Hello,
depends here on the size of the antifreeze container- if it is the Penta liquid it's slightly less than 2qt. The Volvo liquid is 3.78 liters, so you may not be using a full two gallons.
The recommended fill for my '89 740 Sedan and '91 940 Sedan is 7 liters.
It works out to be about that when I change the fluids. Have to be aware too that the engine has to "burp" since there is always an air pocket in the block. I drive the car about 3/4 miles and then check the expansion tank. If it's empty I just add about another liter and it remains constant for a while. I add liquid about every two weeks if I drive distance. I always use distilled water, because tap water has mineral in it that can cause electrolysis in the block, aluminum or metal.

Hoe this helps.


Volvosenior (Art)
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89-740 GLE;91-940 Sedan ;98-V90 Wagon ___ all running well

Same here. Always a litre/quart or two less than spec no matter how well it seems to be drained. So I always put in half of the claimed capacity using pure antifreeze. then top up with water. After a lot of heat/cooldown cycles a test shows the mix is only slightly above 50%. So either the capacity spec is wrong or those missing litres are well hidden.
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Bob: Son's XC70, my 83 240, 89 745 (V8) and S90. Also '77 MGB and some old motorcycles

Maybe it's due to a smaller-capacity aluminum radiator? That's my only guess. I remember needing more than 2 gallons for my 740, but I could be wrong.

Yes, I've always wondered where those two quarts were hiding.
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Art Benstein near Baltimore

The roundest knight at King Arthur's round table was Sir Cumference.

I always experience similar on my coolant changes. What you added was 50/50 so you're good.

If I am changing just to change coolant, I drain and fill with water. I let it mix, drain one more time then add 5 quarts of pure coolant and fill the rest with water.
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Paul NW Indiana '89 744 Turbo 175K/ '90 745 turbo 145K