Where is the rusty water coming from when I engage the air con. Never happened before??

You have condensation forming on your compressor. Since it is rusty, the exterior of the compressor must be rusted or it is running along an area that is rusted.

its probably from the condensate tray in the evaporater compartment --depends what make you have.

are you sure its rust, if you smoke the ac will pick up te smoke particles and nicotene etc and deposit them via the drain to the ground.

The drain hose for the air conditioning on the car must be clogged so the water cannot drain outside.

There is a drip pan beneath the cooling coils that are in your furnace. There should be a drain line coming from that. It is probably plugged up.

When the air conditioner is working, water condenses on the AC. A properly functioning AC will have a pan that catches the water and drains it away. It sounds like yours may have gotten the drain plugged and it is all rusty inside. Since it can not drain properly, it is being caught up in the airflow. You need to get it serviced - hopefully, they wo not have to replace the catchpan.

it might not be rusty water but green have a look if it is then it could be your condenser breaking down.

Wherever the water is coming from you should get it sorted asap. The water droplets being dispersed can contain Legionella bacteria, especially if the water has other physical contaminants, such as rust or dirt.

wot a load of shit! 1st, check the radiator dat its not leaking, if it is, u need a radiator sealant. if its only the muddy water u need a radiator coolant.

Maybe you have parked it in a river? best place for it!

The car is begging you to pull the plug and give it a French burial --drunk, face down in a cess-pool wrapped in the French flag (white stripes on a white background).