To repair the 1998 Cadillac Catera coolant system, the steps will vary depending on the actual problem. You might need to replace hoses or connections or you might need a new radiator or thermostat.?æ
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On the Catera you do not add coolant through the radiator. If you need to add coolant to the cooling system, you should do that through the expansin tank. This located on the passinger side inner fender wall. It looks like a see-thru plasic tank with a yellow cap. Do not open when coolant is hot!
Air can get into the cooling system when the coolant is replaced as either part of a maintenance schedule or when the system must be drained for a repair. When the coolant is replaced the coolant system must be "burped" to get any air out of the coolant lines. There are various ways to do this dependant upon the type of vehicle. A repair manual for your vehicle will describe the proper technique.
Depends on the car and what is actually wrong with it
First pressure test system to determine where leak originates
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You can try to repair your car air conditioner at home by adding coolant or flushing the coolant system. If that doesn't work, it could be a more complex problem with the car's electrical system and unless you are a mechanic, you should probably take it to someone who is to avoid more damage.
Pressure test system to determine where leak originates to repair Water Control Valve, on pass. side behind engine.
fail safe mode is for the 4.6 L V8 engine only - it means that you have lost your engine coolant - find the cause of the coolant leak and repair it , then refill your coolant system
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If there is oil in the coolant reservoir that means that the oil has gotten into the cooling system. The most likely place for oil and coolant to meet is at the cylinder head gasket. I hope this isn't the case because it's a very expensive repair.