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Coolant Flush and Replacement
 
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Pelican Technical Article:

Coolant Flush and Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$25 to $45

Talent:

**

Tools:

Pliers, 6mm Allen, large bucket, floor jack, jack stands, wheel chocks, safety glasses

Applicable Models:

Mercedes-Benz C350 (2008-15)
Mercedes-Benz GLK350 (2010-15)

Parts Required:

New coolant

Hot Tip:

Get a really big bucket

Performance Gain:

Proper cooling

Complementary Modification:

New hoses

If you are changing your coolant this is also the perfect time to give your cooling system a complete flush. While it is next to impossible to get all of the coolant and contaminants out of the system without removing the heater core lines and blowing out the heating system this method will get the system as clean as possible and more than good enough for the next ten years.

A couple of safety precautions/instructions you may want to observe before beginning:

Allow the cooling system to cool down to a coolant temperature of less than 80°C. Open the cap of the cooling system slowly; turn a conventional coolant cap as far as the first detent and turn a screwed coolant cap approx. 1/2 turn and release the pressure. Wear protective gloves, protective clothing and eye protection. NEVER pour coolant into beverage bottles, cups, etc.. Someone might accidentally pick that cup up and start to drink. Always dispose of your used coolant correctly and in accordance with your local regulations. Never pour it down a drain or in the ground.

If you are going to drain the coolant from the block you are going to be working around the starter motor, as the block drain plug is located right beside the starter. I highly, highly recommend you disconnect the battery, as the chance of harming yourself and the vehicle is greatly increased once everything is wet with coolant.

Begin by safely jacking up and supporting your car.

The coolant reservoir is located on the right side of the motor beside the right side air duct (red arrow).
Figure 1

The coolant reservoir is located on the right side of the motor beside the right side air duct (red arrow).

Let the engine cool completely before beginning this job.
Figure 2

Let the engine cool completely before beginning this job. Once everything is cool slowly open the reservoir cap to release the pressure. With the cap off the coolant will drain quicker.

The radiator drain plug is located on the lower left side of the radiator at the front of the vehicle (red arrow).
Figure 3

The radiator drain plug is located on the lower left side of the radiator at the front of the vehicle (red arrow). You will need to remove the under engine tray to access it. If you need help removing the tray please see our article on under body tray removal for additional assistance.

Attach a hose to the drain spigot (red arrow) and use a set of pliers to turn the drain knob (yellow arrow).
Figure 4

Attach a hose to the drain spigot (red arrow) and use a set of pliers to turn the drain knob (yellow arrow).

The drain knob is made from plastic as is the drain assembly and cannot be replaced without replacing the entire radiator (red arrow), so use care when working with it.
Figure 5

The drain knob is made from plastic as is the drain assembly and cannot be replaced without replacing the entire radiator (red arrow), so use care when working with it. Our drain knob needed to be turned 90 degrees counter clockwise and then pulled out to get the fluid to drain. There have been several versions of these radiators over the years so be prepared to improvise if yours is different than our project car.

The engine block drain plug is located on the right side of the motor just above the starter (red arrow).
Figure 6

The engine block drain plug is located on the right side of the motor just above the starter (red arrow).

The 6mm Allen bolt (red arrow) is very close to the starter so it is a really, really good idea to disconnect the battery first.
Figure 7

The 6mm Allen bolt (red arrow) is very close to the starter so it is a really, really good idea to disconnect the battery first. Please see our battery article for additional information. The leads on the starter should be covered but I strongly recommend disconnecting the battery especially since everything will be wet with coolant once it is drained. To flush the system: close all the openings and fill the reservoir with distilled water. Run the motor with the heater on full for a few minutes. Then drain and repeat until the water runs out clear. To fill and vent the system: the best way is to rent or borrow a coolant system pressure tester; this will allow you to fill, pressurize and vent the system all at one time. If you do not have a pressure tester you can still fill and vent the system, but it is important to get all of the air out of the system or the engine will run hot. Note: If you have completely drained the cooling system (using the drain plug on the side of the block) you may want to disconnect the upper radiator hose (at the radiator), hold it up in the air, and fill the block by pouring coolant into the hose. Do not fill the coolant hose completely, as it will make a mess when you reconnect it back to the radiator. Reconnect the upper radiator hose and fill the reservoir, start the motor with the cap off and allow the motor to run for a few minutes but do not let it get hot. Turn the motor off and add coolant as needed. Do this a few times, and you should be good to go. Make sure to check the reservoir and top it up as needed, as the last of the air makes its way out of the system.

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Comments and Suggestions:
James j. Morrison Comments: How many gallons of antifreeze does the Mercedes Ben

HOW many gallons of antifreeze should I purchase after draining and FLUSHING THE COOLING SYSTEM ON 2012 MERCEDES-BENZ C250 SL 4 DOOR SEDAN WITH THE W204 FOUR CYLINDER TURBOCHARGED INGAIN?



September 28, 2016
  Followup from the Pelican Staff: 8.0 liters - Nick at Pelican Parts  
James j. Morrison Comments: How many gallons of antifreeze does the w204 four cylinder turbocharged ingain hold after flushing it out?
September 28, 2016
  Followup from the Pelican Staff: 8.0 liters - Nick at Pelican Parts  

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