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br. Truls Vatne
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There are a few things that could be preventing your compressor from engaging.
It could be a bad high pressure switch. This is located on the back of the compressor and completes a circuit when there is enough refrigerant pressure in the system. If this switch is bad then the compressor won't engage. You can try jumping across the switch terminals and then see if the compressor will engage.
There may also be a temperature sensor on the expansion valve, the block where the a/c lines attach at the firewall. This temperature sensor can prevent the compressor from engaging.
It could be the compressor relay. You could try replacing the relay with another and see if it will then engage.
It could be the control on the dash.
It could also be a wiring problem between any of the components.
The problem could be the compressor clutch coil also. It is possible that the rest of the system could be functioning normally and the compressor is actually being powered but not engaging. You can use a test light to check for power at the compressor with the engine running and a/c on, if there is power and ground at the compressor but it won't engage then the problem is the clutch coil.