SOURCE: 1995 cadillac deville 4.9 eng no heat
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
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SOURCE: 2003 cadillac deville want start
check battery voltage, if battery voltage is ok, you may need to check fuses under hood on passengers side, if start fuse is ok, you may need to have your starter replaced
SOURCE: water leak inside on passenger side from under the
Your heater core is leaking, and when it does, it drains into the foot well passenger side. Best case would be a hose that is leaking, worst case is the core itself. Replacing the core is a big job.
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