Is radiator leakage common in Suzuki Wagon R in summer heat?

Home > Gari Forums > Suzuki Forums > Suzuki Wagon R Forums > Suzuki Wagon R Radiator Leaks Forums

Is radiator leakage common in Suzuki Wagon R in summer heat?

Im driving a 2016 Suzuki Wagon R in Karachi, and now that its getting hot over 40°C, I noticed coolant dripping from the front of the car after turning off the engine. Upon checking, it seems to be coming from the radiator area. A local mechanic said it might be a crack in the plastic top of the radiator, which he claims is a common issue in Wagon R during summers in Pakistan. Is this true? What are the best options for repairing this—should I go for radiator sealant, plastic welding, o r a full radiator replacement?

Gari Specialist asked on 29 May 2025 14:02:16 pm

1 Answer

26 views |

Gari Master - on 29 May 2025 14:03:42 pm

Yes, radiator leakage in Suzuki Wagon R during the hot summer months especially in cities like Karachi, Lahore, and Multan is a well-known issue, particularly in models between 2014 and 2018. Heres what usually causes it:

1. Weak Plastic Radiator Top
The Suzuki Wagon R comes with a radiator that has a plastic top tank, which is known to develop cracks due to:

Prolonged engine heat.

Poor quality coolant o r lack of coolant maintenance.

High ambient temperatures during summer.

2. Pressure Build-up
The cooling system may over-pressurize if:

The radiator cap is faulty.

The thermostat is stuck closed.

The radiator fan isn’t working properly.
This pressure can force cracks in the radiator, especially in hot weather after engine shut-off.

3. Coolant Quality & Maintenance
In Pakistan, many people use tap water o r substandard coolants, which accelerate corrosion and plastic fatigue in the radiator.

Repair Options:
Radiator Sealant:

Temporary solution may work for very small leaks.

Not reliable for long-term o r large cracks.

Plastic Welding o r Epoxy:

Can work for hairline cracks if done properly.

May not hold long under high pressure/heat.

Radiator Replacement:

Best long-term solution.

You can choose between:

Genuine Suzuki radiator expensive but reliable

Good quality aftermarket radiator like Denso o r Korean brands.

Maintenance Tip:
Flush and replace coolant every 30,000–40,000 km using a high-quality coolant not just water.

Replace the radiator cap if its old o r shows signs of pressure loss.