Pontiac G6 overheating issues
Ok this one has been a project. I bought it off a used lot As-Is about 6yrs ago. Upon the 40min freeway drive home it blew up. Overheated, warped a head, all the fun stuff. Dealership did nothing, if i wanted to tow it to them they would diagnose. No help in getting anything back, just a mess. So it sat dead until i got the time and made it a project with my son.
In the last month we've replaced the motor. Runs well but still was overheating
Initial step was replace the thermostat. Still issue. Found the return line to the reservoir tank was clogged, the whole tank was a mess. New tank and supply line along with radiator flush. Burped the upper radiator hose and left cap off the purge tank.
Runs good about 200 degrees on a 10 minute idle. Found a small oil leak under pressure, oil filter was mangled somehow (i think wrestling the motor into place. This part was done while i was not observing) and was low on oil. So new filter and topped off.
Running it last night on the idle i seen the temp still climbing, fan kicked on. i did grab the upper hose and it was not hot or even remotely warm to the touch. Which leads me to questioning the newer amazon thermostat put in before the flush/new tank and all the rest. Should i replace it with another?
The radiator fan does kick in about 220. Only thing i haven't really done is leaving the cap loose door air to escape the purge tank, yet there's an overflow hose that i would think let's it breathe.
I question the water pump, but this is the newer used one that came with the rebuilt motor which is also on the other side of the motor from the cooler upper radiator hose.
I felt initially the clogged return line to the reservoir led to the initial overheating when i got the vehicle, but now I'm really lost. Newer motor. New (?) Thermostat, new reservoir and supply line, new oil filter.. what's left?