Whats wrong with the A/C in my 1999 Pontiac Bonneville SSE ?

call or notify a bone/junk yard they have the cross reference charts for vehicle parts or try a gm dealer these are a few that are compatible 97-99 Pontiac Bonneville SE 6Cyl 3.8L 231CID VIN K Fit Note Engine VIN: K, Naturally Aspirated 97-99 Pontiac Bonneville SSE 6Cyl 3.8L 231CID VIN K Fit Note Engine VIN: K, Naturally Aspirated 98-99 Buick LeSabre ALL ALL 97 Buick LeSabre ALL ALL Fit Note With Harness Codes: HEN, HER 97-99 Oldsmobile 88 ALL ALL 97-99 Oldsmobile LSS ALL ALL Fit Note Engine VIN: K, Naturally Aspirated 97-98 Oldsmobile Regency ALL ALL

Hi Brandon, try the following link.
Trust this helps, regards Alan
http://www.pontiacbonnevilleclub.com/forum/1992/topic29244.html

Hey Carlton, you can find most of what your looking for at autozone library its all free and no spam but your first choise should be to go buy an auto repair manual for 20.00 its all very well spent and you'll have a great reference materal .

this is usually due to the switch wearing out, replace switch or remove switch and put jumper wire straight from 12 volt supply to the high terminal, if you prefer to have high, switch is typically 12 dollars and easy to replace.

Low of fluid

So the blower doesn't blow at any speed?

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

YOU NEED TO REPLACE INSTRUMENTAL PANEL - HAD THE SAME PROBLEM WITH MY 1989 SSE- TAKE THE COMPASS AND DIC OUT OF OLD PANEL PARTS ARE PROBABLY STILL GOOD

have you check the shifter linkage

yes there are fuses but there will be other instruments running off the same fuse! If everthing else seems to be fine than i would go directly to the blower located on the fire wall and change it!

The a/c compressor will only turn on if it is full of refidgerant and presure levels aren't too high on the back side of the compressor. Check these first. Only use the appropriate type ie, r-12 or r-134 unless it has been flushed and retofitted.