Draining Coolant

Information 

• Vacuum-fill cooling systems with thermal management (controlled thermostats or coolant valves for controlling engine temperature). 
• The thermostat must not be activated or electric current must not be applied to the thermostat since this can cause irreparable damage to the thermocouple. 
• Filling with a watering can only does not always guarantee a complete fill. 
• 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 a vacuum cannot be built up. 

1. Carefully open the coolant reservoir cap -1-  .

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   Opening cap on coolant reservoir

2. Move service clip -2-  on the bleeder valve -3-  to a vertical position.

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   Service clip on bleeder valve

3. Have a drip pan ready under the radiator.
4. Loosen spring clamp -4-  and disconnect coolant hose -5-  on the radiator.

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   Coolant hose on radiator

5. Disconnect coolant hoses for heating -1 and 2-  on the transmission.
   1. 5.1 Screw in adapter KS 65 from > VAS 6562 - Porsche Adapter Set for Cooling System Tester  on the coolant reservoir.
   2. 5.2 Open clamp on the right coolant hose (return) -2-  and pull off coolant hose. Collect emerging coolant.
   3. 5.3 Build up air pressure of max. 1 bar  via the adapter using > V.A.G 1274B - Tester for Cooling System  or compressed air hose and collect remaining coolant.
   4. 5.4 Release air pressure.
   5. 5.5 Re-fit coolant hose and secure with a spring band clamp.
   6. 5.6 Open clamp on the left coolant hose (supply) -1-  and disconnect coolant hose. Collect emerging coolant.
   7. 5.7 Build up air pressure of max. 1 bar again and collect emerging coolant.
   8. 5.8 Release air pressure.
   9. 5.9 Re-fit coolant hose and secure with a spring band clamp.

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   Coolant hoses for heating

6. If necessary, remove remaining coolant from the coolant reservoir by pulling off the coolant hose.
   1. 6.1 Open clamp -11-  using > VAS 6890 - Spring Band Clamp Pliers  and pull coolant hose -12-  off the coolant reservoir.
   2. 6.2 Collect emerging coolant.

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   Coolant hose on coolant reservoir

   Information 

   • On vehicles with auxiliary heating, there are additional drain points. 
7. On vehicles with auxiliary heating: Disconnect coolant hoses. 
   1. 7.1 Loosen clamps -6-  , disconnect coolant hoses -7-  and collect emerging coolant.

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   Coolant hoses for auxiliary heating

8. Secure coolant hoses.