Air conditioner is not working inside and what is the problem as our window steam up on rain day

a fix for this is to run the ac
this although make it cold removes the moisture from the air inside the car and reduces the fogging up
if you have climate control run it or if not run the heater at the same time to take the edge of the cold
The air conditioner works by removing water vapor from the air through a condensation process there by making the air feel cooler
that restricts the moisture available to fog up the windows

this could be two items that i can think of
1st could be a stopped up cabin air filter , a low air flow would be felt out the vents on blower high setting

2nd sometimes a small hole develops in your heater core allowing a tiny bit of your cars coolant to flow into heat chamber , this gets evaporated by air flow thru heat box and recondenses back inside car , telltale signs are stuffy smell inside car and slight drip of coolant on ground under car as problem persists

heater core replacment is needed to fix this problem

Hi breda
your car problem is that, the heater matrix is leaking inside the car.
it cause the coolant level to go down. Probably you have noticed that your car loosing coolant.
good luck

Either a hose isn't tight or has a crack in it. You could also have a defective heater core.

have a good look inside the vehicle as i suspect that their is a water leak into the car somewhere so its damp inside the car try lifting the mats and see if damp under the front carpets

to clear the interior of fog you must put the fan on recirc and #3 fan position.with the a/c on HOT.it will clear as soon as any heat from the engine is allowed to the heater matrix to dry out the interior.if you allow fresh air into the car with fogged up glass,they will get worse as the temp is warmer inside the car than out.(they collect condensation).

possible small leak in heatercore , a leak around windows,doorseals,or brought in by boots/clothing which is allowing moisture in

u do have a leak, have the head gasket tested for internal leak into the cylinders.

If only the AC indicator light is on but you are still getting warm air from the vents, this is not an issue.  Most newer cars run the AC compressor nearly all the time to prevent moisture accumulation inside the car.  Without the compressor running, your windows may steam up and hinder your visibility.

It may be set to recirculate the inside air, this is indicated by a symbol of a car with a swirling arrow inside, the button will be in with the climate controls. always use outside air if it is cold or raining and you will avoid fog