1.8L Turbo
Engine number (engine code and serial number) can be found at front, on machined surface, next to joint between engine and transmission. (Scheme 1) There is also a sticker, on cylinder head cover showing engine code and serial number. Engine code is also included on vehicle data sticker.
Scheme 1
3.2L V6
Engine number (engine code and serial number) can be found at front, on machined surface, next to joint between engine and transmission. (Scheme 2) There is also a sticker on cylinder head cover, showing engine code and serial number. Engine code is also included on vehicle data sticker.
Scheme 2
Scheme 3
Scheme 4
Scheme 5
COOLING SYSTEM PRECAUTIONS
A new coolant additive, G12, is being used. G12 is identified by its Red color. Never mix G12 with any other coolant additive! You can see contamination of G12 with other color coolants by its color (Brown).
G12 coolant additive may be used in older vehicles when original coolant is drained and cooling system is flushed. Contaminated coolant must be drained immediately and cooling system flushed. See SERVICING .
| CAUTION | Coolant must not exceed 60%. Frost protection and cooling efficiency will decrease if the percentage of coolant is too high. See COOLANT MIXTURE RECOMMENDATIONS table. |
| CAUTION | If radiator, heat exchanger (heater core), cylinder head or cylinder head gasket, has been replaced, completely replace engine coolant. |
| Application | Specification | |
|---|---|---|
| Freeze Point | ||
| Down To -13° F (- 25° C) | 40% Coolant | |
| Down To -31° F (- 35° C) | 50% Coolant | |
COOLANT MIXTURE RECOMMENDATIONS
DRAINING & FILLING COOLING SYSTEM
| WARNING | Cooling system is pressurized, when engine is at operating temperature. Wear gloves, and other appropriate protection. Slowly and carefully release system pressure, before performing any repairs. |
Scheme 6
- Turn engine off, and allow to cool. Place appropriate drain pan underneath vehicle. Open cap on coolant expansion tank. Raise and support vehicle. Remove noise insulation panel, below engine compartment. (Scheme 6)
- Turn drain plug, on radiator, counterclockwise. Install an extension hose to connection, if necessary. (Scheme 7) Disconnect lower coolant hose, from oil cooler, and drain off remaining coolant. (Scheme 8)
- Screw in drain plug. Fill cooling system. See «COOLING SYSTEM SPECIFICATIONS»(/audi/tt/8n-1998-2003/remont/accessory-drive-belts/#cooling-system-specifications-drive-belt-routing). Top coolant off to MAX mark, on expansion tank. Start engine. Raise engine speed to 1500 RPM for approximately 2 minutes, and at same time fill with coolant up to over-flow hole on expansion tank.
- Install expansion tank cap. Continue to run engine, until radiator cooling fan turns on. Turn engine off. Check coolant level, and top off if necessary. When engine is at normal operating temperature, coolant level must be at MAX mark, on expansion tank. When engine is cold, coolant level must be between MIN and MAX marks, on expansion tank.
Scheme 7
Scheme 8
| WARNING | Cooling system is pressurized, when engine is at operating temperature. Wear gloves, and other appropriate protection. Slowly and carefully release system pressure, before performing any repairs. |
Scheme 9
Scheme 10
Scheme 11
- Turn engine off, and allow to cool. Place appropriate drain pan underneath vehicle. Open cap on coolant expansion tank. Raise and support vehicle. Remove noise insulation panel, below engine compartment. (Scheme 9)
- Turn drain plug, on radiator counterclockwise. Install an extension hose to connection, if necessary. (Scheme 7)
- Remove lower coolant hose for after-run water pump. (Scheme 10) Drain remaining coolant. Connect hose to after-run water pump. Close drain plug at radiator.
- Fill coolant tank with at least 8.4 qts (8 liters) of coolant mix. See «COOLING SYSTEM SPECIFICATIONS»(/audi/tt/8n-1998-2003/remont/accessory-drive-belts/#cooling-system-specifications-drive-belt-routing). Screw VAG adapter 1274/8 onto expansion tank. Mount cooling system filler VAS 6096 on VAG adapter 1274/8. Hold air discharge hose (1) over a small vessel (2). (Scheme 12)
- Close both valves "A" and "B", lever at right angles, to direction of flow. Connect hose (3) to compressed air supply. (Scheme 12) Air pressure should be 87-145 psi (6-10 bar). Open valve "B", in direction of flow. (Scheme 13) Suction jet pump generates a vacuum in cooling system. Pointer of indicator must move into Green zone.
