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: are 95 cadillac deville good cars?
Pretty dependable,but not cheap to repair when there is a problem.
SOURCE: why is my car leaking oil its a 1995 cadillac
well, oil seals get old and an engine is still considered to be good, according to what I have read on the Internet, if it consumes less than 1 quart per 1000 miles.And, one should change the oil every 3,000 mi. according to most reputable oil change garages.
Granted if it's leaking any oil, that is not ideal.
Rubber seals and gaskets can get oil soaked and spongy or tightness of bolts that hold gaskets on can be too loose (but I wouldn't overtighten bolts as they only go in so far)..
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