Draining Coolant

NOTIFICATION 

Cooling circuit not filled correctly 

• Risk of damage to vehicle components 
  1. → After relieving the system pressure, do not start the engine or high-voltage system.
  2. → Fill and bleed the cooling system correctly before starting the engine or high-voltage system.

Information 

• Cooling systems with thermal management (controlled thermostats or coolant valves for controlling engine temperature) must be vacuum-filled. 
• The thermostat must not be activated or electric current must not be applied to the thermostat since this can cause irreparable damage to the thermoelectric couple. 
• Filling with a watering can only does not always guarantee a complete fill (trapped air - overheating). 
• Clamps on cooling system components should be examined carefully following refilling (check the coolant level while cold and top up several times as required). 
• Clamps on cooling system components must also be vacuum-filled if significant amounts of coolant are drained. Drain at least two litres of coolant for vacuum-filling because otherwise the correct vacuum cannot be built up. 

Information 

• Note special features in the corresponding chapter for vehicles with auxiliary heater. 

1. Slowly open cap on coolant reservoir -1-  .

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   Coolant reservoir cap

2. Place drip pan under the radiator.
3. Remove lower cap -1-  on the radiator -3-  .

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   Lower cap on radiator

   1. 3.1  Lift up spring clamp -2-  in order to loosen the locking mechanism.
   2. 3.2  Pull lower cap -1-  off the radiator -3-  .
4. Drain coolant.