So i noticed the water in the expansion bottle rising kinda high and releasing itself from the pressure cap untill the fan kicks in and then it sucks the water back down to below the max line in the bottle , also noticed a small leak from behind the water union just under the coil pack , is this likley to be the water union itself leaking ? or something else hidden behind there , with out remving everything its a bit awkwards to see where its coming from .Any body had the same or simular issue's ? if so what was the remedy ? or should i replace the water union as good measure and take it from there ? Also wondering if this leak could be the possible cause of the water issue, like sucking in air or something ?


Thanx in advance for your reply's