Yes, both the heater core and evaporator are in the HVAC housing, which has to be removed to access either.
To change the rear axle fluid you can remove the rear cover from the axle and drain it that way. If you don't want to remove the rear cover you can use a pump and a hose to drain it through the fill hole.
It is inside the HVAC housing, which is behind the dash.
No.
It is on the lower driver side of the radiator.
Thermostat stuck open, heater core clogged, or the heater temperture control vlalve is defective.
NoNo
very carefully
how do you change the heater core on a 99 cadillac deville? I need to know, "Kaiser."
The 1996 GMC half ton pickup truck heater core can be removed by removing the heater core retaining bolts. Remove the heater core water lines. Reverse the process to install the new heater core.
Heater core is leaking. Air Conditioner drain hose is plugged.
To change to the heater core on a 1996 Tacoma you first need to drain the coolant from the cooling system. Be prepared for a mess and have plenty of towels to soak up any excess leakage. After you have drained the cooling system remove the fasteners, clamps and plates. Give a good upward pull to remove the core. If you are using the same core, clean it thoroughly before reinstalling. Follow the same steps in reverse to install.
Pull the lower cover off the interior passenger footwell. look for a rectangular case about the size of a bible. There should be some cover over it. Remove the cover and the heater core is like a cartridge, it pulls out. You must drain water before attempting this.