Shold be a weep hole underneath stem of water pump. If it's leaking water it needs to be replaced. You will be able to tell.
water pump
You'll have to take off the water pump because that is where the thermostat is.
Result is broken pipes, so symptoms are: 1) no Water at faucet 2) leaking water elsewhere.
No It Can Not.
do a coolant pressure test.
On my 93 the thermostat is behind the water pump. If you remove the waterpump you will see the thermostat.
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.
I have put this answer up many times. Go to DTAmotorsports an download you a free service manual. http://300zx-twinturbo.com/cgi-bin/manual.cgi
Sounds like either the windshield seal if defective or the heater core is leaking Check to see if water? is antifreeze
overheating/underheating water leaking from bottom of car behind fan. squealing
When it becomes loud or starts leaking. You can also change it if you have to do timing belt due to you have to take everything off anyway
What other symptoms besides leaking antifreeze? Where do you see the anti-freeze leaking?