I was getting onto the interstate in my 96 v6 Mustang and pressed the excelleration to get in front of some traffic and the rpm’s was up to abut 4. I had the heater on level 3 of 4 and when I accelerated the heat went from warm to completly cool. I drove going 75 mph on cruise and the air was still cold and then I noticed my guage go from cold to medium, then I saw it going up to hot and I have never seen it do that. I slowed down to about 60 and was driving for another mile and it stayed on hot. Then I turned off the heat and the temp guage immediatley dropped back down. I drove for a few miles without the heater on and then turned it back on and when I turned the heater back on it was working fine again.
This has never happened before and I assume something needs to be done. I didn’t want to spend an arm and a leg taking it to a mechanic if it is something simple the car may need.
Any suggestions?
Thanks!