VW Transporter T4 (aka VW Eurovan) owners, if you're seeing coolant leaks or getting low coolant warnings, your plastic expansion tank (the coolant reservoir) might be cracked or the level sensor has failed. This is a complete replacement kit that includes the white plastic tank, the integrated coolant level sensor (with a 2-pin connector), and the pressure cap. It's a direct fit for a range of T4 models from about 1990-2003, with engines like the 1.9TD, 2.4D, 2.5 TDI, and 2.8 VR6. It matches OE numbers 701121407B, 357121321C, and others. This tank is crucial – it's where the cooling system stores excess coolant and allows for expansion as the engine heats up. A cracked tank or faulty sensor will cause coolant loss, leading to overheating and serious engine damage. Replacing it is a pretty straightforward job: let the engine cool, drain some coolant, swap the hoses and sensor connector over, bolt the new one in place, and refill. It's made from durable, heat-resistant PP plastic. Keeping your cooling system sealed and monitored is key to a healthy engine, especially in an older van like the T4. If you're losing coolant and can't find another leak, this tank and sensor combo is a very common fix. Always confirm your model year and engine code for the perfect fit!
