Holding at that low pressure indicates a balance spring issue. OEM radiator cap leaked down steadily to 5-6 psi over several tests. These pipes and hoses are readily accessible in the engine bay. Since the heater core is buried within the HVAC plenum behind the dash, the easiest check is the heater core inlet and outlet pipe temperatures. If the engine shows a normal operating temperature, and the heater is not blowing hot air, I troubleshoot the coolant flow through the heater core and the HVAC blend door control system. If there is an issue with the heater temperature or the engine’s operating temperature, it’s time to replace the thermostat. The cap and entire cooling system called for a pressure check.īefore draining the cooling system, I want to know the overall condition of the system. The cold coolant level in the overflow tank has been fluctuating slightly, which suggested that the radiator cap may not be holding its rated 16 psi pressure. The current thermostat opens at exactly 195 degrees F and holds this temperature at cruise speeds under normal load. To assure a safe boiling point, the thermostat and radiator cap must be in good condition. This system has been maintained properly and shows no signs of clogging.Ī cooling system’s pressure affects the boiling point of the coolant. Cold areas are a sign of clogging or restricted flow. The radiator core, tanks, heater inlet and outlet and other cooling system points get tested for coolant flow. Pressure testing, inspection, flushing and fresh coolant will keep the cooling system reliable and protected. A cooling system flush and coolant change were due. Recently, the engine has been running just a few degrees warmer while trailer pulling on grades. I watch the temperature gauge under all driving conditions. At the current mileage, the hoses and radiator are due for pressure testing. The thermostat has maintained normal opening and closing temperatures since. I changed the coolant and thermostat at the last water pump replacement. During the first drive belt change, the belt tensioner and idler pulley were replaced. I replace parts before they fail in service. Protecting the cooling system is always a concern. Fortunately, each water pump failure came with ample warning. Given the track record for Ram Cummins 6BT and ISB water pumps, two water pump replacements over the span of 185,000 miles is not unusual. The cooling system has always functioned reliably on the road. The Ram’s cooling system came due for thorough testing and a coolant change. Here, the cooling system gets checked for pressure and holds the 16 psi rating without dropping. Check these troubleshooting and repair guides for more help on your Mercedes-Benz.Periodic testing and routine coolant-antifreeze service will keep the engine, heater core and radiator in top condition. We hope you find the Drain Flush Mercedes-Benz Coolant Antifreeze guide helpful. If you want to flush the system thoroughly, you must also drain the coolant in the engine block. Mercedes engine also has an engine block drain located on the passenger side of the engine between the exhaust and engine mount.Do not work on the cooling system if the engine is still hot.Allow the engine to cool down and check the engine coolant level.Start the engine and let it reach operating temperature.Do not use tap water, as the chemicals found in drinking water can cause damage. If you mix coolant and water, ensure you use distilled water. Add the recommended Mercedes engine coolant from the coolant tank.Tighten the drain plug after all the coolant has drained.Allow the engine coolant to drain for about 10 minutes.On models such as the E-Class W210, the drain plug is red. 2008 Mercedes CLK550 Radiator Drain Plug” data-entity-type=”file” data-entity-uuid=”82cae205-d073-4996-8d65-52c59e0c32d8″> The drain plug is easy to identify. Unscrew the drain plug at the bottom of the radiator on the driver’s side. Place a drain bucket below the radiator on the driver’s side.You don’t need to remove the cover under the engine. It is held in place with several 8mm screws. Remove the undercover right behind the front bumper.Remove the cap to release cooling system pressure. Locate the coolant expansion tank in the engine bay. Pull the hood release under the dashboard and open the hood.Ensure the transmission is in the park and parking brakes are on. Park the vehicle and allow it to cool down.The recommended type is listed in your owner’s manual.įollow this procedure if you need to flush the Mercedes engine coolant or need to replace the radiator or water pump.
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