Hello I’m trying to help a friend with a 2000 Honda Passport with just over 150,000 miles… It’s been diagnosed as having a bad head gasket by a mechanic, although other then the overheating it’s not showing any signs. What I mean is that the oil is clean, there is no smoke, there is not extra pressure in the crank case or the radiator. Also, no bubbles in the radiator.
What it does do is run at a good temp at idle but as soon as you try to drive it (I did not make it two blocks) the temp spikes right away.
I also noticed the clutch fan is not pulling much air, but I was running the ac (so the condenser fan was on) and had the heat set to high…
Plus the radiator is new as well.
So how can I verify the head gasket is bad??