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Sounds like the cable is disconnected from the water valve. Check under hood at the fire wall where heater hoses connect to heater core. Water control valve should be in one of the two hoses and the cable end should be visible . Water is off when A/C is on.
The inlet going TO the heater core should be the top one (I think) but in any case it would be the one with the heater control valve on it (see picture below) Hope this is what you were looking for....
you will need to remove the heater housing(air box) . the blower is mounted in it. start by removing the control cables (slide your heater controls and you will see them move under the dash),they just snap in place.be careful not to break the plastic tabs. unhook the defroster tube(looks like a corrugated paper pipe in the center and on the top of the housing). unplug the wire harness in the upper corner of the passenger side. now under the hood remove both heater hoses. then remove the four mounting nuts on the firewall [they are 7/16] . one nut is on right side of the battery.one just left of the battery. one is under the battery toward the bottom of the firewall.the 4th is by the left rear corner of the valve cover. there may be an accelerator cable loom snapped over this stud,it just pries off. lay a towel or rags on passenger floor to catch any anti freeze. with all 4 nuts now removed,pull the housing away from the firewall.you may have to tilt the bottom out slightly. once the housing is removed take it to your work bench. There will be a metal panel on the fire wall side of the air box remove the screws to remove this panel to gain access to the heater core. fairly simple,but the nut under the battery can be a pain to get to.
ok you got some possibles.1 check cabin filter if signs of water than drain plug on fire wall cloged.causing water to enter by over filling and no were to go.but thru the filter.easy fix.also if you losing anti-freeze than that will point at your heater core leaking from line or core itself.need to test it,turn on heater and check floor with a towel. lay it on floor going up to firewall inside truck.go for a good drive so pressure can build and heater on.while engine hot look at floor towel top part by firewall wet prob heatercore.also check if door is wet to eliminate possbility of door seal leaking.let me know.
check your coolant level if it is low top it off. if it is full you may need to change your thermostat to get the temp back to normal. for the heat check the heater control valve to make sure it isn't stuck (heater control valve should be located against fire wall connected to heater hose.
The Heater control valve that mounted on the fire wall may be at fault some what common on Nissan vehicle. Open valve manually with the lever on top if you get heat replace vale but first chech vaccum house connected to valve for vaccum. Good Luck