Someone disconnected the heater hoses in my cutlass. When can i find a diagram of how they go back on.

It should be obvious. They are the only 2 heater hoses connected to the firewall.

Hi Ronald,

That vehicle is equipped with one of the easiest heater cores in the world to replace. Here are the instructions form the service manual:

Drain cooling system. Raise vehicle. From underneath, remove heater hoses from heater core. Remove drain tube. Lower vehicle. Remove right and left side sound insulator panels. Lower heating duct and hoses. Remove heater core cover and heater core. To install, reverse procedure. Fill and bleed cooling system.

HINT: I never drain the cooling system to replace a heater core. It is not necessary if you use a couple pairs of long-nose Vise-Grips to clamp off the heater hoses before you disconnect them from the heater core. That way, the only coolant you will lose is what is actually in the heater core itself.

1. Disconnect the negative battery cable and drain the cooling system.
   
2. Disconnect the heater hoses from the heater core inlet and outlet connections in the engine compartment.
   
3. Allowing residual coolant from the heater core to drain. Cap the openings.
   
4. Working inside the vehicle, remove the lower instrument panel sound insulator and look for where the air blows to your feet.
   
5. Remove the heater floor outlet duct screws or clips and remove the duct.
   
6. Remove the heater core cover by removing the attaching screws and clips.
   
7. Remove the heater core cover.
   
8. Remove the heater core retainers and remove the heater core
   
9. Reverse order to install leaving the covers off at first then connect all hoses, refill and check for leaks before putting covers back.

There are two heater hoses, each appx. 1 inch wide, that run from the engine and hooks up to the heater core, behind your dashboard. The heater core's two connection pipes stick out from the firewall of your jeep and you have to attach the two heater hoses to those two pipes. If someone disconnected your heater, they probably just joined together the two heater hoses, that run from your engine, so now you'll have to disconnect that joining and reattach the hoses to the heater core pipes. That way, hot coolant will flow into the heater core to warm you up.

bypass it with rubber hose

1. Disconnect the negative battery cable and drain the cooling system.
   
2. Disconnect the heater hoses from the heater core inlet and outlet connections in the engine compartment.
   
3. Allowing residual coolant from the heater core to drain. Cap the openings.
   
4. Working inside the vehicle, remove the lower instrument panel sound insulator and look for where the air blows to your feet.
   
5. Remove the heater floor outlet duct screws or clips and remove the duct.
   
6. Remove the heater core cover by removing the attaching screws and clips.
   
7. Remove the heater core cover.
   
8. Remove the heater core retainers and remove the heater core
   
9. Reverse order to install leaving the covers off at first then connect all hoses, refill and check for leaks before putting covers back.
   

I'm going through the same problem on my '89 Regal, just no time to fix it. I would check if the heater core is clogged. Drain some of your coolant out your radiator and disconnect both heater hoses from the engine. take a garden hose with an adjustable valve on it and stick it in one hose, then the other, back and forth, until the water runs out strong and clear. Hook your hoses back up and top off your coolant. Works every time for me! Hope this helps ya!

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. 

Pull the panel under the glove box. You should be able to see the heater core. disconnect the two hoses under the hood on the firewall to the heater core. put a pan below to catch the antifreeze. Replace heater core. reconnect hoses.