Hi Guy's, This is my first post, So I hope that I do it right, Here goes. I am an Auto-Electrician and I am working on a Mercedes C250 Turbo diesel 1998 model 202,128, It came in for the aircon not working, It needed Gassing so that has been done by the garage that sent it in to us, The aircon compressor would not pull in, so after qiute a bit of testing we decided to change the control panel, The Aircon now works and gets the temperature down to about 4 degrees celsius, so it appears that it is working ok. Now the only problem is that the compressor will only pull in when the engine temperature rises to about 80 degrees celsius, and if you drive the car from cold it struggles to get up to 80 degrees, if it is then left ticking over for a while, it gets up to 80 + and then you can drive it and the temperature stay's up and the aircon works fine, My Questions are:- should the aircon on this model only work when the engine warms up or should it work as soon as the engine is started, (I have ordered a new thermostat, to see if I can get the engine to warm up quicker).