Report "Hiya I have a Vauxhall Astra R Reg and having a few problems.... Around 3 months ago I changed the thermostat as there was only warm air flowing into the car, even after it had been running for sometime - Result - perfect, warm air. Also change the switch unit (under the pollen filter) to allow all positions to blow as this was also faulty - working fine now. Over the last two weeks I have added 2ltrs of oil - seems to be burning this now!! Water level does move aswell. No (fish eyes) water mixing with the oil and no noticable loss of power? The temp gauge goes right up to 100 (cant hear or feel the fan coming on) and then shoots right down to around the 80 mark??? very wierd! Also the heating in the car is warm and not HOT again ???? Could this be another faulty Thermostat??"