- Briefly open valve "A", in direction of flow, to fill hose of coolant tank VAS 6096/1, with coolant. Close valve "A" again. Leave valve "B" open, for another 2 minutes. Suction jet pump continues to generate vacuum in cooling system. Pointer of indicator must remain in Green zone.
- Close valve "B". Pointer of indicator must settle in Green zone, vacuum in cooling system is then sufficient for subsequent filling. Repeat procedure if pointer is below Green zone.
- Remove compressed air hose. Open valve "A". Vacuum in cooling system causes coolant to be drawn out of coolant tank VAS 6096/1. Cooling system is now filled. Check coolant level, and top off to MAX mark, on expansion tank, as necessary.
- Start engine, and raise engine speed to 1500 RPM for approximately 2 minutes. Fill coolant up to over-flow hole in expansion tank. Close expansion tank cap. Continue to run engine at idle, until radiator cooling fan comes on.
- Check coolant level, and top off as necessary. When engine is at normal operating temperature, coolant level must be at MAX mark, on expansion tank. When engine is cold, coolant level must be between MIN and MAX marks, on expansion tank.
Scheme 12
Scheme 13
SERVICING
Coolant does not usually need replacing. In cases of larger repairs when coolant needs to be drained, new coolant must be used because old coolant has been exposed to oxidation and dirt. Flush cooling system when replacing coolant. To flush, fill system with clear water, and run engine for approximately 2 minutes. Flushing system should remove most coolant residue. Fill with mix of clean water and manufacturer recommended coolant. See COOLING SYSTEM SPECIFICATIONS .
ADJUSTMENTS
Serpentine belt is self-adjusting. (Scheme 14)and (Scheme 15).
Scheme 14
Scheme 15
| Application | (1) Specification | ||
|---|---|---|---|
| Coolant Replacement Interval | (2) | ||
| Recommended Coolant Type | (3) Red G 012 A8 D | ||
| Coolant Capacity | |||
| 1.8L Turbo | 5.3 qts. (5 liters) | ||
| 3.2L | 8.4 qts (8 liters) | ||
| Radiator Cap Opening Pressure | 1.4-1.6 psi (1.4-1.6 bar) | ||
| Thermostat | |||
| 1.8L Turbo | |||
| Starts Opening | 188° F (87° C) | ||
| Fully Open | 215° F (102° C) | ||
| 3.2L V6 | |||
| Starts Opening | 176° F (80° C) | ||
| Fully Open | 221° F (105° C) | ||
| (1) Quantity of coolant can vary depending on equipment installed in vehicle. (2) Manufacturer does not require routine coolant replacement only if major repair is necessary. If adding to coolant, use manufacturer recommended coolant. Coolant mixture must be at least 50 percent, but no greater than 60 percent. (3) DO NOT mix Green and Red coolant. Mixing these two coolant types will cause severe engine damage. Use ONLY G 012 A8 D Red coolant. | |||
| (1) | Quantity of coolant can vary depending on equipment installed in vehicle. |
| (2) | Manufacturer does not require routine coolant replacement only if major repair is necessary. If adding to coolant, use manufacturer recommended coolant. Coolant mixture must be at least 50 percent, but no greater than 60 percent. |
| (3) | DO NOT mix Green and Red coolant. Mixing these two coolant types will cause severe engine damage. Use ONLY G 012 A8 D Red coolant. |
COOLING SYSTEM SPECIFICATIONS
COOLANT RECOMMENDATIONS
| CAUTION | Do not use G 011 A8 C. The two different coolant additives G 011 A8 C and G 012 A8 D must not be mixed together. Otherwise this can result in serious damage to the engine. |
All engines are filled with antifreeze and corrosion protection fluid G 012 A8 D meeting specification TL VW 774 D. When topping off, always use G 12 (red fluid).
If the fluid in the expansion tank is brown, this means that G 012 A8 D has been mixed with another type of coolant. In this case, flush out the cooling system and put in new coolant (repair measure). To flush the system, fill it with clean water and run the engine for about 2 minutes. This should remove practically all of the old coolant.
G 012 A8 D and coolant additives marked "meeting specification TL VW 774 D" prevent frost and corrosion damage, stop scaling and at the same time raise the boiling point of coolant. For these reasons the cooling system must be filled all year round with the correct anti-freeze and anti-corrosion additive.
Protection against frost must be assured to about -25 C (in arctic climatic countries to about -35 C). The coolant concentration must not be reduced by adding water even in warmer seasons and in warmer countries. The anti-freeze ratio must be at least 40 %.
If greater frost protection is required in very cold climates, the amount of G12 can be increased, but only up to 60 % (this gives frost protection to about -40 C or -40 F).
See also:
• SERVICING
• COOLANT MIXTURE RECOMMENDATIONS