I need instructions on how to remove a heater core from my 1967 Cutlass Supreme with A/C. After looking under the dash, the heater and A/C control cables are attached to what must be the enclosure box. I'll need step by step as to what needs to be removed please. Thank You GJN

Here's a link showing you how to replace your heater core. Repair Guides Heating And Air Conditioning Heater Core AutoZone com Here's a new heater core.Take yours out first,then take to Autozone,they will need your old one for no core charge.

i need see the steps to changing a heater core in a 87 oldsmobile cutlass supreme

The thing to do is check for vacuum leaks. In the engine bay look for any "hoses" coming from the firewall. These are for the heater contols. If any of these are broke? Replace them . Have you installed a after market radio? Sometimes heater controlls get messed up. I would take the radio out and examine the heater controlls.

If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing

• The heater housing is usually under the dash and must be removed to gain access to the heater core.
• Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.

The heater housing is disassembled to get to the heater core. Heater Core

• Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
• Remove the heater coolant hoses.
• Remove the cable and/or vacuum control lines (if equipped).
• Remove the heater core securing brackets and/or clamps.
• Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
• To reinstall the heater core, reverse the removal steps.

When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing

• The heater housing is usually under the dash and must be removed to gain access to the heater core.
• Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.

The heater housing is disassembled to get to the heater core. Heater Core

• Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
• Remove the heater coolant hoses.
• Remove the cable and/or vacuum control lines (if equipped).
• Remove the heater core securing brackets and/or clamps.
• Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
• To reinstall the heater core, reverse the removal steps.

When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

it is located under the dash, most likely on the passengers side, close to the kick panel... but it doesnt seem like an actuator to me.... it sounds more like heater core, i would take the lines off to it and backflush it with a water hose, you will probably be suprised at what comes out.. incase you dont know what the actuator looks like, it will be a round like pancake looking canister with two vaccume line hoses going to it.. hope this helps you

the heater core is located under the dash board on the passenger side there is a few cap screws holding this black plastic box that hides the heater core loosen all the screws .take the plastic out of the way and u will see the heater core .there are two hoses to disconnect on the out side .under the hood on the passenger side .up near the fire wall .the re is a avaperation tank silver in color for the a/c under that there are two heater hoses to disconnect .when u remove the two hoses .they will leak antifreeze .bend the hoses over to kink them .tie some elec tape around them to keep them from leaking .go back in the car and loosen the four small screws that hold the heater core in place and remove .....in stall the new one the same way .taking care when putting the new one through the fire wall not to damage the brass tubing ...mount heater core first the place hoses on after the screws are holding the heater core in place then put plastic cover on start car and wait for thermostat to open .turn heater on hot .after water is circulating .refill radaitor ...job done...

Your heater core has gone bad and needs to be replaced, If you go to Auto Zone you can pick up a new heater core and they will have the step by step instructions to doing the job yourself. If your lucky, may be the radiator hose to the heater core has failed at the cores pipes and it's only the hose that needs to be replaced but thinking not. You can get by pass the heater core for now so you can still get around till you pick up the new Heater core. Follow the two hose that goes to the fire wall and disconnect both of them from the pipe from the firewall, then with a pipe and two clamps, connect the two hose together and that's how you by pass the heater core. Good luck friend and hope this helps. 

heater core is shot most of them are located under the dash board, look to make sure or call a garage they can tell u were its at

Cores come in 2 general design locations--in dash and under hood. Both are replaceable but the dash tends to be more problematic as it may include removing the entire dash assembly. under-hood may require opening up the air conditioner system to access the air plenum. Search Youtube for "how to" videos to get a good idea of knowledge and skills required.

The shop manual is available from auto part supply stores for around $30 and in some public libraries. You may have a split or lose hose and not the core itself. Suggest you first rent borrow or buy a remote inspection camera to locate exact leak location.