How to change engine thermostat on VW Golf IV Van (1J1) – replacement guide
Volkswagen Golf GTI Mk IV Coolant Flush and Replacement (1999-2005) - Pelican Parts DIY Maintenance Article
VW Golf MK4 Coolant Temperature Sensor Location - Q&A on G62 Sensor & P1255 VW Code
Does anyone know where I can get one of these coolant hoses for a mk4 golf 1.8t? It's this one that runs under the sensor connected to the upper rad hose :