Check your coolant. Is it thick and gunky?
my heater fan in front of my 2004 chevy venture van wont work
Do you have automatic locking hubs on the front axles?
try the bend door
Bad temperature sending unit? Bad gauge?
the heater fan resister,it is or should be on inside or on outside heater box.
A blockage in the heater core is the most likely cause. This is a difficult and expensive repair.
Depends, Is it blowing air at all? If not then could be the fan, fan motor, or an electrical problem possibly with the heater controls. If it is just blowing cold then your going to want to check the heater coil, on that truck I believe it is on the passenger side under dash/floorboard. you may smell anti-freeze if so the heater coil is the problem.
you have a bad heater core
No, Chevy changed the wiring harness in 2003. and the way it is mounted, it can be made to work though.
4 wheel drive does not work 1989 chevy half ton pick up silverado
it could but you might need to trim the rear a little
replace heater core in a 1991 Chevy work truck 1500