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Table of Contents > Cooling > Flushing cooling system

VW Tiguan 4-cyl. Direct Injection Engine (1.8l and 2.0l, EA 888 gen III) ➜ Flushing cooling system

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4-cyl. direct injection engine (1.8 l and 2.0 l, 4 V, EA 888 gen III, turbocharger, chain drive) - Edition  
02.2021  
Check pressure relief valve in cap.  
– Screw cap -1- into adapter for cooling system tester -V.A.G  
1274/9- -2-.  
– Connect adapter for cooling system tester -V.A.G 1274/9- to  
cooling system tester -V.A.G 1274 B- using connecting hose  
supplied.  
– Build up pressure using hand pump of cooling system tester.  
The pressure relief valve must open at a pressure of 1.6 to  
1.8 bar.  
– Renew filler cap, if pressure relief valve does not open as  
described.  
1.4  
Flushing cooling system  
⇒ c1.4.2 ooling system, quick reference guide”, page 313  
1.4.1  
Flushing cooling system  
Note  
The coolant must be drained before the system is flushed.  
Then the cooling system must be filled with distilled water.  
The cooling system is then flushed with approx. 19 litres  
of distilled water. Then, the distilled water is replaced by  
coolant (mixture ratio 50:50).  
Never reuse old coolant.  
For a quick reference guide, refer to ⇒ c1.4.2 ooling sys‐  
tem, quick reference guide”, page 313 . The quick reference  
guide contains the basic steps of the procedure. It might be  
helpful to print out the guide and tick off the corresponding  
work steps after having performed them.  
1. Cooling system/coolant  
291  
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4-cyl. direct injection engine (1.8 l and 2.0 l, 4 V, EA 888 gen III, turbocharger, chain drive) - Edition  
02.2021  
Special tools and workshop  
equipment required  
♦ Coolant flushing and filling device -VAS 531 007-  
♦ Test adapter -VAS 691 005/5-  
♦ Spring-type clip pliers -VAS 6362-  
♦ Drip tray for workshop hoist -VAS 6208-  
♦ Suction-jet pump from cooling system charge unit -VAS  
6096-  
♦ Refractometer -T10007 A-  
♦ Compressed air connection with 6 … 10 bar(g)  
292  
Rep. gr.19 - Cooling  
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4-cyl. direct injection engine (1.8 l and 2.0 l, 4 V, EA 888 gen III, turbocharger, chain drive) - Edition  
02.2021  
♦ Assembly tool -T10118-  
Schematic overview of coolant flushing and filling device -VAS  
531 007-:  
1. Cooling system/coolant  
293  
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4-cyl. direct injection engine (1.8 l and 2.0 l, 4 V, EA 888 gen III, turbocharger, chain drive) - Edition  
02.2021  
1 - Container with distilled wa‐  
ter  
❑ Fill with 30 l of distilled  
water  
❑ 19 litres of this are re‐  
quired for flushing  
❑ 11 litres are a safety re‐  
serve and remain in the  
canister  
2 - Container with coolant  
❑ Fill with 30 l of coolant  
❑ Anti-freeze to ap‐  
prox. -36°C (mixture ra‐  
tio 50:50)  
❑ 18 litres of this are re‐  
quired for flushing  
❑ 12 litres are a safety re‐  
serve and remain in the  
canister  
3 - Empty container  
❑ For used coolant  
4 - Empty container  
❑ For used coolant  
5 - Suction hose  
❑ Comes from connection  
2 on sight glass  
6 - Sight glass  
❑ When opaque, clean  
sight class with a nylon  
brush  
7 - Pump  
❑ Cut-out pressure ap‐  
prox. 1.5 bar  
8 - Valve block  
❑ With pressure gauge and shut-off taps  
9 - Drain hose  
❑ Connected to valve block for releasing pressure  
10 - Flushing hose  
❑ Connected to breather hose of coolant expansion tank for flushing  
❑ Comes from connection 1 on sight glass  
❑ Seal with plugs when not in use  
11 - Plug  
12 - Hose clamps  
❑ Qty. 4  
13 - Cleaning adapter  
❑ Approx. 15 cm in length  
❑ For cleaning coolant flushing and filling device after flushing  
❑ Connected between valve block and flushing hose ⇒ Item 10 (page 294) (10)  
14 - Extraction adapter  
❑ Approx. 100 cm in length  
294  
Rep. gr.19 - Cooling  
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4-cyl. direct injection engine (1.8 l and 2.0 l, 4 V, EA 888 gen III, turbocharger, chain drive) - Edition  
02.2021  
❑ Connected to suction hose ⇒ Item 5 (page 294) (5) for extracting coolant  
Procedure:  
– Remove engine cover panel ⇒ page 81 .  
– Drain coolant ⇒ page 278 .  
– With coolant hose pulled off, pour approximately 1 litre of  
distilled water into the coolant expansion tank.  
– Drain coolant into drip tray.  
– Re-connect detached coolant hoses.  
Preparing coolant flushing and filling device -VAS 531 007-:  
– Fill container »1« with 30 l of distilled water.  
– Fill container »2« with 30 l of coolant. Mixture ratio is 50:50  
for anti-freeze protection down to approx. -36°C.  
– Empty containers »3« and »4«.  
– Remove valve block from plug-in connector on equipment  
trolley.  
– Connect coolant flushing and filling device -VAS 531 007- to  
battery.  
Bleeding coolant flushing and filling device -VAS 531 007-:  
– Connect suction hose -A- to container »1« with distilled wa‐  
ter.  
– Connect drain hose -arrow- to plug-in connector -B- on valve  
block.  
– Close shut-off taps -A- and -B-.  
1. Cooling system/coolant  
295  
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