your windshield seal could be bad or you may have a bad heater core if it is leaking bad you'll know soon enough, its the heater core!. Mines doing the same thing and its the heater core. The bad news is that the part is only 75.-100. bucks but the labor will eat you alive.
full filter locatoin on a 1991 Cadillac Seville
No
18.8 U.S. gal
Drop the fuel tank. Its in the tank
190 deg Fahrenheit 195 to 215
the heater core is up under the dash on the riget side.
Inside the gas tank, along with the sending unit (the part that displays how much gas you have on the dash).
it is on the inboard side of the front valve cover driverside end, you will need to replace the grommet also
ANY 91 FRONT WHEEL DRIVE CADALLIC WILL WORK BUT IT MUST BE FROM A 1991!!! THEY CHANGE THE ELECTRONICS IN THE TRANSMISSIONS IN THAT YEAR NO OTHER TEARS WILL MATCH THE ELECTRONICS PLUGS
firing order for a 1991 cadillac deville
Begin by removing the power steering pump belt from your 1991 Cadillac power steering pump pulley. Remove the power steering pump pulley retaining bolt. The retaining bolt will be in the center of the pulley.
LOOK UNDER THE HOOD, ON THE DRIVERS SIDE, RIGHT ABOUT THE WHEEL WELL, THERE SHOULD BE A BLACK BOX, IT WILL HAVE RELAYS IN IT, THATS WHERE YOU SHOULD FIND IT.