07 cobalt LS 2.2 overheating problems
07 cobalt LS 2.2 overheats, replaced thermostat ,
radiator ( twice) drilled 2 holes in thermostat,
replaced head gasket ( coolant in oil , which is when
all this started ) I had a 50/50 ( yea right !! Because
it froze right after I did head gasket) from there on
out it gets 230 at 55 mph and anything above that
will send it over 250 .. please anyone that can help
???
Problem found .. after removing the water pump I was amazed that at first appearance nothing was wrong .. wasn’t leaking , making noise , no rattiling , no broken or missing impeller.. I spun the sprocket side and impeller spun .. my heart sank .. then ( for reasons unknown to me still) I stuck my thumb in the impeller and held impeller while I spun the sprocket side.. it held and the shaft was able to spin without the impeller moving .. quite freely.. I put new water pump in and got on 75 nb today for bout 45 miles it never got over 160* .. problem solved !! Something I should’ve mentioned in original post is when I said it froze it got slushy so it wasn’t froze completely solid and that was -5* f out without windchill in northern Michigan.. thanks for the responses and the help !!!
K9tool I think I have the same problem with the 06 colbolt 22 I just bought it starts and I hear like a tapping on the back of the motor all most likely its coming from the headers but all most to the side now the guy I got it off of said that it's running hot and It needs a waterpump I just hope that is all it needs cuz I wasn't sure if it would need a new exhaust system to get it to Quite it up and I was just hoping any one would help me out with what they think
