* [[http://www.peachparts.com/shopforum/diesel-discussion/380182-w123-coolant-heater-hoses-part-numbers.html|coolant parts breakdown]]
  * [[https://www.peachparts.com/shopforum/diesel-discussion/262523-diy-water-pump-bypass-hose-replacement-om615-616-617-a.html|replace water pump bypass hose]]
  * [[https://www.peachparts.com/shopforum/diesel-discussion/308800-w123-coolant-bypass-hose-replacement.html|water pump bypass hose replacement]]