Mercedes Coupes/Sedans/Wagons 1974-1984 Repair Guide

Radiator

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REMOVAL & INSTALLATION All Models



See Figures 1 through 11

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Fig. Fig. 1: To remove the radiator, position a drain pan, then open the drain plug on the bottom of the radiator



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Fig. Fig. 2: Use a wrench to loosen the transmission coolant line nut ...



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Fig. Fig. 3: ... then disconnect the line from the radiator



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Fig. Fig. 4: Loosen the radiator hose clamp screws ...



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Fig. Fig. 5: ... then slide back the clamps and detach the hoses from the radiator



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Fig. Fig. 6: Loosen the nut retaining the oil cooler line to the radiator ...



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Fig. Fig. 7: ... then disengage the oil cooler line from the radiator and drain the oil into an approved container



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Fig. Fig. 8: Use a pair of pliers to remove the fan shroud retaining clips ...



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Fig. Fig. 9: ... then remove the fan shroud from the engine compartment



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Fig. Fig. 10: Remove the radiator retaining clips ...



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Fig. Fig. 11: ... then remove the radiator from the vehicle

  1. Remove the radiator cap.
  2.  
  3. Unscrew the radiator drain plug and drain the coolant from the radiator. If all of the coolant in the system is to be drained, move the heater controls to "warm" and open the draincocks on the engine block.
  4.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. If the car is equipped with an oil cooler, drain the oil from the cooler.
  2.  
  3. If equipped, loosen the radiator shell.
  4.  
  5. Loosen the hose clips on the top and bottom radiator hoses and remove the hoses from the connections on the radiator.
  6.  
  7. Unscrew and plug the bottom line on the oil cooler.
  8.  
  9. If the car is equipped with an automatic transmission, unscrew and plug the lines on the transmission oil cooler.
  10.  
  11. Disconnect the right-hand and left-hand rubber loops and pull the radiator up and out of the body. On 450 SL and SLC models, push the retaining springs toward the fenders to remove the radiator from the shell.
  12.  

To install:
  1. Inspect and replace any hoses which have become hardened or spongy.
  2.  
  3. Install the radiator shell and radiator (if the shell was removed) from the top and connect the top and bottom hoses to the radiator.
  4.  
  5. Bolt the shell to the radiator.
  6.  
  7. Attach the rubber loops or position the retaining springs as applicable.
  8.  
  9. Position the hose clips on the top and bottom hoses.
  10.  
  11. Attach the lines to the oil cooler.
  12.  
  13. On cars with automatic transmissions, connect the lines to the transmission oil cooler.
  14.  
  15. Move the heater levers to the "warm" position and slowly add coolant, allowing air to escape.
  16.  
  17. Check the oil level and fill if necessary. Run the engine for about one minute at idle with the filler neck open.
  18.  
  19. Add coolant to the level specified in Chapter One. Install the radiator cap and turn it until it seats in the second notch. Run the engine and check for leaks.
  20.  

 
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