11/08/2026
π§ Mercedes-Benz GLC β When a Coolant Leak Becomes More Than Just a Radiator Repair π§
Another interesting job completed here at WH Autos β Mercedes-Benz Specialists.
Our customer came to us with a Mercedes-Benz GLC that had been suffering from ongoing coolant loss. The vehicle was regularly requiring coolant to be topped up, so it had previously been inspected by a local mechanic.
The initial inspection identified a leaking radiator. Due to the size and complexity of the repair, the previous garage wasnβt confident taking the job on and a cooling-system sealing product was recommended as an alternative.
Following this, the customer began experiencing further problems, including the engine management warning light and coolant warning light appearing on the vehicle.
This is where a proper investigation was required. π
When the vehicle arrived at WH Autos, we carried out our own inspection and assessed the condition of the cooling system.
We advised the customer that simply replacing the radiator would not be enough. After a sealing product has been introduced into a cooling system, we recommended that the system be thoroughly flushed and cleaned before installing the replacement components.
We proceeded with:
π§ Complete cooling system flush
π§ Removal and replacement of the radiator
π§ Thermostat replacement
π§ Cooling system refill and bleeding
π§ Cooling system checks
π§ Mercedes-Benz specialist diagnostic checks
π§ Final inspection and road test
The radiator and thermostat were replaced using genuine Mercedes-Benz parts.
β οΈ Why is cooling-system contamination important?
Cooling systems are made up of numerous components, including radiators, thermostats, coolant hoses, water pumps and small coolant passages. Products designed to seal leaks can potentially circulate through the system and leave deposits or restrictions.
Thatβs why, when a vehicle has had a sealing product introduced into the cooling system, we believe itβs important to flush the system correctly and inspect the vehicle thoroughly, rather than simply replacing the failed component and sending the vehicle back out.
A cooling system that isnβt operating correctly can lead to overheating and potentially very expensive engine damage, so coolant loss should never be ignored.
The repair is now complete, the vehicle has been checked and road tested, and our customer is back on the road with confidence. ππ¨
At WH Autos, we donβt just replace parts β we investigate the cause of the problem and make sure the repair is carried out correctly.
π WH Autos β Mercedes-Benz Specialists
Rear 426 Upper Elmers End Road
Beckenham
BR3 3HQ
π 07908 945215
π WHAutos.co.uk
Mercedes-Benz Specialist | Diagnostics | Servicing | Repairs