2006 Cobalt SS 2.0 Im having a severe overheating problem, my car is shutting off while im driving at approx 160 to 180 degrees! I just replaced the PCM and the MAF sensor... anybody have any idea what could be causing this? I have noticed that the antifreeze has ran into the overflow container

 

160-180 is "cold" you have something else going on. is there a Check Engine Light on?

 

I was going to say... cause my car runs at 220 degrees on long drives without overheating..

 

wish my car ran at 160!!! its hot!!! im cruzing at 185 190! stupid summer sapping away my sc power.... I feel like superman around kryptonite

 

What over flow container?

 

My car runs regularly between 178-200 while on the freeway. Ive gotten up to 220 sometimes in city traffic but it always cools quick.

 

Just letting you know the engine coolant and after cooler systems are totally separate.

 

sounds like you have a different problem temp isent it

180 isent cold i would like to see some 160 temps

yours is running to hot being at 220 it should run 180 to 190

yours is normal op temp

 

[QUOTE=mrbelvedere;6555735

180 isent cold i would like to see some 160 temps

[/QUOTE]

If its not "Cold" then why is everyones Eco running hotter than 180, cause its "Cold" in terms of where it should be.

If you want 160 Change the T-Stat

 

220 is not abnormal on scorching day. fan will keep up with that. Cruising should be 185-190.

No need to go to a lower T-stat on these cars. They aren't designed for it and will hate it.

They like to be fully warm.

 

mine has run 180 since it was bought new no matter how hot it is out i have a 160 to put in

actually 220 is an abnormal temp on an lsj if it is running that high while cruising there is a problem

saying the engine isent designed for a 160 is incorrect the engine is tuned around a 180 all that you need to do to run a 160 is very minimal tuning change

 

220 is normal at idle....low speed fans won't even turn on until 223. While moving, it should be cooler than that though.

 

Is your thermostat stuck? That would be why it is it is cooler temps and it is going back into the over flow.

 

Is the op talking about engine coolant or intercooling system?

 

ok. so im new on here dont know anything really. my cobalt isnt anything special its a stock lt 2.2 ecotech. its been running hot here lately and i have replaced my radiator 1) it had a crack in it. i have also replaced my water pump fans are coming on at 211 but its not helping. i have replaced the thermo multiple times. the only other option is flushing the coolant system if ant advice please help me!!!! its getting up to 145 then i shut it off because im affraid of hurting it lol

 

Well if your shuting the car off at 145 your not even letting it warm up all they way. So I'm going to guess that's a typo and say your shutting it off at 245. If so then you might have a cracked head , warped head, or blown head gasket, since it sounds like you replaced every thing els

 

yeah typo sorry... well that is another thing i had checked and it passed the pressure check and some other test. i mean i hve tried almost everything. if i stay at a constant speed it will cool down to like 210. it overheats when i accelerate runs fine in idle. i mean i have never had a problem like that.

 

you should check and make sure your water pump is turning....seen a few ecotecs at work that have the water pump/balance shaft chain fail.......if you look on the side of the motor with the belt, you will see a little plate held on by 4 bolts......take the place off and start the engine, see if the water pump is turning.


But if it did overheat.......there is a chance you could of warped the head/blown the head gasket.....and it might not show up under a pressure test. The best way to tell is to get a block tester and see what happens. The block tester uses a blue liquid, and almost a turkey baster looking tube. Napa or any place should have one.

 

well i went to a autoshop and they used the block tester and it passed. i mean could it be my coolant? bc i mean obviously the coolant isnt circulating very good or at all. i mean have a coolant flush done?

 

ok, well if it passed the block test.......go and check the water pump like I stated above. If the pump isn't turning, coolant isn't moving.

 

alright thanks for the advice i mean you have been the only person who has gave me an answer instead of checking everything i have already done.

 

Make sure your tstat wasn't put in backwards.

 

The AC compressor turns off when you go WOT. Maybe your getting heat soaked

 

If you replaced the radiator, maybe there is a very large air lock in your cooling system that is not allowing it to flow right. I know after my engine build when I filled the coolant back up, I only got like 4 quarts in instead of the recommended like 6.8 or something like that. Just had a lot of air in the system that needed bled. I found an easy way to do that was to put a vacuum bleeder on the nipple on the head that leads to the over flow tank. Bled it out, filled it up the rest of the way with coolant and that fixed my issue. Maybe worth a shot for you.

 

Thanks. Since my car is a lt can I do anything for more power torque etc? I wanna swap to a 2.0 but was told was a waste of money because of how much it would cost