2012 Duramax no heat
A few weeks ago I had no heat on the highway. Drove over 300 miles and Luke warm. Engine temp gauge looked normal. Diagnostics scan showed a code that dealer told to change the thermostat. After finding 2 thermostats I changed both, flushed the whole system that was only 3 years old with 70k miles.
Now engine temp gauge looks higher. We have some heat for short distances. Get on the highway and it goes cold. Turn up the temp, immediate heat comes out. But not for long. Turn down the temp it goes cold. I don’t get it? What do I look at next?
Now engine temp gauge looks higher. We have some heat for short distances. Get on the highway and it goes cold. Turn up the temp, immediate heat comes out. But not for long. Turn down the temp it goes cold. I don’t get it? What do I look at next?
