Coolant spills out the reservoir when I take the cap off in the morning. The temperature outside is about 90 degrees at 8 am. The spill isn't a lot but it is alarming, as I've never had this happen before. Also the car has been overheating lately, about once or twice a week. It'll over heat and run completely fine for the rest of the day. The temperature gauge will say 120 Celsius when overheating but i turn the car off and back on and the temperature will dip to about 85 Celsius in seconds. I just had the thermostat,water pump and radiator swapped out a month ago. Besides taking the lid off the coolant reservoir in the morning, the car shows no leaks. There is also no white smoke coming out the exhaust or milky substance on the oil cap. No idea what could cause the mild overheating.
My car has 95000 miles.
My car has an automatic transmission.
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