Fan only blows on low inside cabin. Where is the fuse for high side of fan?

Have you cleaned and flushed your cooling system? Mineral deposits can clog the system or form a barrier that reduces the cooling efficiency. The acids in the radiator flush cleaner will dissolve the mineral deposits and are then drained away and the system refilled with clean water to rinse it out. Then a mixture of water and coolant are put into the system.

Also, what does your coolant look like? Is it clear or is it cloudy or look like a melted milkshake? If it's not clear, you might be getting oil into the cooling system. This could be from a cracked block or a blown head gasket.

Did the dealer comment on the blower speed being low?

Possibly low on refrigerant. When system is low on freon, it does not build up enough high side pressure to engage the condenser fan . When pressure is high enough. a high side pressure switch kicks on the cond. fan to maintain high side pressure. Have the system evacuated and recharged to proper level.

Orfice tube could be clogged. Have the low and high side checked.

My air conditioner on my Buick has a full charge of Freon and when it is hot out I don't get the cooling power in the cabin as I have it on low switch so when I put the switch on the high the Air doesn't change to cool the interior on high. I had the Freon tested and it still doesn't work properly and I wonder if there is a sensor that doesn't allow the system to cool properly?

There are fuses for hi and low blower fan inside the interior fuse panels I know the high one is on the passenger side and believe the low is on the drivers side tho they may both be on the passenger side read the cover after you pull them off easy to find once you read the label if those are both good then its probably the blower resistor, fuse check first.

It sounds like your blower motor has died. This is pretty common for older Bonnevilles. I have a 2005 Bonny and replaced mine last year after 75,000 miles.
But first check your cabin filter. You may or may not have one. If you do, and it gets plugged up, you will get very low air flow. I had an Impala that get plugged with a mouse nest. If it's like mine, open the hood, and above the firewall on the passenger side and below the passenger wiper, is a cover labeled "air filtration system". It has a couple clips, remove it and look inside. It will be very obvious if you have a cabin filter. (I didn't have one) If there is no filter, you should be able to look down in the hole and see the white fan blades about 10-12 inches down. They should be spinning if the blower is on.
Not spinning? Next you should check the fuses. The fuses are probably under the back seat, but check your owner's manual.




If fuse looks OK. It's probably the blower fan.
The fan is under the dash on the passenger side... just about where the passengers left toe would be.
Remove the panel under the dash; probably a couple 7mm screws.
Unplug the fan. The center wire should have 12+volts.
Remove the rubber vent hose... kinda on the back of the motor.
Remove 3 screws. Probably 7mm. And the blower should come out.
I know my blower is different than yours, but they pretty much look the same.

u have a trinary type switch on the high side somewhere on the high side,,,it may have 2 or more wires going to it and it is mounted on the high side line/or compressor,this is ur problem

if the blower only blows on high then it is you blower motor resistor that is located behind the glove box it has two screws that hold it in place

replace blower motor resisteo located beside blower motor right side under dash has about five wires going to it.