Hi

My daughter has a 1997 Hyundai 6 cylinder Sonata.

I am not familiar with these cars.

She needs the coolant changed which is not a problem but I don't know if it needs air to be bled out through some bleed valve, while topping up or not ?

I don't even know if it even has a bleed valve?

I have had a search and could not find anything.

Cheers and thanks.

 

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Anyone ?

 

Be careful when you ask for "Anyone?"
Cause I'll be here to give you enough bad advice on anything

Most cars have a thermostat which prevents the coolant from flowing when the engine is cold.
This means that when removing the coolant, it will not release all the coolant.
And that when refilling, it will not allow it to be filled to capcity
All while the engine is cold.

What I have done is to empty the coolant by removing the radiator drain plug and radiator cap.
Then to remove the thermostat or loosen up the housing of the thermostat or take off the lower radiator hose
Let it all drain
Replace the thermostat and housing, fill radiator with coolant. start engine and keep filling radiator as needed.
This means waiting for the engine to get hot enough to open the thermostat and fill radiator
When it opens, the coolant pump will circulate the fluids. Check the fluid level
Sometimes the radiator fan will turn on as an indication the coolant has reached temperature for the thermostat to open (not always)
Keep filling. Close radiator cap. Put some coolant into overflow bottle to the hot level indicator.
This fluid in the overflow bottle will be pulled into the system when the engine cools.


Good luck

 

You're likely done by now ... Y3 radiator and engine is easy to fill. There's only a drain plug at radiator bottom. Fill thru radiator cap while idling just until you can't get any more coolant in.