Hello and thank you in advance!
I have a 1999 Mercury Tracer with a 2.0 engine. 149,000 miles on the engine. Here is the trouble, it overheats at low driving speeds. My temp stays normal at idle in the driveway, normal at speeds of 35/45/55 or more. After about 10-15 minutes of driving around 25-30MPH though, the temp climbs steadily and approaches the red line. I checked my oil level and coolant level. Both of them appear to be fine. I have not noticed any leaks from the water pump area and cannot see any coolant in my driveway.
Could it be the thermostat is stuck closed? Air bubble in my coolant?
I have NOT pressure tested it yet, but I will be doing that this evening.
Any thoughts and advice are welcome!