On that design which doesn't have a bleed port or screw there is only one reliable way to fill it without trapping air in the system and that is to use a vacuum fill system. That goes onto the reservoir and pulls all of the air out of the empty cooling system, then you insert the fill hose into a container of the new coolant and open the valve. The vacuum inside the system then draws in the new coolant.
You can usually get that tool as a loaner from some parts stores, but you need an air compressor to use it as it uses the air to create the vacuum.
The DIY method takes a while. Start with a cold engine and the car parked with the front end up like on ramps or similar, fill the cooling system. Turn the heater on full hot, start the engine and let it run about 5 minutes, shut it off. Let it cool fully. Now top up the coolant and start it up. Let it run until fully warmed up. Shut it off and let it cool again. Check the coolant level and top up as needed. Now take it for a 10-15 minute drive and watch the temperature. Once this is done let it cool again and check the coolant level again. If it stays the same you are done. A few more drive cycles should eliminate any tint trapped bubbles.
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Sunday, February 7th, 2021 AT 4:25 AM
