if its under the dash by your feet its the heater core is bad
Is it leaking from the water pump or radiator? Is the system properly pressurized?
cracked head, or leaking head gasket, or cracked block
There are multiple reasons why a battery would go down on a 1991 Cadillac DeVille. There may be a short in the electrical wires, the battery may be old or low on water, or you may of left an inside light on.
when you go through deep water
see answer given on how to change water pump on 92 deville. Same car.
water pump sai pump if you were leaking coolant, water pump if your engine sounded like a 747 on take off at start up, sai pump
How to replace the belt
where is water pump located
If a water pump is bad they usually leak coolant
Get manual from the parts store or from AUTOBOOKSONLINE.COM
Front of engine---r/s underhood
2 gallons