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Can someone help me - which radiator hose is this?
Stock Problems/IssuesDiscussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.
I would be more suspicious of your reservoir or cap, I think, but you can check the two hoses that run to the reservoir, too. IIRC, they run over to the heater hoses on the R53. I assume that the fluid isn't PS fluid? I believe CHF-11S is green, FYI.
+1 @deepgrey = power steering hose in the OP's pic.
+1 = coolant expansion tank cap or leaking/split seam in the expansion tank.
+1 - coolant on the heat shield not ps fluid.... If indeed coolant leak - The coolant is brown/discolored and suggests rust in the coolant system. I would recommend a coolant flush, in addition to a new expansion tank if the tank is dark yellow or brown and or a new cap.
A blown/failed expansion tank will leave you calling a tow truck. Don't let that happen to you.
Just my opinion/experience/observation.
Ask me how I know
Is that a base model? If so, I would highly suspect the overflow cap had popped. That's what normally happens first when it overheats anyway. Makes a loud popping noise, and coolant goes everywhere, even up on the windshield. Yes, I've seen this happen.