Can you tell me why air conditioner fuse keeps blowing?

Only way to tell if A/C Evaporator Core Orifice tube is plugged is by looking at A/C gauge readings , An if it is plugged you more then likely need a new compressor , they become plugged with metal particles from worn out compressor. Your best bet would be to take your vehicle to a qualified repair shop .

the clutch is shorted, buy a new one.
easy huh?
or the wire is shorted at the engine metal.
pick one.

20 is a lot and is probably right. Does it blow out when you use defrost or just heat? The reason I ask is because the air conditioner comes on when it is on defrost.

Start with fuse section of owner's manual. This will tell you where fuse box is located and which fuses are for each circuit.

it could be a fuse.
allthough it could be freon out or something wrong with the compressor or compressor clutch or maybe the belt is missing.

if the blower stopped blowing air then the blower motor fuse or blower motor itself has gone out.

look around in the paper for ac checks for free.
goto about 2 or 3 to be sure there telling you the same thing .
be sure to ask them to point and show and explain to you exactly whats the problem.
[email protected]
you can contact me with what they say and i can help you decide on whats right and whats wrong.
keep me posted
thank you
jm

check for system leacks (lines,fittingis,comperssor,dryer,condensor )

simply "adding a can"is a good way to end up with non-functional A/C. the typical system has high/low pressure switches that enable/disable the system. you need to be at the correct volume of refrigerant as specified on the sticker under the hood. i recommend using the proper equipment, evacuating, pulling a vacuum, and then refilling the system with the appropriate amount.

Three possibilities;
All related to blown fuses,

1- Fuse blown in the engine compartment LH.
2- Fuse blown in the cabin forward LH below the dashboard (below your legs left hand).
3- Fuse blown in the harness (wire bundles) below the dashboard very easy to reach with your hands “just look underneath steering wheel ".

U said " The air conditioner blows, but the air is not cold.
" Yes only the fan working which might receiving power independent all from those other mentioned things.
If all fuses OK. Then look for broken wires.

Regards;
MAR

there might be a problem in the electric circutiry! or check the generator / dynamo or perhaps, loose electric connections are causing the problem!!

If fuse keeps blowing that means that there is a shortage on AC wiring or switch controlling the air conditioner.

Also an abnormal power draw from AC caused by an internal fault on AC can cause the fuse to blow.
Test wiring and switch with a voltmeter, the most common is that there is a short to ground between wiring and car body somewere.