I have a bad heater core how do I fix it - 1988 Cadillac Fleetwood

Vickie, your heater core and duct work for it, are all above the location you are getting drip from. So it makes sense that the heater core is leaking. Link to video will show whats up.
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There is a valve that is vacuum opperated that allows hot coolant to flow into the heater core inside the car. The valve is mounted inline w water hoses leading to heater core. Has a vacuum line running to it. Make sure it works. Turn heater on. Remove vacuum line see if valve accuates. Movement it works. No movment either valve is bad or no vacuum at valve. Check and make sure there are actually coolant lines leading to heater core. Somtimes when a heater core goes bad and starts leaking (you will smell coolant odor in vehicle) a quick fix is to remove the lines and link them back to each other under the hood. No heat no defrost. Make sure this isn't the case w your car.

I’m happy to help further over the phone at https://www.6ya.com/expert/louis_03c793f49b118a83

the heater core went bad the only fix and still have a heater is to replace the core

sound like a bad heater core! the heater core is like a small radiator that is usually locaded in the dashboard on the passenger side. now if the leaking is really bad you are going to see water dripping by the front passenger tire or if it gets really bad it may leak inside the car. in order to fix this problem the HEATER CORE must be replaced. good luck

THAT HAS NOTHING TO DO WITH A HEATER CORE IF CORE IS GOING OUT IT WILL LEAK THATSOUNDS LIKE AN ACTUATOR ACTING UP OR VACCUUM LINE LEAK BEHIND DASH

probably your thermostat

Your heater core is bad. Replace the heater core and you have fixed the problem.

Don't use stop leak, use regular kitchen black pepper. About 2 tea spoon should stop the leak soon as the pepper makes it way to where the leak is. Black pepper will clean up after you flush the coolant system and will not leave any residue like the stop leak that will restrict the coolant journals and water jackets in the engine block and radiator.

Removed the center console to get to the panel that holds the heater core. the heater core is in the center of the car under the radio. There are 7 screws holding the cover on. Once you remove the 7 screws, there are two straps that hold the core inthe heater box (2 screws per strap. Some cars are easier to get the heater hoses from underneath after jacking up the car, some you can get to from up top under the hood behind the engine. It's not a 15 minute job, but not difficult at all. I usually suggest pulling out the passenger side seat to give a comfy place to lay while doing it. the seat comes out with only four bolts, and you won't have to contort your self to get the heater core out. Your low coolant light is due to air trapped in the system. Anytime you open the cooling system on a 3.1, you have to bleed the air out using the bleed valves on the t-stat housing and transfer tube (some only have one on the t-stat housing. If you have a 5 speed, your going to remove the shifter knob and just yank on the plastic that had the boot. (it only has snaps that hold it on) Then there are 2 bolt holes in the armrest compartment. and 4 more which are under the boot and plastic. Very easy to take off and put on.

Good luck, and other way is to by pass the heater core at the heart hose, but your not going to have any heat.

Check blower motor fuse.

that means your heater core is bad. It is not hard to fix but it is time consuming. Heater core is located behind glove box