I have a 2001 Beetle that blows nothing but hot air and the compressor does not want to kick on. When the a/s is turned on, the car constantly spikes at about 500 rpms more than idle for a second and then goes back to normal idle. I took it to a shop to get it checked out, they claimed it being the relay under the battery and said it was good on freon. After reading similar problems with compressor not kicking on, we replaced the fan control module. It still did the same thing with the new one installed. Fans work, compressor doesn't as it does not seem to be getting any power. The fuses on top of the battery look good and do not look like they are melted in any way. Also, a clicking noise can be heard when the a/c is turned on. Could it be the pressure switches? What would be the next thing to check or do?