if you didn't fill it properly, it could happen.How would air get trapped?
yeah, OP's car should be running like total crap if that's the case.Check the wiring. -39C means open circuit I believe. Fix it before you foul out your plugs and o2 sensors.
Was the clip not in or the actual clip needed replacement? Just broke mine off with the header install so I'm scheduled to do this over the weekend with the restIt ended up being the coolant temperature sensor connector for anyone who might have a similar problem.
I want to share my experiences from this morning with the dreaded air bubble so that maybe it will save someone else the grief I went through.if you didn't fill it properly, it could happen.
if you have an 04 it's less likely with the surge tank setup. i guess it seems to happen more frequently with the 05/06 coolant setup to not have a complete fill and have an air pocket somewhere. you may notice that checking the radiator after running the engnie it will be low, perhaps even significantly low, even though you swore you topped it off when you filled it.
i would fill it from the radiator, engine cold, with the engine running. wait for the thermostat to open, then top it off. it can help to have the front end raised slightly. if you have an 04, do the same process i guess, just fill it from the surge tank.
with a properly filled cooling system, you should get better cooling and your temps might drop.