If the car heater has to be removed, first release the radiator. The simplest way to remove the radiator cap when the car engine is cold. It is important not to try to remove the radiator cap after driving the car or running for more than a few minutes.
When the car is hot, refrigerant in the fridge is hot too. When the refrigerant is pressurized under extreme pressure because it is expanding from heat. If you try to remove the radiator cap when the coolant is hot it leaks out and is possible to burn. Make sure the car is cold when you try to open the radiator cap.
If the cap is off, go to the radiator at the bottom of the driver's side. There is a valve called "pit-cock". Take a large pan under the radiator and the valve. Loosen the valve to let the antifreeze fluid spill. Allow the heater to drain all the coolant into the bucket or pan. When it was empty, close the tap valve. The normal radiator will hold about a gallon frost guard. Trucks or larger vehicles can handle more.
Be sure to save the coolant that is empty. You can take a canal to a can, and put it in an automated store or shop that recycles automotive fluids. Do not mix antifreeze with other liquids, such as oil, as this creates hazardous waste that can not be recycled.
Now that the radiator is empty, refill with water and turn on the car. You can leave the radiator cap. Keep an eye on the radiator tube where the cap is attached. Look at the level and color of water in the radiator. Water should be in the radiator. When the thermostat is opened – as long as the vehicle is running – the water level drops immediately and the coolant flows out of the liquid driver's side and is green (or orange, depending on the antifreeze brand). If the water is completely green, stop the car and place the bucket or pan under the pit and open it. Replace all green fluids on the radiator. Place the drained fluid in a jug and put the radiator again with clean water.
The radiator cap must be run like the radiator door, watching the radiator outflow. Once the thermostat opens again, the water will fall and will be slightly green. Repeat this drainage and filling process until the water is completely clean. Usually it requires three or four rinses with water.
Now follow the instructions on the back of the new gallon antifreeze. The coolant must be mixed with water at certain levels, depending on the climate. Mix the coolant at a suitable concentration and pour into the empty refrigerator, making sure that the sleeve pin is closed. Run the car.
This time, when the thermostat opens, the water will usually be clean. Empty the cooler again and then refill with the correct coolant / water. Observe the coolant level and put it down when the thermostat is re-opened. Finally, replace the cap and perform the vehicle for 30-45 minutes.
If you have done the job properly when you have frozen the car, the level of the coolant should be almost complete and should not be overcharged.
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