under the dashboard a few inches to the LEFT of the steering column; while sitting in the driver's seat leaning forward you can just about reach it with the left arm extended and reaching all the way under the dash
On the accumulator.
Connect your Freon bottle to the low pressure port on your 1998 Chevy S 10 Blazer air conditioning compressor. Discharge the Freon into the compressor. A recharge kit will make this process quite simple.
on the evaporator / dryer
Into the low side service port.
The 1997 Chevrolet Blazer OBD 2 port is on lower edge of dash; right of parking brake
There are two schrader / port valves to the air conditioning system. One will be a high pressure and the other will be a low pressure. You need a certified mechanic to check and refill the system. You can not simply refill the system.
It is not port injection.I believe the fuel is injected into a throttle bottle.
The low pressure AC service port can be found on the side of the accumulator/receiver dryer.
left side below steering column
It will depend on the outside air temp, but 35 give or take 5 is a good place to start.
It doesn't have a test port. You have to fabricate fittings to tap into the fuel line at the fuel filter to connect a fuel pressure gauge. They probably sell a kit to do that but I made my own.
almost certainly not.Definitely not for a V6, as they switched to a split port in 1999 and I'm sure the 1998 computer isn't programmed for that.