They are heater plugs to heat the coolant up to enable the heater to give out hot air earlier in the van's warm up cycle.
They should carry quite a heavy current, and there should be a hefty earth wire or metal bracket connecting the unit to earth.
It sounds like the connections need a good clean, and also check the path to earth is OK too.
Edit: Looks like it earths though the bracket.
Also see ebay item: 201006214304 for an example
Last edited by: Number_Cruncher on Mon 27 Jan 14 at 14:32
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