Removed my seat yesterday to blow out underneath the gas tank. Not sure if I can coat or paint it with anything but no leaks on that yet. Before doing this I went for a short drive 10 minutes or so. Initially after I started it I had a little moisture aerosolized coming out the heater vents. It lasted 5 minutes or so. No wetness noticed inside of heater case but through the vents, I see core may have a small leak. Any way went for short ride after the cleaning. Working some on freeing up floor pan also.
Glen
1946 Chevy Truck 216 1/2 ton "Tales from a weekend mechanic" Follow in the DITY