Hi guys, my temp gauge on my s3 2001 model only goes up to 90 when stood still for 20-30 mins as soon as I drive it goes all the way down, vagcom said check temp sensor and thermostat so I have changed the temp sensor but it is still the same the heaters also get a little bit colder on a run, is this a stuck open thermostat ? It's also bringing the same fault code up. 17704, I got a 450 mile trip tomorrow will it be ok do you think ? It has been like this since I bought it in north Wales last week the drive home to South Wales was 261 miles I have probably done 500+ miles so far. cheers Chris.