Don't remove it if you aren't getting heat. Just take the two hoses off the heater core (at rear of engine going through the fire wall on passenger side) and blow compressed air through both inlets on it. It would also be a good idea to change the thermostat also.
No you must remove the dashboard. I just had it done on a 1996 Bravada and it cost me $450.00.
Could be, Low on coolant, A stuck open thermostat, A plugged heater core, A faulty temp blend door actuator,
To replace most heater cores you have to remove the dash on the passenger side.
It is behind the dash assembly, inside the HVAC (Heating, Ventilation, Air Conditioning) box. Replacing the heater core is a difficult job and more so if the vehicle has AC. If you intend on DIY, purchase a shop manual for that vehicle, you will need it.
how do you replace a heater core in a 91 Oldsmobile 98
Remove the upper intake.
punt
Remove the upper intake and there it is.
Replacing a heater core is never an easy task, that is why the labor charge is high. You just have to remove the stuff, as you call it, in order to access the heater core. No other way to do it. Replacing the core is simple, getting to it is the hard part.
Heater core is inside dash board by firewall.
you need to replace your heater core.
unscrew it unscrew it unscrew it unscrew it