Ever since I changed my coolant on my 2001 Honda Prelude 2 months ago, the coolant heats up fine and temperature stabilizes at a bit below mid-point on the stock temperature gauge. Yet when I stop and let my car idle for about 2 minutes, the coolant temperature needle drops about 2mm down. After I start driving again, the temp needle goes back to normal. The car runs very well, the engine seems smoother than when new. There's no coolant leak as I'm not losing any, and there's no coolant contamination in the oil. The coolant is premixed Honda coolant that I bought from the dealership, and I did the fluid change myself so I know what I put in.
Would that mean that I have some air bubbles in the coolant, or is there something wrong with the thermostat?
Would that mean that I have some air bubbles in the coolant, or is there something wrong with the thermostat?