Question about 1998 Cadillac Seville

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Overheating bigtime 1998 sts no white smoke , losing coolant , temp gauge runs up to H after about 30 minuets running it around

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  • eric forbes
    eric forbes May 27, 2008

    do you have any more ideas

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Hi I had an 1998 sts. It was llosing coolant from abt 20k miles. The dealer could not trace the source. Anyway at abt 100k miles i blew the head gasket and damaged valves. Lots of £££ to repair.
At that time they found a small crack in the radiator.
Might be worth a look.

Posted on Jul 30, 2008

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Did you check the oil?does it look milky?

Posted on May 28, 2008

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My 1998 Mazda millenia Is shorting white smoke more tell pipe what could be the problem


It is common to see white exhaust smoke when first starting a car, especially on cooler days. This is generally steam caused by condensation. As the engine warms up and the condensation dissipates the white exhaust smoke (steam) is no longer seen. If excessive white exhaust smoke is present well after the engine warms up, it is necessary to have the car inspected for possible internal coolant leaks. Indicators of an internal coolant leak include billowing white exhaust smoke accompanied by a sweet odor or a low coolant reservoir level. An internal coolant leak can also contaminate the engine oil giving it a frothy, milky appearance. Even small amounts of coolant entering the combustion chamber will produce white exhaust smoke. One of the main causes of white exhaust smoke and coolant loss is a cracked or warped cylinder head, a cracked engine block, or head gasket failure caused by overheating. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine. Dirty coolant, a poorly maintained cooling system, a low coolant level, or a non-functioning cooling fan can cause engine overheating. In addition, engine wear can eventually cause the gaskets to lose their capacity to seal properly allowing internal coolant loss. Intake manifold gasket and head gasket failures are two of the most common sources of internal coolant loss caused by engine wear.
Never remove the radiator cap or coolant reservoir cap while the engine is hot or running as it can cause serious injury; always allow the car to cool down completely first. Checking for a low coolant level in the reservoir is the first step in determining if coolant loss is causing the white exhaust smoke. If the coolant reservoir is at the proper level but excessive white exhaust smoke is present, a cooling system pressure check is required to determine where, if any, coolant leaks are located. THESE LEAKS WILL CAUSE SEVERE ENGINE DAMAGE! Have the car inspected immediately.

I
Internal coolant leaks can and will cause

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My 1998 expedition overheated yesterday (gauges did not indicate hot). It smoked and when it cooled down I put coolant in and today when I went to drive it was not wanting to accelerate and the rpm dial...


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White smoke is burnt coolant. Take the car in and have a pressure test done on the rad. It's probably going to lose pressure slowly so get a compression test done on the engine. This will most likely show a leaky head gasket. That is the most common cause of white smoke out the tail pipe and could also cause your other symptoms. Hope this helps.

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Please check the radiator it may be leaking or there may be hole in the coolant container or the sensor is defective get it checked ..................................

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1 Answer

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Is the temp gauge high?Does the car blow white smoke?Check the oil and see if you have antifreeze/water in the oil.You may have a blown head gasket.Im assuming you have a norhtstar motor.

May 27, 2008 | 1998 Cadillac Seville

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