Why would radiator fluid be leaking out of the radiator system vent around the bolt on a 1993 Ford Thunderbird 3.8L?

If it is red or brown it is the transmission cooler (in the radiator) leaking. If it is milky white, internal engine oil leaking in to the cooling system, head gaskets.

Can be leaking from a hose not secured properly or a hole in the system.

leaking head gasket or improper fluid in cooling system

The radiator drain plug on a 1992 Ford Thunderbird is located on the bottom, left side of the radiator. It allows for the cooling system to be quickly drained during maintenance.

Is it leaking from the water pump or radiator? Is the system properly pressurized?

Orange liquid leaking from any vehicle is usually a sign of a leaking cooling system. If the location is in the front then it is likely an issue with the radiator.

the little gray box on top the a.c. compressor or by the radiator.

A leak in a coolant system can usually be fixed by replacing a hose. If the leak is at the end of the hose, a new clamp might be necessary. If the radiator is leaking, the radiator might need to be replaced.

Sometomes it is hard to get all of the oil out of the cooling system. However the place that replaced the engine should flush the cooling system until it is clean. Also if your car has an engine oil cooler , it could be the cooler in the radiator and not have been the engine in the first place.

The question is referring to pour in type cooling system sealers such as Stop-Leak. If the radiator itself is leaking Stop-Leak will likely come right out as it is designed for small seal and gasket sealing.

The water outlet, also called a petcock is located near the lowest point in the cooling system and is used to drain coolant from the engine. The petcock typically has wings, which are designed for better grip when turning the valve. If coolant is leaking from this point, it may be the petcock is partially opened and might need only to be closed completely to stop the leaking. The petcock is press-fitted into the bottom of the radiator. A leak around the petcock can be caused by a crack around the collar or a solder joint that has broken. Have a radiator shop pressure test the radiator to make sure there are no other problems with the radiator, such as other cracks. During a pressure test air is pumped into the radiator and then it is dunked into a water tank. Air bubbles escaping from the radiator indicate leak sites and will need to be repaired. --mark

The transmission cooler is built into the radiator, and the tubes on the cooler are leaking Trans. fluid into the engine coolant. Need to replace radiator.

put cooling system flush in the radiator and follow the directions but make sure the heater is on while you do it.it will clean both your cooling and heating systems.

Pressure test system to observe leak

Pressurize the cooling system. If you see coolant leaking out, you have a leak. Use a flashlight to determine where it's coming from. If the coolant is leaking out through the radiator fins, it's a leak in the radiator. Harbor Freight sells a pressure tester for ~$85, or you can probably rent one from an auto parts store.

Wrong PSI radiator cap or defective radiator cap installed. NEW ANSWER: The above answer is true ( COULD BE ) But I would bet you have a BLOWN / LEAKING head gasket that is building pressure in the water / cooling system.

It could be caused by a defective pressure cap on the radiator cooling system.

A 1991 Subaru Impreza might overheat because of a leaking cooling system or because of a damaged thermostat. You might also have a damaged or leaking radiator or a cooling fan that is not working.

Then you either have a blown head gasket or a cracked head. Stop driving the car immediately an have it repaired. A rare possibility is that the transmission cooler inside the radiator is leaking fluid into the cooling system.

sounds like pressure relief valve if replacing the valve doesn't stop the leaking you may have to much pressure in your cooling system mainly a Head Gasket leak.

If it is an automatic transmission, the cooler in the radiator is most likely leaking into the coolant system.

look with a light to see where coolant is leaking from. whatever part is found to be leaking should be changed. If the car may not be worth a proper repair you can try a cooling system sealer to see if it might stop the leak

take out the hose out of the radiator. then put a hose in the radiator hose, and let the car run with the heat on. it will take about 10 minutes. the coolant will be coming out of the radiator. then once the radiatior is leaking clear, you can put the hose back on, because it is flushed out.

sounds like a leaking head gasket have a pressure chek done on cylinders and cooling system

If your antifreeze is green and it's foaming then you are getting air into the system. It is coming in by way of the water pump or you have a cylinder head gasket leaking compression.