Volvo

 

The engine has not gotten hot enough yet - those come on at about 225 degrees. Put a piece of cardboard in front of the radiator (temporarily) to force the engine hotter - if the fan motor, switch, relay and fuse are good - it will come on about 220-230 degrees.

 

Use a zip tie tied through the radiator and a new grommet to keep the fan switches from popping out - A healthy cooling system with proper mixture and good cap raises the boiling point up to about 250 degrees.

 

If you have a thermal switch in the radiator with two wires (on or off is all that switch does), a black relay, and an electric fan motor - there is only one speed - and there is not a controller to limit the speed to low or high - there are plenty of later Volvos that do that.

Later 940s use a temp sender in the cylinder head to control the fan - perhaps Mr.Chilton is referring to that. Those 940s do not have a belt driven fan (use the same water pump and pulley, w/ no fan attached) - just an electric one behind that radiator (rather than in front)

 

1991 Turbo, with mechanical fan and 1-speed electric fan that only runs with the air conditioner...


1992 turbo with no mechanical fan, and 2-speed electric fan... these have a larger radiator, too.