It started running warmer than usual, just over 200. It takes longer to blow warm air by the heater than it used to, and after it does get warm it may turn cooler after a while. Today it started to get the the red area for temp and seems to lose some power. I shut it off as soon as I seen this and let it sit for ten minutes. Started it up, started fine, and the temp was back down to the 200 range. Got it home no problem. As I was driving in the city it did tend to warm up when driving slower. If I stepped on it going 40 it would drop in temp considerably. It does blow warmer from the drivers side more than the passenger. I did change that device under the glove compartment a year ago or more when it was doing the warmer on one side than the other then. The fans are working. The thermostat was changed maybe 1.5 yrs ago. It does not get driven much outside of winter. I have noticed it has been revving a little higher than normal over the last week. Once it did stall after I started it, but started fine since and never stalled again. As I parked it I did hear a somewhat of a small grinding noise from the right side of car near the water pump.
Would like to get thoughts one what this would be. Was thinking possibilities would be thermostat, water pump or head or head gasket problem. But does a water pump have anything to do with the heater being warm as it should be? Maybe if its not pumping good enough? What are you guys thoughts on that?