I'm new to the Vanagon world and I = need a few answers .1 - I just purchased a = 1988 Vanagon GL , 7 seater and the middle seat slides from side to side on the = rails, I've looked for alocking system ,but haven't found any . How do I secure it ,I must be missing some = part ?Dunno...2 - The coolant light = flashes when I start the van and stays on until the vehicule gets = warm then it goes away,I've change = the coolant sensor and a leaky coolant overflow tank,and it still flashes, the = temperature gauge doesn't show anyoverheating it doesn't go over = the halfway mark . Does anybody have any idea what I can do to resolve = this ??****Could be the temp sensor is = bad... or the coolant level sensor... even though you replaced it it could be a bad one...3 - On my first long trip = with the van the oil pressure light came on after about 90 minutes = of highway driving , again thethe = van wasn't overheathing ,I just had an oil change 3 days prior to this trip , I = checked the oil level everything was o.k.It = didn't do the problem the next day in city driving , but when I drove back home = about 2 hours it did this again .It seems to happen when I take the cruise control off, ex: I cruise at 60 miles/hour everything = is o.k. I hit the bakes the rpm goes down and the oil temp seems to turn = on at around 2000 rpm. I've had the compression checked and everyting is o.k..*** the most common cause is using = the wrong oil filter and/or the wrong oil... What filter do you have??? What weight oil???Should be using a Mann/Mahle filter = (or VW dealer filter replacement) and 20-50 oil (except in winter in very cold places).BillCan anybody help = ????Thank you in advance ,Vanaman99