Some type of cooling system so as Hagstrom says oil cooling or as LesW could be aircon.
(I was beaten to it again!)
Hope you soon get it fixed.
Looking at where it is, near oil filter and with what looks like a pipe coming from the bottom of the engine I think oil cooler but I could well be wrong. Is there anything leaking from it?
Intercooler air gets hot when compressed, think finger on the end of a bike pump. engines run best on cold dense air as more oxygen in it so between turbo(compressor) and cylinder the fit a cooler
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