? Do you mean the oil strainer, you just wash it, there isn't a replaceable filter as such ?
See page 39/40 for details http://www.g8dhe.net/bongo_images/gearbox/RC4AEL.pdf

The radiators have a metal to plastic seal at the top and the crimping of the metal to the plastic can fail or under excess pressure you might even suffer bending of the plastic top.
I'm afraid to say it all points to a crack in the head allowing excess pressure to get into the coolant system.

Details and colour codes on the wiring diagrams here - you will need to enable Flash to view the diagrams however, Chrome by default turns Flash off;

No expert on this but there is the Throttle Position Sensor (TPS) which if the cable had been adjusted might now be in the wrong position and as its this which tells the ECU/Autobox when to change might be the problem ?

I don't suppose the spare tyre winding rod would fit ? Just looked at the end or the original YKK style winder and its the same shape but no dimensions on the pictures of course ....

A swap loom is 4 wires and a new fuse box, that connects to the LB, the 4 wires (loom) go to the original fuse box and you pull the 4 fuses, which includes the blinds and put the wires into the lower slot as below, this transfers those circuits across to the LB and are now permanently powered from t...

Add a leisure battery with Split Charge Relay and swap loom to move the circuits over.

You will be looking at an OLD vehicle, more than 20 years old, you will need to spend a lot more money on it maintaining it at that age. Whilst I love the vehicles I would not be suggesting such an old one if you have limited money and mechanical skills to be able to maintain it yourself to be honest.

Excellent news!
....... here follows a tirade against modern business's - self censored .........

Try this company in Plymouth https://www.startermotor-alternator-sto ... us-2-w.asp

Bear in mind that Starter Batteries whilst are good for brief high currents they don't like being heavily discharged so draining the SB down to well below 11 volts will harm them and reduce there overall life significantly. Whilst they will appear to come back you can expect there overall life usual...

I wonder about de-gassing tanks, given the problems people have with stained ones and availability of "new" ones ?
I think Haydn looked into a metal version after cracks started to appear in some as I recall but the cost was not appealing at the time.

Have you checked the cupboards inside, the better conversions move the control panel onto the dividing wall which is the limit of the existing cables?

Pretty typical behaviour from what I see! All you can do is ring around the various firms - see the Insurance link https://igmaynard.co.uk/insurance/ - and get a variety of quotes, don't give up with C&CC or Ageas get back to them with your best quote and see what they then offer. Remember its a Mar...

The green "eye" shows the state of charge, if its staying in Black then that suggests either not being charged or a dead battery, most garages can test the battery itself with either a modern tester or a "drop" tester to see how much charge is being retained. However if its an original Jap battery t...