I just replaced the heater core and had the battery disconnected. it's all back together and it will not stay running. you get about five times that will start and then it will not start until the key is pulled and then you get about five more. I think that it is a security issue, I just don''t know what to do to reset this. how do i reset this?

Something not plugged back in or loose connection? Heater core replacements are time consuming and a lot of electrical has to be disconnected to perform the procedure

log in to alldata.com and read that? its there?
anyone can,

1. Disconnect the negative battery cable. Drain the cooling system.
2. remove core hoses passing thru fire wall.
3. Remove the three duct mounting screws.
4. Disconnect the duct between the blower assembly and the heater unit.
5. Remove the five screws attaching the mode control case to the heater core case.
6. Remove the mode control case. Do not remove the link assembly.
7. Remove the five screws to separate the two halves of the heater core case.
8. remove the core.

why guess? why not just RTM
the manual covers that, the FSM factory service manual.
or alldata.com
storm is just an Isuzu Impulse
photos missing, below, go to alldata.com and see them.
Quote:
Disconnecting coolant hoses and refrigerant lines

1. Disconnect the negative battery cable. Drain the cooling system.
2. Remove the three duct mounting screws.
3. Disconnect the duct between the blower assembly and the heater unit.
4. Remove the five screws attaching the mode control case to the heater core case.
5. Remove the mode control case. Do not remove the link assembly.
6. Remove the five screws to separate the two halves of the heater core case.
7. Remove the core assembly.

unquote FSM

It sounds as if you have a blockage in your heater core itself. You can usually remove both hoses from the core at the firewall and using compressed air, blow backwards into the heater core until it is cleared. While you are there I would suggest changing the plastic elbows that come off of the engine if they have not been changed already as they are known to crack and cause problems. They are even remaking them in metal instead of the plastic.

If you changed your heater core, it has nothing to do with the car starting. Did you disconnect the battery when you did this? . The only other thing I can think of is a safety switch that won't allow the car to run if the water is low. This can happen if the system gets air locked. How did you fill the system back up? Did you hit any wires off while working on car? Did the car run fine before you changed the heater core? Let me know and we can go from there Cheers from NS Canada

this is a big job and requires the whole dash taking out ,as a stop gap measure join the heater pipes together so it doesnt leak inside the car but it will be cold to drive at this time of year .

Disconnect both hoses from the core and one of them also from the engine. Hook the other one back to where you took one off, making a loop. The picture below is not a bronco, but gives you the idea.
By the way, your core is easy to replace. It almost pops right out from under the dash. I ahve included picture below.

Remove and replace heater core procedures:

1. Disconnect the heater hoses from the heater core tubes and plug hoses.
2. In the passenger compartment, remove the five screws attaching the heater core access cover to the plenum assembly and remove the access cover.
3. Pull the heater core rearward and down, removing it from the plenum assembly.

To install:

1. Position the heater core and seal in the plenum assembly.
2. Install the heater core access cover to the plenum assembly and secure with five screws.
3. Install the heater hoses to the heater core tubes at the dash panel in the engine compartment. Do not over-tighten hose clamps.
4. Check the coolant level and add coolant as required. Connect the negative battery cable.
5. Start the engine and check the system for coolant leaks.

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.

Removal & Installation

Exploded view of the blower motor housing and the heater air plenum assemblies

1. Disconnect the negative battery cable. Allow the engine to cool down. Drain the cooling system to a level below the heater core fittings on the firewall.
   
2. Disconnect the heater hoses from the heater core tubes and plug hoses.
   
3. Remove the five nuts that secure the blower motor housing to the firewall.
   
4. Pull the housing away from the firewall. Disconnect any wire harness plugs which inhibit the housing.
   
5. Remove the remaining nuts which secure the heater air plenum (inside the passenger compartment) to the firewall.
   
6. In the passenger compartment, remove the instrument panel. Refer to Section 10.
   
7. Pull the heater air plenum rearward from the firewall and remove it from the vehicle.
   
8. Remove the heater core from the heater air plenum.
   
9. Inspect all air seals on the components and firewall and replace any that are damaged.
   

1. To install:
2. Install the heater core into the air plenum chamber.
   
3. Position the heater air plenum against the firewall from the passenger compartment.
   
4. Under the hood, install the plenum retaining nuts.
   
5. Install the blower motor housing to the firewall and install the attaching nuts.
   
6. Connect the heater hoses to the heater core tubes at the dash panel in the engine compartment. Do not over-tighten the hose clamps.
   
7. Install the instrument panel.
   
8. Check the coolant level and add coolant as required. Connect the negative battery cable.
   
9. Start the engine and check the system for coolant leaks.
   

You can unhook the hoses to the core and just hook them together with a flush fitting, or hose union.