fuse 20 air con always blown on e30 m40 318i engine

[markus_74]

hello, after a few times go to local air con shop without any progress, I hope this forum can help me.

it begin with my air con compressor sometimes die when I hit hole and after I take my ac compressor relay and put it again then the compressor turn on again.

I try to knock my air con relay to fix it, and it operate normally for a week until my fuse 20 blown when I hit hole.

I try to replace my fuse 20 and it can operate normally until a few days I hit a hole and fuse blown.

I replace it with new fuse but it only stay for 1 hour, and then when I replace the fuse it suddently blown, I try with 3 replacement and it suddently blown withoud delay.

but If I try to put another fuse the day after it, it can be turn on but after a few minutes it will blown again.

So far my mechanics have made new cable route from battery to extra fan and install new independent fuse, but the fuse 20 still blown.

also my mechanics try to check to turn on my compressor solenoid directly and it seem working normally.

Fuse 20 Stop blown until now when my mechanics cut the purple with black strip cable behind the AC switch.

But after he cut it my idle up/ICV die so my car have tremor when it stop.

he also said that my brown with red cable below AC relay that should be earthed is contaminate with positive current.

what should I do? I want to re connect my purple with black cable to turn on my idle up/ICV so all become original again, but I'm afraid my fuse 20 will blown again.

is it my compressor solenoid? extra fan? AC switch or any cable that is leakage and hit body?

any help will be very appreciate for my mechanics input