yes it is!
There is obviously a leak somewhere
Turn on the heat, and see if the same smell is there. The most likely cause is a coolant leak in the heater core, causing the coolant fumes to get into the ac.
Clean water should be used and mixed with the proper coolant for your car.
When the AC is running, the engine must work significantly harder to perform the same tasks it normally does. Extra work translates into more energy, which in turn creates additional heat. Without the proper level AND mixture of coolant, the car engine will overheat.
I'm thinking the coolant level in the reservoir is to high to begin with. The cooling system has to work harder when the ac is running. The coolant expands as it heats up. If the coolant level was high to start with it will push out the excess.
are you sure it is coolant? is the elbow located on the firewall? if that's the case then it's not coolant, it's condensation from the AC doing what it is supposed to do.
No. Prior to 1995, home AC systems used R-22 and automotive AC systems used R-12. From 1995 onwards, home AC systems used R-410A and automotive AC systems used R-134A.
Based on the info you've provided (none) my expert answer as a mechanic is NO it will not. Take your car to a certified auto ac repair tech, rather than damage it or yourself. The stuff in the ac system is called refrigerant or freon, not coolant.
No, they have different boiling points and heat transfer capacities.
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Make sure the connector to the Coolant Sensor is not corroded. If so replace with a new connector