The heater core is leaking. Replacing the heater core is your best bet.
Probably a leaking heater core.
The problem when the digital dash of a 1994 Chevy Caprice goes out might be a fuse that is blown under the dashboard. This might also be related to a problem with the computer or with the wiring to the dash.
Look under the dash where it is mounted. The bolts may need to be tightened. If that isn't the problem, you have inside damage.
Under the dash behind the brake pedal
behind the glove compartment, under the dash.
Under the dash and to the left of the steering column.
You most likely have a heater core that is leaking.
There is a problem with the ABS. Take it to a professional.
Under the dash and to the left of the steering column.
heater core???
It may be condensation from your air conditioner condenser. The drain tube may be plugged causing water to back up and leak from under the dash. A windshield leak may also cause your problem.
Check the upper end of the brake pedal under dash
Look under the dash to the left of the steering colunm. Its not the easiest thing to get to but that is where it is.