I didn't remove anything from the radiator support only from the air box filter tray and I just drilled a bunch of holes.

 

I put a new coolant sensor in from ACDelco just incase, bled the system then took it out. Its 90* outside, With the AC on max and highest fan speed I'm between 230 and 240 and on the highway, 250 and up.... I'm unsure what's wrong.

 

Your sure the electric fans are running and that your water pump and thermostat are in good working order?

 

Also does the heater work and if not it could be that you have a clogged heater core and that can cause overheating also.

 

Also the steam vent between the cylinder heads. Is this hooked up and is there a hose running to the radiator? Just throwing some things out there that can also cause overheating.

 

Also have you inspected the crossover steam tube to make sure there's not an obstruction. Was coolant always used or did someone just run water and rust the hell out of everything and now you have a clog somewhere.

Okay I'm done now....

 

Heater still works although I imagine it's still the original heater core.

Steam port is connected from the steam vent above the Water Pump to the Steam port on the radiator. I left the steam port hose disconnected from the radiator for a solid ten minutes while bleeding but all I got was constant flow. I reconnected it and bled from the radiator just to be safe. Coolant didnt burp or do anything strange, stayed level...

Thermostat I believe is okay as well but I will replace it anyway tomorrow. Fans are definitely working. The AC guy verified that for me.

i have also shaved the braces for the trans cooler.

The only things I havent done yet are replace the radiator support (still waiting for it to arrive) and relocate the trans cooler. I'm not 100% sure where to relocate it either.

I'm highly thinking of running the trans cooler line in a loop after the radiator and removing the cooler altogether to see what happens for one drive. Thing that worries me is I'm running a stall and don't want to hurt the trans by doing that.

 

I wouldnt worry about your transcooler , unless its about the supports blocking to much airflow. The trans oil will be under 180degrees .so wont be the culprit
When the cars warmed up is there pressure in radiator hoses? With car warmed up and radiator cap off can you see water circulating ? if hoses have pressure, jack the front of the car as high as you can and do your bleed procedure again. Run without thermostat Test drive. If not fixed id pull heads coz if waters circulating and if its bleed properly it has to be hard gaskets or cracked head

 

It seems to be circulating, I can see steam coming out of it when the thermostat opens and the motor gets warm. I'm going to run it tomorrow completely without a thermostat to see what happens. It may be a cracked head or head gasket but what is weird is it was also doing this with the LS1.

 

With radiator cap on do the radiator pipes have pressure? Do you see coolant flowing thru radiator with cap off?
If same ls1 was the same then cant be heads or gaskets... Jack front of car as high as you can then do another bleed to make sure thats not causing it.
Did you put a new radiator cap on?

 

Yeah. I replaced the radiator cap when I got the radiator. I'm going to video bleeding it and testing the hoses tomorrow. I have a new thermostat. I kind of want to put that in before bleeding it while the motor is still cool

 

another way to bleed is get a plastic bottle and cut the bottom off, a rubber oring around bottle top that will seal up with the radiator neck.... fill tht to the top , run engine . pretty simple and easy...

 

Went and jacked it up and re-bled. There was more air in the system. I also removed the trans cooler for the time being to see if it runs cooler. Im idling now at 194 - 195. Prior I was idling at 210 - 215. Going to take it for a drive.

 

Sounds as tho you may be onto it... in for results

 

20 degree drop is good results!

 

Unfortunately it still overheated with the A/C on, even with the external trans cooler completely removed from the car and bleeding the system again. .. ..the only thing I havent touched was the thermostat at this point.
Outside temp ranged from 88 to 91*F

Video of me bleeding the system: (note the digital readout for the water temperature is my real coolant temp)

With A/C on 3rd and 4th setting:
Speeds between 0 - 45 MPH car ranged between 220 and 235
Speeds between 45 - 70 MPH car ranged between 235 and 245
Speeds 70 - 80 - Temps gradually climb to 250 and higher

With A/C off
Speeds between 0 - 45 MPH car ranged between 195 and 215
Speeds between 45 - 70 MPH car ranged between 215 and 225
Speeds between 70 - 80 MPH car ranged between 230 and 240

Running the Heat max setting (painfully I might add)
Speeds between 70 - 80 MPH car ranged between 215 and 225

Im going to change the thermostat when it cools off. I have a new 160* thermo sitting in the garage I can swap in.

Alittle back history on the A/C - Back when I had the LS1, the A/C on this car used to be finicky as hell. It wouldn't blow cold even when fully charged. It turned out the system was over pressurized and the pressure release valve would stick open, the condensor would overheat and add to my overheating problems. An A/C guy fixed it for me here in Austin and it blew cold and became somewhat drivable in the summer. After the swap I ran into the same problem and he fixed it, only this time its blowing cold but Im still overheating where as prior to, it was blowing hot while also overheating.

Is there any chance that maybe my old heater hoses, or heater core in some way could be causing this?

 

Replaced the thermostat with a 160 thermo, also my radiator support comes later today. going to drop it off at LSX Power Tuning a bit later today as well.

 

looking at your video and it doesnt look like the coolant is circulating. Theres definitely no movement at around 11min 20second. So with the radiator cap on does the coolant pipe to radiator have pressure????
Your heater hoses wont be the cause, the cause looks like no coolant is circulating thru radiator... Interested to see if thermostat will fix the prob

 

Replaced thermostat. When I went to bleed, She was NOT agreeable at ALL. It turned into a full all out faucet just scouring coolant all over my garage, like literally NOTHING was left untouched. I tried through the steam vent which at first looked like a milky froth then turned into a faucet that flooded my garage floor with coolant. Had to garden hose my entire garage. I was forced to put the cap on, bring it to operating temps, let it cool down, top off.. ..redo the process. When it finally leveled off, it stopped spewing coolant everywhere and idled at about 175 - 180*... going to take it for a drive as soon as I wash all the coolant off of it. In all, I wasted 4 Gallons of Antifreeze trying to bleed it.

I'm worried they may have put my old water pump on instead of my new AC Delco unit. I can't tell for sure because both units were new. I was skeptical of my old water pump however.

 

No you have coolant circulating lol.... I think youve found the problem