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Coolant Drain - Who's got the double secret password? S90-V90 1998

Tried changing 'all' the coolant in the S90 recently. Took the cap off the reservoir, opened the petcock on the bottom of the radiator, took the thermostat out(replaced) and opened the brass valve on the metal pipe coming out of the bottom front of the engine (only a few drops came out of this line)and I still only got about 'half' the coolant out.

What's the secret to getting all the coolant out? Does the fact that only a few drops came out of the brass valve mean the valve is plugged? The coolant that did come out looked in good shape with absolutely no debris. I'd be surprised if the valve had debris in it.

Any thoughts are appreciated.

DEWFPO

--
1998 S90 070,350 and 1995 964 153,650






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