98 LS 400 ac intermittenly shuts off. Sensor or fuse issues?

 

Low on charge? How long has this been happening? Could be a simple as a loose and/or worn belt.

 

I'd pop the hood and look for obvious first.
After that it's time to hook up a proper set of gauges showing low & high pressure if you want to know exactly what's going on.

 

A sight glass atop the accumulator/Dryer should have a slight green tint if refrigerant is present and no bubbles.




The negative battery ground cable terminates at a "stay" affixed to the AC compressor.

Oftentimes the stay and related hardware are corroded. Worth replacing.

Check all other grounds.

While at it, inspect the AC clutch bearing by removing the serpentine belt to determine if excessive play or noise.

Your cabin filter is present and not clogged?

Possibly a combination of issues.

 

I 2nd checking the grounds...

My heater used to surge whenever I come to a stop (because of the brake booster coming on dropping the voltage and letting the alternator "catch up") & after checking the grounds, I noticed corrosion and loose connections. Either clean up the grounds using a wire brush and some vinegar, or purchase new, shiny bolts for your grounds. I went the cheap route and sofar it has helped immensely.

 

Do an evacuate and recharge and you should be good to go. Sounds like its just low on R134a refrigerant

 

Do an AC self diagnosis check:

http://www.lexls.com/tutorials/air/accodes.html

IIRC, you use the same Auto and Recirculate buttons to do the self-check on a 1998. Report what code(s) you have.