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Pelican Technical Article:

Coolant Expansion Tank Replacement

Mike Holloway

Time:

30 minutes30 mins

Tab:

$130

Talent:

*

Tools:

Flat head screwdriver, 8mm Nut driver

Applicable Models:

Mercedes-Benz R107 (1972-89)

Parts Required:

New coolant expansion tank

Hot Tip:

Allow engine to cool, cutting off old hoses optional

Performance Gain:

Reduced hose failure, proper engine temperature

Complementary Modification:

Other Hose Replacement
Over time, the coolant expansion tank tends to turn yellow, become brittle and form micro fractures and sometimes leak. When the car warms up, both the heat and pressure of the coolant starts to attack the weakest point of the tank, eventually causing it to fail and the car starts leaking coolant. The good news is that the replacement tank is relatively inexpensive and can be changed in less than an hour.

Take a look around the coolant tank. In some instances, you can instantly see it has been leaking. In others, you may only see a faint trace of coolant weeping/staining the crack or seam. It's important to tackle this problem as soon as possible. 

You do not need to drain all the coolant from the vehicle just drain enough so that it is below the coolant reservoir. If the coolant in the car is new there is no reason to replace it as long as you drain it into a clean container. Coolant is expensive and not great for the environment so if the coolant in your car is good, try and save it to reuse.

Allow cooling system to cool down to a coolant temperature of less than 90 degrees C. Open cap of 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. You might want to wait overnight to make sure that the coolant is not hot. If you open the coolant tank with the car warmed up, it could burn you. There is heat and pressure in the system. You might want to wait overnight to make sure that the coolant is not hot. If you open the coolant tank with the car warmed up, it could burn you. There is heat and pressure in the system.

There are markings on the side of the reservoir for the fluid level. Make sure to check with your owner's manual on the type of coolant used in your vehicle and do not mix them. Installation is the reverse of removal and don't forget to top up the reservoir.

The coolant expansion tank is located to the right side of the car.
Figure 1

The coolant expansion tank is located to the right side of the car. It is located behind the washer fluid tank (red arrow).

There may be coolant in the expansion tank.
Figure 2

There may be coolant in the expansion tank. There are different tools you can use to remove the majority of the fluid prior to removing the tank such as a turkey baster or a hand-held fluid pump. A hand held pump is used in thePicture. The suction tube is placed into the tank and the outlet tube drains into a bucket to collect the fluid.

Loosen the hose clamp connecting the tank to the radiator and remove the hose from the tank.
Figure 3

Loosen the hose clamp connecting the tank to the radiator and remove the hose from the tank. There may be coolant in the tank. Place a collection bucket under the car to catch any coolant that may leak out.

Remove the hose from the expansion tank.
Figure 4

Remove the hose from the expansion tank.

Remove rear 8mm mounting bolt from tank.
Figure 5

Remove rear 8mm mounting bolt from tank.

Remove front 8mm mounting bolt for tank.
Figure 6

Remove front 8mm mounting bolt for tank.

Unscrew hose clamp below the tank using a flat head screw driver.
Figure 7

Unscrew hose clamp below the tank using a flat head screw driver. The tank and hose located beneath the tank may contain coolant. It is important that you tip the tank up as to not allow the coolant to spill into your engine compartment. Dispose of coolant appropriately.

The tank is now free from the car and can be replaced.
Figure 8

The tank is now free from the car and can be replaced. Installation is the reverse of removal.

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Page last updated: Mon 12/5/2016 02:24:47 AM