Aircon maintenance air condition maintenance

The diagram is here

https://fusesdiagram.com/volkswagen/fuses-and-relay-volkswagen-polo-9n.html

.

RELAY, AIR CONDITIONING for VW POLO » Electrics original ...

www.euspares.co.uk > ... > POLO (year 1975 - 2021)

RELAY, AIR CONDITIONING for VW POLO online shop for TOP car parts brands in the category Electrics ? Affordable Relay, air conditioning ? Original-quality ...

..

Controller signals may not have to preach on hvac assembly, need to check the controller to the hvac line Motor Part Store Motor Parts Wholesale

There is no relationship between the air conditioning system and the gear box in the vehicle.

The engine operates the aircon compressor via the serpentine belt from the crankshaft pulley and if the aircon is operating normally the aircom compressor will not be faulty either.

If you are having problems with the gearbox it has nothing to do with the aircon system. The issue will be with the gearbox itself.

the heater core has a leak in it and yes it can get into the aircon system as its in the same system

aircon gas needs topping up.

Replace the cabin air filter, located behind glove box.

Problem with Aircon clutch OR your reves are to low ,,,with aircon working revs should be about 650 rpm min

If aircon clutch then it is trying to seize up....

It could be a part called the Idle control Valve. It regulates the Idle speed and keeps it smooth. If it is choked up with carbon gum or the little motor inside it is faulty then it will not allow enough air too pass for smooth idle. When you put your air con on the engine is under more load because it has too turn the aircon pump so it will stall. Also you have a little device on aircon cars that raise the idle a little to compensate for the extra aircon load. If this is not working it could be that.

This is a great site for aircon FAQ's:
http://www.id-usa.com/how_to.asp
It can show you how to check what gas you are using, how to check the system and how to top it up if neccessary, there is plenty of info and video if you need it.
I found it a great help when my wife had problems with the aircon in her Pontiac.

im prety sure the air ducts can get blocked at certant points
your best bet would be a aircon service