How much coolant?
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Joined: Jun 2024
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E320
If you're just draining from the radiator on the 2017 GLS450, you'll probably only get about 4 to 5 liters out, maybe a bit more if you tilt the front end up or blow out the system a bit. The total cooling system holds around 12.3 liters, but draining just the radiator won’t get all of it, since a good amount stays trapped in the block and heater core unless you use vacuum equipment or open block drains, which most folks don’t bother with unless they're doing a full flush.
If you’re only swapping the thermostat and topping up after, just grab 2 gallons of coolant (that’s about 7.5L) and you’ll be more than covered. Just make sure to get the right stuff—MB spec 325.6 (G48) or their own blue coolant. Worst case, you end up with some extra for topping off later.
If you’re only swapping the thermostat and topping up after, just grab 2 gallons of coolant (that’s about 7.5L) and you’ll be more than covered. Just make sure to get the right stuff—MB spec 325.6 (G48) or their own blue coolant. Worst case, you end up with some extra for topping off later.
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Joined: Feb 2025
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If you're just draining from the radiator on the 2017 GLS450, you'll probably only get about 4 to 5 liters out, maybe a bit more if you tilt the front end up or blow out the system a bit. The total cooling system holds around 12.3 liters, but draining just the radiator won’t get all of it, since a good amount stays trapped in the block and heater core unless you use vacuum equipment or open block drains, which most folks don’t bother with unless they're doing a full flush.
If you’re only swapping the thermostat and topping up after, just grab 2 gallons of coolant (that’s about 7.5L) and you’ll be more than covered. Just make sure to get the right stuff—MB spec 325.6 (G48) or their own blue coolant. Worst case, you end up with some extra for topping off later.
If you’re only swapping the thermostat and topping up after, just grab 2 gallons of coolant (that’s about 7.5L) and you’ll be more than covered. Just make sure to get the right stuff—MB spec 325.6 (G48) or their own blue coolant. Worst case, you end up with some extra for topping off later.
To get to the T-state I'll have to remove the intercooler, I'll have to drain that some how (is there a good way to do that on these? or just pop the lowest coolant hose on it and try to catch what I can with a pan underneath?)
Lastly, what's the best method to refill / burp that intercooler with out a vacuum system?
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