My 2002 monte ls is overheating and I do not know why. I have replaced my radiator fans, flushed my system, replaced my water pump, thermostat, and temp sensor. My mechanic said that my radiator was good. I have no idea what is causing this. It used to be only when my A/C was on, now it is all the time. If I turn the heat all the way up and put it on the option that is the opposite of recirculation then it kind of bleeds hot air off of the engine and cools it down. I cannot figure out what the problem is. Thanks for all the help guys. I love this board.

2002 Monte LS
99500 Miles
check engine light for crank shaft(that is what they told me last time i got my oil changed.)
runs wonderfully.
was told engine has intake leak.

 

did you bleed your system of air? if so, did that fix it temporarily? if it fixed it for a little bit, but then you started driving again and it overheated, stop and try to bleed it again. Is more air coming out?

Could have a head gasket problem, constantly forcing air into the cooling system. If you constantly have to bleed the system for air, this is a likely cause so you stop throwing money at it.

 

Sorry to be the bearerof bad news, but those 3.4's are known to have head gasket issues and this sounds like what you are battling, have a garage do a blue bulb check , to check for hydrocarbons in the antifreeze...