2004 vow polo difficult to start in the morning

https://www.fiatforum.com/stilo/125372-stilo-loose-connection-p1688.html

Ask a Volkswagen dealer.

Perhaps the timing is wrong:

https://www.google.com/search?q=polo+2004+1.9+tdi+timing+marks&client=firefox-b-1&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiZlb6KvMbaAhWCzIMKHf6BCKYQsAQIQQ&biw=939&bih=703

probably a dead battery
have a load test done first and go from there

if its engine code is AEX then this is it
renew bolts
40 nm
60 nm
90 degrees
90 degrees

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Yes i have worked on these cars but never seen a auto version as yet ?if you get a new one then you will see where it has to fit as some are inside the gearbox and some on the linkage but wherever it is it will be the same as a VW polo and one i done on a old golf was under the mechanism in the cab for the gearchange and wasnt too difficult to change

you might find the fuse diagram on the inside of the fuse box cover under the hood.....hope this helps.....cheers

Tty a temperature sender unit.

you mean throttle body
will assume petrol EFI

the ecu will have fault codes to be read

the problem may also be the plastic accelerator pedal sensor