Originally Posted by torzetec02
I tried to use a OBDII reader to get the real temperature, but could not find it.
Guess you don't know about odometer test mode. Just hold in the trip odometer reset button while you start the car and hold it in until the odometer display reads "TEST". Repeatedly push the button and you scroll through various datastreams that the cars computers look at. Most are gibberish but there is a temp display one that reads in celsius, it'll just be a couple digits and then a C. You can use this to see what the thermostat is doing.
I agree with amc49 though, sounds like the thermostat is sticking open.
changed the thermosta and bled cooling system yesterday, back to normal now. I tested the temperature before the change, it stayed round 70-73C,depend on how fast I drove.
I put the OEM thermostat in hot water, it can open and close. I highly suspect that the system has air pocket inside since last time the plastic tube on top of the rad broken two months ago. after replacing the tube, I just bled for about 5 minutes, probably that was too short.