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looks like you had harder time than me.
Good point to talk about the click sound. I remember how hard it was to push the hose back. But its very easy to see if its on place. If its not connected proprely, a light pull will remove the hose from the t-stat.
its also hard to know if the hose clamps are tight enough or too tight.
not tight enough will might get into a leak, or if its too tight, it can break the water pump or t-stat housing.
BMW have this issue for a long time (n52 n54) and they still gives no access to it. The pump position on the bloc is good, but everything is there to not get the access.
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