Post the serial number for the truck you can't do anything to repair the air on unit yourself

Linde H25D? I didn't hear about this model for a while. Air-conditioning for it? Hmm, I'd suggest you buy an aircon at the place you keep it. It would help a lot, I guess. When the air in the area you own it will be cold, you won't have any problems with this stuff. You should check http://airconservicing.org because recently I was looking for an air conditioner, and found that website. Let's hope that you won't have any more issues with your Linde and its options. Also, don't freeze the place. It can break something in the motor.

Thank you very much for the reply......I found out that there was problem with the wire controlling the tension and the heat and cold.......

Is there any way to know where to check the liquid for the cold??

Serial number of the truck would help. They do have a habit of the cable coming off the back of the switch on the control panel I've Seen that lots. If not the unit might need re-charging