On my way to work today, I could only get cold air to come out of the vents despite having the heat selected. Then on the way home, the engine temp went into the red and the fan turned on despite the fact that it was about 40 degrees outside.
I thought it might be the thermostat, so I picked up a replacement but when I went to change it out and did not see any tell tale signs of failure. I went ahead and changed it out anyway and took it out for a quick test drive, still nothing but cold air out of the vents but the outside temperature was down around the 20's by then.
Any ideas?
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