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To flush your radiator. Find where the two hoses go into the firewall in your engine compartment and disconnect them.Next, take off your radiator cap and open the drain valve located on the bottom left side of you radiator.Using a garden hose with a sprayer attachment,spray water into one of the hoses from off of your firewall.This will flush out your entire system till the water comes out clear.If you want to flush out your heater core do the same thing into the hose connections for the heater core.
Dont flush untill you have removed the heater control valve because it has a piston and diaphragm setup vacuum on the line will cause the diaphragm to expand and not close causing the valve and hose to fail no matter how tight you clamp it. heater control valve is located at rear of engine bay passenger side near heater core hoses.
Here's a link to read about your Olds.Here's a kit that has instructions how to flush.You need to drain the system, the drain valve is located on lower driver side of the radiator. When the system is dry, shut the valve and fill the radiator with new coolant. Fill until the coolant runs out the top, fill the overflow tank to cold mark. Start the engine and let it warm up until the thermosat opens. Standing in front of the vehicle there is a small bleed valve located on the right just above the thermostat open it until the coolant comes out and shut it back off. Located on the left of the engine just above the water pump is another bleed valve, do the same with it. You may have to do this two or three times before you have all the air out of the system.
Hi, if there is not a petcock or plug at the bottom of the radiator, you can just remove the lower radiator hose to drain the coolant. Many cars do not have drain plugs. Please let me know if you have more questions and thanks for using FixYa.
To "flush" the radiator would require special equipment, if you just want to change your coolant open the drain valve in either the lower left or right corner of the radiator, make sure you have a container under it to hold about a gallon and a half. When done draining close valve and refill, start car and allow air to purge from system, usually when the heater inside the car is blowing warm air all the air has been purged and the coolant system is full.
1.) the drain valve is a bolt type device under the radiator..
2.) different flush has different methods usually buy the flush and follow the instructions.. usually empty radiator by loosening valve underneath tighten back valve when drained pour in flush and top up with water start car and allow to run for 15 minutes (with cap off) cut off let cool and then drain..