===== Coolant Hose Part Numbers =====
==== Radiator Hoses ====
There are five basic radiator hoses attached to the front of the engine. There are two upper radiator hoses, one lower hose, one thermostat housing hose, and one bypass hose. The only hose that is not a molded hose is the thermostat housing hose. All others are custom molded to shape to work in the Z31. The part numbers are:
^  Hose Location  ^  Part Code  ^  Part Number  ^
^ Bypass  |  14055M  |  14055-01P00  |
^ Thermostat  |  14055N  |  14055-V5010  |
^ Lower radiator  |  21503  |  21503-01P61  |
^ Upper radiator - front  |  21501  |  21502-01P25  |
^ Upper radiator - rear  |  21501N  |  21501-01P26  |
==== Heater Core Hoses ====
There are five basic hoses associated with the heater core. It will be very rare for you to need to change these. It would be even more rare for you to have to change the two that are inside the cabin of the car. They are also virtually impossible to get to unless you remove the dash. The part numbers are:
^  Hose Location  ^  Part Code  ^  Part Number  ^
^ Block to water cock  |  27184  |  92400-22P00  |
^ Water cock to firewall  |  27183  |  92406-01P04  |
^ Firewall to water block  |  27181  |  92410-01P00  |
^ Internal hose 1  |  27025  |  27144-01P00  |
^ Internal hose 2  |  27026  |  27146-01P00  |