Cooling issue

[Ohdayumsayum]

So i had rust in my system and it seemed to clog everything up so i flushed the entire system and replaced the thermostat, water pump, coolant temp sensor, stock radiator to aluminum radiator and it still overheats. The upper radiator hose gets really pressurized and coolant gets pushed into the coolant reservoir. I know this is because my thermostat isnt opening but i cant figure out why. I also installed the thermostat with the valve ontop. The system was bled properly as well, jacking the car up, heater full blast, opening the bleeder valve as well. Can anyone help me? :(

[jza80king]

So i had rust in my system and it seemed to clog everything up so i flushed the entire system and replaced the thermostat, water pump, coolant temp sensor, stock radiator to aluminum radiator and it still overheats. The upper radiator hose gets really pressurized and coolant gets pushed into the coolant reservoir. I know this is because my thermostat isnt opening but i cant figure out why. I also installed the thermostat with the valve ontop. The system was bled properly as well, jacking the car up, heater full blast, opening the bleeder valve as well. Can anyone help me? :(

hmm have you tried taking the thermostat out and running it that way? So your lower radiator hose doesn't get hot I take it? That would be a sign of the thermostat not opening but you said you changed that.....what kind of thermostat? I have had a thermostat fail right after installation and I have had an OEM thermostat from Nissan fail as well where the little copper 'C' clamp broke off. If you take your newly installed thermostat out, test it by boiling water to 200 degrees or so and drop it in, watch to see if it opens or if it doesn't, this will tell you if it's a piece of shit or if it's truly working. Forgot to ask did you change the radiator hoses? Maybe the lower hose if blocked with gunk and shit?

[Ohdayumsayum]

hmm have you tried taking the thermostat out and running it that way? So your lower radiator hose doesn't get hot I take it? That would be a sign of the thermostat not opening but you said you changed that.....what kind of thermostat? I have had a thermostat fail right after installation and I have had an OEM thermostat from Nissan fail as well where the little copper 'C' clamp broke off. If you take your newly installed thermostat out, test it by boiling water to 200 degrees or so and drop it in, watch to see if it opens or if it doesn't, this will tell you if it's a piece of shit or if it's truly working. Forgot to ask did you change the radiator hoses? Maybe the lower hose if blocked with gunk and shit?

Yeah the lower hose is completely cold and the upper hose has a lot of pressure built up so without a doubt it's the thermostat. I have an OEM thermostat installed I'm gonna take it out this weekend and test it with the boiling method. I didn't change my radiator hoses but I did give them a good cleaning before I reinstalled them. I'm wondering if my thermostat isn't opening cause when I left it idling to warm up I don't think it went up to operating temperature. After idling and having everything up to bleed the system for about 45 minutes I checked the bleeder valve and it was dry, no air, no bubbles nor was there coolant coming out. iirc it should be bubbling and then it should be a steady flow of coolant coming out after air is bled completely no?

[jza80king]

Yes that is correct. You still have air then if thats the case. I know you bled the system and jacked up the front but sometimes these motors are a pain to get all the air bubbles out. Jack it back up high again, put jack stands for safety, put a funnel in the radiator spout (so remove the cap) and put coolant in the funnel about halfway. Run the car with the heat on full. I would also rev the motor to about 2500-3000 rpm after you have allowed the car to run for a good 10-15 mins. Any air will come out the funnel in form of bubbles and it should suck that coolant you put in the funnel. This is exactly how I bled my system.

[Ohdayumsayum]

Yes that is correct. You still have air then if thats the case. I know you bled the system and jacked up the front but sometimes these motors are a pain to get all the air bubbles out. Jack it back up high again, put jack stands for safety, put a funnel in the radiator spout (so remove the cap) and put coolant in the funnel about halfway. Run the car with the heat on full. I would also rev the motor to about 2500-3000 rpm after you have allowed the car to run for a good 10-15 mins. Any air will come out the funnel in form of bubbles and it should suck that coolant you put in the funnel. This is exactly how I bled my system.


Hmm, okay I will try that out this weekend!