Hey guys bought my first audi a8 today 2.5 tdi done 223.000km
the guy i bought it from tricked me he said the car was absolutely fine and no water/coolant/oil consumption.
He insisted for a short test drive because he was in a rush so i took it for a test drive it drove nicely some bulb warning lights came on other than that everything was fine. Except the heater was just blowing out cold air and wouldnt blow hot air (it was on full blast on heat) the guy said it will start working when i drive it a little bit.
I had a journey of 150km to home and after 20min of driving and temp gauge at 90* it was still blowing cold air.
so i pushed the car a little bit and made it go upto 140km/h suddenly it was blowing hot air and i got very happy.
5min after that the temp gauge was still showing 90*ish but on the computer lcd i got a warning for high temperature but gauge was still showing 90.
I popped the bonnet and opened up the coolant resevoir , and there was alot of pressure built up it was really boiling but car performed fine. I topped up the coolant and after 10min the same happened and i had to fillup around 0,5l coolant.
So on calm low rpm driving there is no overheating but only cold air from the vents. Even sometimes on hard driving it doesnt blow hot air. The air gets hot around 5min before the overheating warning sign show up on the computer.
Overheating warning comes even with full coolant level
Can you guys please help me ? Locate the problem......i feel so scammed