How to change antifreeze in 2000 buick century. i need to know how to drain old fluid.

Thermostat is stuck.
change thermostat

could need change off trans fluid/oil as old oil has less viscosity

You mean difficult to shift...?
If so. Make sure gear fluid is at level (Full).


Mai Lor

drain raditor fluid then take off upper and lower hoses and put your house water hose in lower raditor hose and turn on water and let run for about 5 mins. to flush out raditor.
then run in top hose to flush back then lower hose again. that should clean it out.

Is it leaking oil or antifreeze?
If it's oil at this location ,it is most likely the seal on the sealed (not used) distributor hole plug.(an easy fix).
If it's antifreeze it will most likely be the gasket between the head and intake.A little work but not bad.You will have to pull the valve covers and the intake but the heads stay on.

You need to drain the old antifreeze and flush the entire cooling system with a commercial product such as Prestone Super Flush. After flushing according to the directions on the product you will want to fill the cooling sysstem with plain water and let it circulate through the system. Drain the system again and repeat the process until the water is clear of any antifreeze. Refill the system with the proper mixture of antifreeze. Make sure you use a quality antifreeze that is compatible with your make and model of car. The auto parts store personnel can help you select the right antifreeze. DO NOT refill it with Dexcool. That is the antifreeze that GM put in originally that is causing the problems. Dexcool not only forms a gummy sludge in the cooling system, it also attacks certain gasket materials and causes coolant to leak into the engine. Hopefully, this hasn't happened yet.

If you want to flush the raditor remove the big hoses, don't worry with the drain plug as you can't flush it good enough with the drain open anyway. If your just changing the fluild you can drain it and fill it but thats not flushing it. remove the therostate too and flush the engine and remove the heater hoses and flush them too. As you may not know what kind of antifreeze is in the motor now you need to get all of it out as some kinds of antifreeze don't mix and make a clogging slime instaed of good coolant. Do it right or take it to a shop that will.

Check your heater hoses. It sounds like your leak is a hose.

Yes Ma'am, Have a pressure check done on the coolant system and I'll be willing to bet you have a blown lower intake gasket.. Pls let me know..

the best way is with a automotive suction gun (about $6), drain the reservoir and then refill until the fluid is clear, but from past years of many such noise concerns coming through the shop u will end up replacing the power steering pump.