95 S420 question on rad. hose collapse
 

Should I be concerned about my radiator hose collapsing when the engine is cold. I would have thought that the vacuum would have pulled in water from the overflow tank, but it is also sucking the radiator hose flat while cold. There is no leakage nor do I notice any overflow while engine is hot and running. Temps are normal under all conditions. Never above 92 C and fans rarely come on even when idling with AC on.

thanks for your advise, ? this may be normal ??

DanielW