New car for me with 70,000 miles on the clock, got it in September. Within 2 weeks the audi overheated, took it to garage, did head gasket test, not that, did thermostat test.. faulty thermostat. Replaced that, all fine. But now about 12 weeks later the temp gauge keeps going up every time I drive the car, it'll go up 2/3 bars for about 30 seconds and then drop right back of to 90 degrees again, it only does this once a day despite how much I drive it. I took car back to garage who fitted thermostat and they couldn't find a problem, took it to another garage, they did a pressure test thing for the coolant to see if there was a leak, no leak. So assuming now it must be another faulty thermostat getting stuck? Or a crappy sensor?
Please does anyone have any ideas? Or have you had a similar problem? Car still drivable as it doesn't actually "overheat"...
Thanks in advance for any response.