History: A few months back I had a leak repaired in my cooling system. I noticed the other night that my radiator was nearly empty again, so I’ve filled it back up, but haven’t fixed it yet.
As summer is over, I no longer need my AC. However that caused me to notice that at its coolest setting, the vents are blowing warm air (maybe 15º warmer than outside) and that seems high to me.
My immediate thought is that the heater control valve may be leaking/damaged/corroded.
But I wanted a second opinion from you guys.