one fan is kicking on when car heats up, the other never does. if hooked direct the car will run at about 230 when its like 90 degrees out. if not, with just the one fan it heats to like 250 FAST!!!! should 2nd fan also be kicking on??
this will only happen while driving, i can let it run all day and the one fan will kick on and cool it right down if it gets 2 hot, but not while driving. any advise......anybody.........??

 

what kind of car are we talking??

sounds to me like you have a clogged radiator, bad waterpump or alot of air in the system

 

sorry, 89 iroc 350 5.7