Section 32 (Cooling System Specifications & Drive Belt Routing): Servicing
WARNING: This page is about a different car, the 2002 Audi S4, 2001 Audi S4, and 2000 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.
Coolant does not usually need replacing. In case of larger repairs when coolant needs to be drained, new coolant must be used because, old 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. Drain cooling system. See DRAINING & FILLING COOLING SYSTEM under DRAINING, FILLING & BLEEDING. Flushing system should remove most coolant residue.
Coolant to water ratio must not exceed 60%. Frost protection and cooling efficiency will decrease if the percentage of coolant is too high. For coolant to water ratio, see COOLANT MIXTURE RECOMMENDATIONS table.
COOLANT MIXTURE RECOMMENDATIONS
| Application | Specification | |
|---|---|---|
| Freezing Point | ||
| Down To -13F° (- 25°C) | 40% Coolant | |
| Down To -31°F (- 35°C) | 50% Coolant | |