cooling fans

[jagrjones]

My car is overheating, coolent is boiling. Are both the fans supposed to run at once? One of mine (driver side fan) dosen't run when the other one does, any suggestions?

-Jagr

 

[Bigpav7]

only one fan is supposed to run. the other one is for the A/C.

 

[jagrjones]

Ok, so, my car has adequate coolent, fan works, car is actually overheating, coolent is boiling. I know this could be from several things, what are the most common reasons that a 1gdsm will overheat?

-Jagr Jones

 

[Beemer]

Thermostat. Crack in radiator top. Blown head gasket. I have seen thermostats actually fall apart and come out in 2 pieces. At idle from a cold start, watch the coolant as the thermostat opens and the upper hose gets hot. lots of air bubbles = bad head gasket. A volcano = definitely bad head gasket