I have a 98 Caravan. I usually charge my own AC, but I have never
tried on this vehicle. I can't figure out which port to use. I see 3.
One in the middle of the manifold by the dipstick, one on the lower
left of the engine, and one on the left fender. The one on the fender
is plastic and labeled Service Port. This seems to be the obvious
choice, but my adapter does not hold tight. The plastic seems weird.
Any ideas? My gauges clip on typically.