We recently had a customer come in with a 2019 Mercedes Benz GLC 300 that was overheating. The customer told us that it was taken to a different shop where they diagnosed the Mercedes Benz GLC and concluded that the cooling fan was faulty. They proceeded to replace it but the car continued to overheat.
So the customer brought it to us for a second opinion. We started our diagnosis, by scanning the car and saw that there we communication and short circuit codes related to the engine cooling system. We the then suspected it was an electrical problem. We then proceeded to probe wires in the fuse box and found fuses 19 and 20 were not getting ground. We then pulled the shop manual with the wiring diagrams for the car and followed the wires related to the blown fuses. The wires lead to a connector under the driver’s seat.
We removed the trim and carpet in that area to inspect the wires and we found that there was a standing pool of water in the area. Somehow water was getting into the inside of the car and had pooled up in an area where the water caused connectors and short and burn wires. This is when we confirmed that the previous shop misdiagnosed the issue as the cooling fan was perfectly fine. Now to properly fix the problem we need to fix the water intrusion into the cabin and we have to replace the damaged wires and replace the blown fuses.
Once the repairs were done the 2019 Mercedes Benz GLC 300’s cooling system worked good as new! So if you have a European, Asian, or Domestic vehicles in need of diagnosis, repair, or maintenance feel free to reach out to us @ Tolima’s Auto Center!
