Not sure what fuse controls rear AC but there s a relay specific to rear ac.heat only. It is in the fuse/relay box under the hood. Your manual should show the diagram. There are 3 similar relays in an L-shape on my 1999. the rear ac relay is the one at the base of the L-shape.
#6 fuse
Where is the fuse box on my 1999 c280 mb
Have you checked your liftgate fuse? In my 2006 Yukon, when the liftgate fuse went out the rear ac wouldn't work nor would the electric locks for the liftgate itself.
the AC fuse is located in the Swing down fuse panel under the headlight, rear window wiper, defroste switches in the E position. It is 10A fuse.
under the bonet
Blown fuse.
The AC does not blow on the main front vents. Only rear and defrost.
The AC low pressure port on a 1999 Buick Century is located on the side of the AC accumulator. This is positioned in the left, rear of the engine compartment.
its an expansion valve and it is located in the black box ( in the rear unit)
I have a 1999 ex v6 coupe which should be identical to yours. My manual says the AC fuse is located: Drivers side internal panel - AC clutch relay fuse #3 (which is the 3rd from the bottom. S/B a 7.5 amp fuse.)
could be a bad fuse or ac relay,also if out off coolant ac clutch will not work,
Did you check the fan?