Where's the coolant mixing?

Injector cups. Even if the davco is a cold weather model with coolant flowing through it the coolant runs through the body of the filter. Unless the body cracked in that water jacket its impossible and that is even highly unlikely.

You probably do have coolant in your tanks,but you dont know it. The coolant as you know would be on the very bottom so short of pulling the plugs youd be oblivious.

If you dont get the injector cups fixed soon it will start drooling coolant out of your overflow and overheating.

 

To check if it is the Davco change your coolant, change the fuel filters then disconnect the supply of coolant going into the Davco. Drive the truck for a while, cheap easy way to figure out if it is davco. i have a D12 and have placed valves to switch off coolant supply to the Davco and only open them while the temp is below 10 F, so running without coolant passing through Davco should not be a problem. if it is the Davco i believe there is a part for repair. see link below. if not the Davco probably injector cups.

http://www.hhrvresource.com/sites/default/files/dfiles/DavcoFilter_1271.pdf

 

even if you by pass davco your cups are done they probably have holes thru them or not seating properly.

 

My problem with my D12 2006 Volvo is that water separator is filling up to top quickly so i change different filters pix every few weeks , i got no codes , no bubbles , any ideas

 

The lower the micron rating, the faster the fuel goes toward the top. When is the last time the fuel filters were changed on the side of the engine?

 

Try to use FS19729 50 micron had very good luck with volvos with this fitler this being said also need to check if tank are dirty if this is the case than need to clean tanks instead of always replacing filters.