If you don't have a draining nozzle at the bottom of your radiator than you'll have to disconnect your bottom radiator hose to drain the radiator fluid.Easy to do,but just make sure you have a drain bucket handy when you take the radiator hose off.Radiator hose is just ckamped on and most likely the only tool you need is a flat head screwdriver to loosen up the clamp and pull the radiator hose off.
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Move your badass w-body (a.k.a. Pontiac Grand Prix) to a level area and set the parking brake. Pop the hood and touch the radiator. If it's warm let it cool before you continue.
Twist the radiator cap one full turn (Remember to be careful because even when radiators are cool they can still erupt coolant)
Place any type of container (bucket [but has to be able to hold 2 gallons]) underneath the radiator and blow the drain plug. (The drain plug on your Grand Prix is on the driver's side bottom of the radiator facing the engine.)
Loosen the drain plug and let the old coolant to drain completely. (You may need a wrench to loosen the drain plug)
Dispose the old coolant in a sealable container (The coolant is very toxic to people and pets, so you gotta be careful)
Shut the radiator drain plug and fill the radiator with water.
Run car for a little bit and repeat the process again. (Let car cool, and drain water)
Close the drain plug and fill the radiator with fresh coolant until it's about an inch from overflowing. (DO NOT USE ORANGE DEX COOLANT IT IS HARMFUL FOR YOUR HEADGAKETS) You will need 3 gallons of coolant (SE, GT, GT1, GT2, GTP, GTP Comp G.) and 4 for the GXP model. Be sure to check the drain plug for any leakage.
Start your car and turn the heating system to high. Allow the car to keep running until the cooling fan turns on twice. After that happens, switch off the engine and check the coolant level. If it went down, add more coolant. If not, put the radiator cap back on and close the hood.
The low coolant sensor is located on the side of the radiator right below the radiator cap. There is a connector with two wires going to the sensor. The sensor is removed by taking off the spring clip and the pulling on the sensor. The sensor makes a seal to the side of the radiator with two o-rings. Just make sure the car is cool before you do this. Sometimes it just needs a good cleaning. Good luck.
If you are to change the engine coolant first be sure that the engine is cool. Remove the radiator cap and unscrew the drain plug of the radiator "pet-****" located either on the bottom or low side of the radiator, Once the radiator is empty, fill again with water and run the engine. Repeat this process if necessary. Wait till it cools and drain again. Ad the coolant as per manufacturer's guidelines and complete with water. This should clean your engine coolant as well as your reservoir.
if it has a drain plug it would be on one of the lower corners of the radiator. If there isn't one, which I think the case is. Remove lower coolant hose from radiator and you'll be able to remove coolant that way.
There is only one drain point. Drain the coolant from the system at the radiator. This will remove coolant from the engine. Be sure and have the heater set to hot. Flush the system with a water hose. Fill the system with a 50/50 mix of antifreeze and distilled water. Do not use tap water. Start the engine with the radiator cap off and keep adding coolant until it will take no more and you see no more air bubbles escaping from the radiator. If there are schrader bleed valves on the engine cooling system use them to remove any more trapped air. Put the cap on and start the engine and let it run for 15 minutes while you check for leaks. I would replace the thermostat at this time as it is just good preventive maintenance.
drain the new collant into a container so you can reuse it.check the thermostat by putt ing it in a bowl of boiling water youwill see it open up if it is working correctly next it is possible that the radiator needs cleaning out----job for a radiator service centre