Since having the upper radiator hose go out, and partially inspired by seeing @Spiker Engineering do it, I decided I should swap out all the 25 year coolant hoses. Would be a shame for one to blow out in the middle of Baja. Another benefit is cleaning up the heater hoses now that there is no rear heater.

Sourcing all the parts was a headache, and I created this hose mapping to help. This coolant hose diagram is only applicable to a 3RZ / 2.7 without the rear heater (aka auxiliary heater).


Part numbers of the hoses and clamps I purchased:

Radiator Hoses
1657-175180 - Upper
16572-75090 - Lower
90467-37005 - clamps(4) for above
90916-03120 - Thermostat
16325-62010 - Thermostat gasket

Heater Hoses (W/O Auxiliary Heater [aka rear heater])
87245-35430 - Heater to engine (Gates 19111 was much cheaper)
87245-35670 - Engine to valve
90467-22004 - clamps(4) for above
87245-35660 - Valve to heater
96134-42100 - clamp for above (valve)
90467-22004 - clamp for above (heater)

IAC + EGR
16261-75040 - Water by-pass (no. 1?)
16264-75020 - Water by-pass no. 2
16267-75010 - Water by-pass no. 3
96135-51300 - clamps(6) for above

Oil Cooler
16281-75011 - Water by-pass no. 4
16282-75012 - Water by-pass no. 5
90080-46349 - clamp(4) for above

Coolant metal pipe 1 to coolant metal pipe 2
16283-75010 - Water by-pass no. 6
90080-46349 - clamp(2) for above

Total cost was around $170. Hope this helps someone in the future from having to do all this hunting.

I continue to collect parts for the suspension: