Steps to Repair Heater Core on an 88 Ford Thunderbird:
1. Drain the coolant from the radiator.
2. Remove the heater hoses from the heater core.
3. Remove the bolts holding the heater core in place.
4. Remove the heater core from the vehicle.
5. Inspect the heater core for leaks.
6. If the heater core is leaking, it will need to be replaced.
7. Reinstall the heater core.
8. Reinstall the bolts that hold the heater core in place.
9. Reattach the heater hoses.
10. Refill the coolant.
Additional Notes:
* You may need to remove the dashboard in order to access the heater core.
* This process can be difficult, so it is recommended that you consult a professional if you are not comfortable performing this repair yourself.
* Be careful not to spill any coolant on the carpet or upholstery. Coolant can stain and damage these surfaces.
* Be sure to use new gaskets when reinstalling the heater core.
* Test the heater core to make sure it is working properly before putting the dashboard back in place.
