How do you change antifreeze in 2002 gmc Yukon?

Answer 1

Go bu a Haynes Auto repair Manual.

Consult your local library's on line resources for auto repair.

Find out how much coolant your car holds. Buy thatamount of ready mix antifreeze or alf that amount in un-mixed antifreeze. Most locales in the continental US require a minimium or 50% water to 50% un pre-mixed coolant for protection against freezing and boiling.

On a cold engine with the battery disconnected.

Drain what coolant is in the engine; open (they are usually reverse threaded so turn it to the left to open it; right to close) the petcock valve located on the bottom of your radiator on either the left or right side tank. Drain coolant into a large bucket. Sometimes you have a petcock valve that has a little pipe on it; this is for a hose to better drain the radiatior.

The coolant in the engine will be draining through the lower radiator hose into the radiator and into your large bucxket. To hurry things along you might remove the lower raiator hose from the engine (expect an uncontrolled flood so have large drain pan in place to capture the coolant) or just remove the cap on the radiator.

After draining is complete make sure the petcock is closed and all hoses are re-installed and tight. Turn the vehicle heater on full "hot".

Refill the radiator slowly; the little cooling tubes on modern radiators run side to side so it will take a while to get all the air out. you'll see this happening with the bubbles that show up at the radiator filler neck.

When the bubbles stop that just means there is still air trapped in the radiator and the engine; so start the engine. You can see when the the thermostat opens by the way the water level goes down in the radiator filler neck; when this happenes start pouring more mixed coolant into the radiator. When the level stops falling and the radiator is full put the radiator cap back on tightly and fill your radiator from the radiator overflow tank to the "cold" mark. Run the engine till it's FULLY warm while you monitor the level in the overflow tank. Keep the fluid level on the cold mark; when it stops falling fill to hot mark. Dispose of your coolant in a environmentally safe way. Clean up; You're done.