Problems start Passat TDI 115CV 1999

Hello.
I have a 115CV Passat TDI of 1999 and for some time it has been a lot of cold starting.
If you try to start within a few hours of turning off there is no problem, but since it is standing for more than one day it costs a lot.
Thank you very much to whoever helps me.

Do a test if you can look for some cables to give it a bottle when the time it costs and try to have if you start the first one you can also look at the buses that the diesel filter carries if any is deteriorated and the circuit may take the air and also look at the one that carries below that filter
I hope I have helped you

Hello, it throws a lot of black smoke when you start it in the morning? You can have 1 or perhaps 2 melted healers and that do not hot too much, so it costs you so cold in cold ... I would exchange the 4, and it will always start you to you first ... it is better for it I am wrong but it can also be that the problem.

Thank you very much for the help.
The verification of the heater has very difficult access. Especially that of the two rear cylinders.
I will take the car to the workshop