Mercedes CLS Coolant Leak Repair in Hyderabad | GarageNation

Is your Mercedes CLS showing signs of coolant leak? GarageNation specialises in diagnosing and repairing this problem on the Mercedes CLS (Coupe, 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 CLS

• 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 CLS Is Prone to Coolant Leak

The Mercedes CLS uses a 2.0 M264 petrol EQ Boost (258 bhp CLS300) and is classified as a coupe. Based on our workshop experience with Mercedes CLS in Hyderabad: M264 timing chain tensioner fault at 60,000 km. Mercedes CLS models are among the brands we see most frequently for coolant leak repairs.

Top Causes of Coolant Leak in Mercedes CLS

• 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 CLS

• 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