usafstud

Hi,

I just got done with a track day and on my way home, I notice the coolant bars were at 2 bars. According to the scan gauge, I was 150-155 F with open road ahead of me with ambient temps in low-mid 70s. I just put in a koyo radiator, distilled water with water wetter before the event. The car was running around 205 on track a couples of time I checked during warm up lap. I didn't have any issues on the way to the track. I reset the ecu by unplugging the battery and it didn't help.

Any advice on what to do?

It is AP1.

B serious

Maybe your thermostat failed coincidentally.

s2000Junky

Yeah either thermostat stuck open or your sensor/unit is not reading correctly. Not sure what else it could be.

spdracerut

Hmmm..... well, the 205F is probably just because there was still air in the system. It's a royal pain to get all the air out. As for the 150F while cruising...... well, either the thermostat is stuck. Or you have an air bubble where the coolant temp sensor is located, so there's still a lot of air left in the system and the coolant sensor is touching coolant.