Gates 02-06 Audi A4 4-Cyl. 1.8L Heater (Bottom) Molded Coolant Hose

If you're dealing with a coolant leak on your 2002-2006 Audi A4 with the 1.8L 4-cylinder engine, a common culprit is the bottom heater hose. This molded hose from Gates is designed to replace the original part, helping to restore proper coolant flow to your heater core and prevent further leaks.

Gates uses a strong, heat-resistant rubber compound for this hose, similar to what the factory uses. It's molded to the specific shape needed for your A4, so it fits right without a struggle. This means you won't have to fight with a stiff, generic hose trying to make it bend into place. Replacing this hose is a good idea whenever you notice signs of wear, like cracks, swelling, or leaks, especially if you're doing other cooling system maintenance.

Make sure to check the rest of your cooling system while you're in there. A new hose is only as good as the system it's connected to, so inspect your radiator, water pump, and other hoses for any signs of trouble.