You could remove the ABS fuse but the ABS dash light will remain on indicating the ABS system is not functioning.
Simply get it plugged into an ECU reader as it is probably a fault that the ECU is rembering, if not get a manual for your motor and look for an additional sensor.
The #1 cause of cold air from the heater when the car is stopped, or the engine is idling, low engine coolant levels.
There is a CEL, Check Engine Light, on the 1989 Thunderbird.
The brake light fuse on a 1987 Thunderbird is located on the back of the headlight switch. It is not in the fuse box.
Heater core (radiator) needs to be cleaned or changed
If there is a wick and plenty of kerosene the way to light the heater is to prime the wick with kerosene and turn on the heater and light it.
where is backup switch located on a 63 thunderbird
Low coolant, stuck thermostat, blocked hoses.
Add coolant to the reservoir. If the low coolant light still stays on, replace the low coolant sensor.
Reservoir light? You mean low coolant light. Low coolant level means the reservoir is low of coolant.