2000 bettle 2.0l alarm randomly goes off

See if your dome lights work when opening the door. Usually a door latch.

Possible the battery voltage is falling too quickly fooling the brain into thinking a door has been opened.

Worn, maladjusted or damaged door, bonnet or boot strikers or worn or damaged locks is another possible cause.

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I do not know how to "fix" the problem to make it right, but you can disable the alarm through the relay box or fuse box. You'll lose the alarm, but can lock the car. Several may be labeled "Alarm and... try to find one that is the alarm alone or something significant, if possible. Not an answer, just an Idea.

The alarm tripping is often caused by a bad door or hood switch. Since the hood switch is always exposed to water and corrosion, that one usually goes bad first. Check that out. And no, you can't disable it.

Get the hood switch checked. Have seen this problem several times.

open driver side door AND trunk, then start car, this disables the alarm

A/c heater control head, bad fan switch. ( I presume you are referring to the heater blower fan ,)

Locks need lubrication or replacement. You could try spaying WD40 down past the window when it's down into the lock area and into the key slot in the outer handle.

over sensitive sensor in the car could set it off randomly... bonnet boot, door handles.. one of the motion sensor thingiis, if fitted. the beeper issue could be the position of the incoming sensor of the alarm it self.. if it is an imboliser as well then there is whole other range of issue.. turn it off or at least disconnect the siren.. or you could just pay some one way too money to fix the problem for ya... good luck

the factory fit alarm is not voltage sensing .The best advice is to go to VW garage and get them to read the alarm causes,(they can check the last 4).this will give you a good idea where the fault lies.ie door lock mechanism,interior monitor etc..You cannot start looking for problem until you know alarm cause..