto Models:
Many Mehrans use a direct non-thermostat-controlled radiator fan, which sometimes doesnt engage properly o r slows down over time. If you’re using an automatic fan setup, it might not be turning on at the correct temperature.

Old o r Faulty Thermostat Valve:
A malfunctioning thermostat might not open fully, restricting coolant flow.

Water Pump Water Body Wear:
A worn-out water pump fails to circulate coolant effectively, especially at low RPMs.

Low-Quality o r Incorrect Coolant:
Some users use plain water o r poor-quality coolant. This reduces the cooling systems efficiency and can lead to rust build-up.

✅ What You Should Do:
Get the radiator cleaned o r pressure-flushed professionally.

Inspect o r replace the thermostat valve or consider removing it temporarily in hot summers.

Make sure the fan motor is running at full speed and kicks in at the right temperature if automatic.

Inspect o r replace the water pump.

Always use a good-quality coolant not just plain water.

Check engine head gasket condition if the problem persists, as prolonged overheating may damage it.