What would cause my fans not to kick on when my car gets hot?? on 2007 Pontiac Grand Prix

My main belt broke and I was told it was due to my water pump going out causing it to lock up. I changed the water pump and belt but now my car runs hot sometimes and I've noticed the fans aren't kicking on unless u have the air on. Would this some how be connect or am I looking at more than one problem??

by in Potwin, KS on November 13, 2012
3 answers
ANSWER by on November 13, 2012
Make SURE the system is FULL of coolant. Run engine with AC off until fans come on or it shows it is hot. May take 30 min. Did it run hot when sitting and running before?
ANSWER by on November 14, 2012
could be coolant sensor or relay issues or low on coolant
ANSWER by on November 15, 2012
Switch/sensor still unplugged? A/C may control fans seperately.