Question about 2002 Pontiac Firebird

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Ok,I have a 2002Firebird 3.8 seriesII, V6 coolant/water is coming up from radiator with cap off.

I just replaced the water pump and the oil pressure sending unit sensor and a new thermostat. I did an oil change already. I did see some goo on the oil cap like milky goo. My coolant is coming up from my radiator with cap off as it warms up. I'm thinking a blown head gasket or maybe a clogged radiator.

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Milky white and and water rising with air bubbles sounds like head gasket gone, if it is when replacing have the head checked just in case it needs resetting as they can get warped, take plugs out and check what colour they are, it will show how bad the engine is, black sooty is oil, brown gold oil water mix. red or blue colour can be over heated plugs but that doesn't happen much theses days.

Posted on Apr 27, 2015

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When you change antifreeze an air pocket is created in engine behind thermostat. You must let it run until the thermostat opens. Until then, liquid will boil backfkowing through bottom of radiator.
As for milky look, blown headgasket would cause white foam that if left alone wouldclear up. Otherwise it could be an additive in the fluid such as rust preventative.

Posted on Apr 27, 2015

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Why is my car loosing antifreeze


There can be numerous reasons for coolant loss.

External Coolant loss
1. Coolant escaping from the radiator cap. Replace the cap.

2. There is an external leak in the system which could be from a hole or crack in the radiator(especially the plastic sections) or a hole in a radiator hose or there is a loose hose connection.

3. The water pump gasket has deteriorated and coolant is escaping from around the water pump fitting.

4. There is a crack in the coolant overflow reservoir and coolant is leaking out.

Internal Coolant Loss
1. Coolant is escaping into the engine's cylinders in which event you will see white smoke coming out of the exhaust and you will also have combustion gasses leaking into the coolant passages which will cause bubbles and overheating of the coolant. This problem will be due to a failed cylinder head gasket, a crack in the cylinder head or both.

2. Coolant is escaping into the engine lubrication system and in that event you will see evidence of coolant in the engine oil. Pull the oil dipstick and check the condition of the oil. If it looks a bit like chocolate milk and not just normal oil colouring you have coolant in there. Also check the radiator cap when the engine is cold. There may also be evidence of oil in the radiator coolant that is stuck to the radiator cap and around the neck of the radiator.
This problem will also be due to a failed cylinder head gasket or a crack in the cylinder head or both.

Whatever the cause in your case don't hesitate to have it checked out by a competent professional If you lose coolant and you allow the level to run significantly lower than normal the engine will overheat and you will cause very expensive engine damage.

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