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leslea
leslea 2/24/2012
1993 Buick Park Avenue Ultra 6Cyl3.8L - Engine
What is probable cause for loss of coolant
A/c went warm and noticed temp gauge was hot and loss of water
2 Answers
  • CVO
    CVO 2/24/2012
    1. Obtain a radiator pressure tester free loan from the local auto parts stores v.d. Autozone, O'Reilly or PepBoys. Follow instructions and pump it họ an adequate air pressure in the radiator cap on allowances lbs. Observe the leaks and perform the repair.
    Note: do not over-pressure than the pressure in the radiator cap allowed.

    2. Loss of coolant because of a coolant leak is probably the most common cause of engine overheating. Possible leak points include hoses, the radiator, heater core, water pump, thermostat housing, head gasket, freeze plugs, automatic transmission oil cooler, cylinder head(s) and block.

    Make a careful visual inspection of the entire cooling system, and then PRESSURE TEST the cooling system and radiator cap. A pressure test will reveal internal leaks such as seepage past the head gasket as well as cracks in the head or block. A good system should hold 12 to 15 psi for 15 minutes or more with no loss in pressure. If it leaks pressure, there is an internal coolant leak (most likely a bad head gasket but possibly also a cracked cylinder or engine block).

    It is important to pressure test the radiator cap, too, because a weak cap (or one with too low a pressure rating for the application) will lower the coolant's boiling point and can allow coolant to escape from the radiator.

    NOTE: see this link.
    http://www.aa1car.com/library/overheat.htm
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  • yboy82
    yboy82 2/24/2012
    Did you notice any leak under your vehicle or any puddle of coolant under your vehicle? You perform a radiator and cap test ( http://www.automd.com/.../) to locate any visible leak and to determine the condition of your radiator and cap.
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    yboy82
    leslea 2/26/2012
    Yes I have bad leak in passenger side under motor it pours out
    yboy82
    CVO 2/26/2012
    A broken hose or a water pump may be the cause of this problem. See these instructions to understand or to perform the repair
    http://www.autozone.com/.../...rGuideContent.jsp
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