Car starting overheating tonight, got up to 220 degrees at a stop. Coolant fanes not turning on, drove with a/c all night (delivering pizza's one night a week for xtra cash) and was ok with a/c on. So I know the fans work.

I swapped around all cooling fan fuses/relays with others that work fine. No change.



So does this mean my coolant temp sensor is bad? If so how can I check it? And on a 07 2.2L Where is it located?


Any help appreciated!!

 

220 isnt quite overheating. at 221, fans only come on at 50% power on the lsj. i imagine its similar on the 2.2

but if it bothers you, anytime you hit come to a stop, just turn the knob on the ac. the ac doesnt even have to be on, just turn the knob and itll stay at the normal operating temp like your cruising.

do you know for a fact that the fans dont come on at all?

 

220 is NORMAL temp. If fans come on when AC is on then you should be fine.

Ive had the car up to 248* around the track and it was just fine. And cruising around at 230* when the fan burnt out on me.

 

yeh GM 4 cylinders run exceptionally hot compared to other car's, stock fans on my 2.4 only kick on at 227*.

 

Just had someone tell me it should never get above 210 degrees and the car is definitely overheating last night. Guess they were wrong.

 

i personally dont like the "idea" of going over 212, just because its the boiling temp of water, however, coolant boils at higher temps anyways and i believe it helps that the system is pressurized. but whatever.

but some new cars are set to run that all the time. like the cruze runs 220* for efficiency i believe

 

I agree with that person lol but its not overheating. I have two cobalts here at my house and they both behave the same way. First time I saw my car get up past 210 i panicked immediately, so I know what your feeling. My honda used to run consistently between 180-190 even in the hottest weather.

You would be correct, pressurization of the cooling system increases the boiling point of the water.

 

what temp should the fans kick on then? I believe 221 degrees was the highest with no fan at all. That's why I panicked.

 

mine turned on at 227* and didnt turn off until it got below 190*