Door Open Light and Alarm Intermittent

Hi All,

I've got a 2003 Rover 75 SE 1.8 Petrol with 80k miles on it, and while it's a solid car to drive (no head gasket problems thankfully) I appear to be having a couple of issues with the electricity and one issue with cooling.

It went in for it's MOT but the test was "abandoned" as it appeared to have overheated and dumped water all over the garage. Towed home, checked all over and while it appeared to be wet on the underside and dripping (has always done this, suspected air con perhaps?), I couldn't find a problem. Put some water in, started it up and ran it for 3 hours watching the temperature. The fan kicks in at 100-110'c and always cools back down, no problem. We did notice some copper particles in the coolant which we thought may be from a dodgy repair (rad weld type stuff) by the previous owner. Just curious if anyone else has had similar issues?

Now the main issue:

The alarm goes off at random intervals, can be fine for a week then goes off 4 times in a day. Thought it may be temperature related but it's done it in freezing rain and a warm day. In relation to this, the interior light often comes on of its own accord, which appears to be because the car thinks one of the doors is open. The door open light comes on randomly which can be quite distracting while driving, and I can't seem to find any rhyme or reason as to why. We think this may be causing the alarm to go off, if it thinks the car is being broken into perhaps? Leaving the car unlocked stops the alarm going off but I don't like doing this, and the interior light still comes on.

The interior light has already drained the battery once which was rather annoying. The battery runs at 14.3V so I don't think that's the problem, was thinking low voltage could cause something to trip?

Now we have noticed that there is water in the wheel well in the boot, so water is getting in from somewhere. It looks like it is coming in from one of the wheel arches as the boot seals are all dry. The water has ran down and under the back seat, is there anything under here that could be tripping if it's shorting out or getting a bad ground? I have seen people say that adjusting the bonnet bump stops can help with this sort of issue however the car does it when stationary so it's not like the bonnet is lifting during driving.

Going to try and dry the car out when the weather gets a bit better but does anyone have any ideas of what else could be causing the problem?

Thanks in advance.

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Door Open Light and Alarm Intermittent