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300zx from 84 - 88 are z31
To install a thermostat on a 1987 Nissan 300ZX, remove the two nuts and one bolt on the lower water neck. Slip off the old thermostat and use a gasket sealant to secure the new thermostat.
On my 93 the thermostat is behind the water pump. If you remove the waterpump you will see the thermostat.
The bleeder valve for fuel injection for 1986 Nissan 300ZX is located at the furthest end of the fuel rail.
In the thermostat housing on the front of the engine were the radiator hose attaches
3.0 Nissan motor 3.0 Nissan motor
water pump
6.75
It has a small radiator, upgrade it.
When changing the thermostat on a Nissan 300zx first drain the coolant from the engine. Then find the lower coolant hose on the radiator. Trace the hose to the thermostat housing. Remove the housing to uncover the thermostat and replace the unit with a new thermostat.