You have a blown head gasket, cracked head, or both. The engine must be taken apart and head gasket & head possibly replaced. If you drove it in this condition for a long period of time you may have totally destroyed this engine and it will need a complete overhaul.
If the car overheated, you may have warped the aluminum head. You may have to have the head shaved and a new head gasket put in.
Chances are it wont read the coolant levels meaning your car will go bang!
Could be overheated coolant or just leaked oil burning off your exhaust headers
You may have a leak of coolant. Take your car to a shop and tell them you are smelling coolant and may have a leak.
How do you know that it is your car?
It will be safe to drive short distance as long as the car does not over heat. You can top up the engine coolant or use water/coolant mixture till you fix the problem which could be leaking hose pipe. leaking radiator or faulty radiator cap
If you were to overfill the coolant in your car, then it would start to overflow and come out of the car. The most damage that this would probably do would be getting the coolant on the ground and wasting it.?æ
It wont start
check the distributor cap and rotor also check the coolant temp. sensor.. can cause a hard start condition when cold.
Your car wont start. lol
It probably needs some coolant. This is the chemical that is put in the car in order to keep the air conditioner cool. If your air conditioner is not getting cold either the coolant has run out or leaked out.
What have you welded ?