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.
TIA, Shane