why doesn't my 1991 isuzu trooper heat,?

[Troy G]

I replaced the thermostat, the water pump, the freeze plugs, and the guage still doesn't move past cold

 

[severed27]

check the heater core, head gaskets and the temp. sending unit.

 

[severed27]

check the heater core, head gaskets and the temp. sending unit.

 

[severed27]

check the heater core, head gaskets and the temp. sending unit.

 

[severed27]

check the heater core, head gaskets and the temp. sending unit.

 

[severed27]

check the heater core, head gaskets and the temp. sending unit.