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cooling system

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90

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ronnie

cooling system

Post by ronnie »

how can i remove air trapped in in cooling system

LaRy
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Joined: 15 January 2004
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Post by LaRy »

Usually it is no problem with air trapped in the cooling system. Adjust to maximum heat, so no air can be trapped in the cabin radiator.
My solution is to press the upper radiator hose rapidly with my hands so it is getting compressed. It is rather soft and long, so it is no problem. The system is "breathing", and you can acually see how air is coming out in the resevoir. I use to do first without running the engine while filling the system with coolant + water and continue to do it also with running warm engine. I do it normally 10 times when cold and 10 times when engine is warm. In this way you get all the air out from the cooling system.

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