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Pelican Technical Article:

Radiator Replacement

Mike Holloway

Time:

1 hour1 hr

Tab:

$770

Talent:

*

Tools:

10mm socket and wrench, pliers, diagonals

Applicable Models:

Mercedes-Benz R107 (1972-89)

Parts Required:

New Radiator

Hot Tip:

Work on a cool car

Performance Gain:

Improved engine cooling

Complementary Modification:

Replace hoses
Mercedes-Benz radiators can and do fail. Unfortunately they tend to fail around the plastic couplings that join to the water hoses. The failure of the plastic coupling means you have to replace the entire radiator. This article will show you how to remove and replace your radiator. 

Make sure the car is cool before you begin working on it. Make sure the car has cooled down to room temperature. A couple of safety precautions and instructions you may want to observe before beginning. 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.

Locate the drain plug on the bottom of the lower front driver side of the radiator.
Figure 1

Locate the drain plug on the bottom of the lower front driver side of the radiator. Place your drain bucket under the hole and turn the knob. After coolant is drained from the radiator put the plug back. This will prevent losing it in case the radiator can be rebuilt.

The red arrow shows the engine block drain plug location on the right side of the engine.
Figure 3

The red arrow shows the engine block drain plug location on the right side of the engine.

The red arrow shows the engine block drain plug location on the left side of the engine.
Figure 4

The red arrow shows the engine block drain plug location on the left side of the engine.

Undo and separate the overflow hose.
Figure 5

Undo and separate the overflow hose.

Undo the upper hose from the radiator.
Figure 6

Undo the upper hose from the radiator.

Give yourself more room by simply lifting the charcoal canister on the left side of the radiator mount up and out of the way.
Figure 7

Give yourself more room by simply lifting the charcoal canister on the left side of the radiator mount up and out of the way.

Disconnect the transmission oil coolant line near the drain plug.
Figure 8

Disconnect the transmission oil coolant line near the drain plug. There will be some fluid that will spill so be prepared for it.

Disconnect the transmission oil coolant line on the left side of the radiator.
Figure 9

Disconnect the transmission oil coolant line on the left side of the radiator. There will be some fluid that will spill so be prepared for it.

Unscrew the radiator shroud and lift from its locating taps on the bottom of the radiator and move the shroud back over the fan.
Figure 10

Unscrew the radiator shroud and lift from its locating taps on the bottom of the radiator and move the shroud back over the fan. The shroud can rest on the fan blades.

Undo and remove the lower hose from the radiator.
Figure 11

Undo and remove the lower hose from the radiator.

The radiator is now free and can be lifted from the car.
Figure 12

The radiator is now free and can be lifted from the car. The radiator has two rubber mounts that sit on grommets in the lower cross frame. Sometimes you need to wiggle the radiator around to free it from the lower mounts, just take care that you do not damage it against the fan or condenser.

With the radiator gone the shroud can easily be removed from the engine bay.
Figure 13

With the radiator gone the shroud can easily be removed from the engine bay.

Inspect the radiator for signs of damage.
Figure 14

Inspect the radiator for signs of damage. In some cases the radiator can be repaired. The fins should not be bent and there should be no signs of corrosion or leaks. ThisPicture shows bent fins and signs of a leak and corrosion. Installation is the reverse of removal. Charge the system with new coolant. Be sure to use the type of coolant required for your car. The owner's manual should list the coolant required.

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Page last updated: Fri 1/20/2017 02:27:48 AM