Mercedes GLS Coolant Leak Repair in Hyderabad | GarageNation

Is your Mercedes GLS showing signs of coolant leak? GarageNation specialises in diagnosing and repairing this problem on the Mercedes GLS (SUV, Petrol) in Hyderabad. Urgency: Immediate. This is an immediate concern — do not continue driving until diagnosed. Estimated repair cost: ₹3,500 – ₹75,000.

Symptoms of Coolant Leak in Mercedes GLS

• Sweet smell from engine bay (ethylene glycol odour)
• Puddle of green, blue, pink, or orange liquid under car
• Temperature gauge climbing higher than normal
• Coolant reservoir level dropping repeatedly
• White sweet-smelling exhaust smoke (head gasket breach into combustion)

Why Mercedes GLS Is Prone to Coolant Leak

The Mercedes GLS uses a 3.0 M256 inline-6 EQ Boost (367 bhp GLS450) and is classified as a suv. Based on our workshop experience with Mercedes GLS in Hyderabad: AIRMATIC air suspension compressor failure — common at 60,000 km. Mercedes GLS models are among the brands we see most frequently for coolant leak repairs.

Top Causes of Coolant Leak in Mercedes GLS

• Radiator hose split or collar seal failure — most common cause
• Water pump seal or gasket leak — weeping from pump housing
• Radiator core leak from stress cracks or corrosion
• Head gasket failure — allows coolant into combustion chamber
• EGR cooler crack (Volvo, BMW diesel) — coolant leaks into exhaust system

How We Diagnose Coolant Leak on Mercedes GLS

• Coolant system pressure test at 1.4 bar — holds pressure if no external leak
• Combustion gas test — checks for head gasket breach into cooling system
• Infrared thermal scan of radiator and hoses for cold spots indicating blockage
• Water pump weep hole inspection and visual scan of all hose clamps

Prevention

Replace coolant every 5 years or 80,000 km — old coolant becomes acidic and corrodes aluminium components.

Frequently Asked Questions