Question about 2003 Chevrolet Impala

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Seem to be losing oil in coolant of 2003 impala 3.4

2003 Impala 3.4 engine started overheating and I flushed out the coolant system and refilled. Sometime later after checking the oil it would be about a quart low. Well now a few months later it is overheating again. I have flushed coolant system again, noticing some milky and brown looking deposits around the radiator neck. The car runs fine but seems like oil is entering the coolant system. I believe over time the coolant system is becoming plugged do to oil in it. Do you think this may be a head gasket.

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  • Anonymous Feb 08, 2009

    i have same probleme

  • Enginetech Feb 13, 2009

    I have a 2004 and is doing the same thing. Before going ahead with changing the intake gasket, I had the local garage check it out. They told me it was a leaky head gasket. I repaired it with a good gasket set and it is still having the same problem. Heads resurfaced both gaskets replaced (Intake & Head). I spent the extra money and bought Fel Pro gasket set. I'm not sure were to go from here other than talking to the garage and have them look at it again. I've built a lot of engines but never seen anything like this??? I'm not sure were to go from here???

  • Anonymous Mar 13, 2009

    I have a leaky intake gasket problem. I have a 2003 imala 3.4v. My garage is pricing the fix at 526.00, is that a fair price? My AC has been a problem for quite a while. Now our blowers are out...we live in AZ, so we can't be too cheap about that fix.

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Hello your intake gasket is most likely leaking internally into your engine.pretty common problem.the plastic and silicon gaskets get weak over time.

Posted on Jan 26, 2009

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The 3.4 Chevy engine is notorious for intake leaks. The stock gaskets they put on there are not the best, get some quality gaskets and this should help your problem. Mine did the same thing, as well as someone else I know. It's just a 3.4 thing, lol.

Posted on Jan 31, 2009

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It sounds like the start of a leakey head gasket a head gasket stop water , oil and compression from mixing together If the car has been hot in the past i would change the head gakets and flush radiator professaly before you end up with a cracked head

Posted on Jan 26, 2009

  • Angelo Attard
    Angelo Attard Jan 26, 2009

    the head gasket is gone between a water and oil gallery the oil is going in to the water because oil pressure it 60 psi aganist water 6 - 15 psi have the head surfaced for a better gasket seal

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You need new head gaskets!

Posted on Jan 26, 2009

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1 Answer

2003 impala heater quits working sometimes and it overheats sometimes


You should have it checked out right away, before the overheating does any damage to the engine. The whole coolant system should be inspected to find the cause. It may be a simple fix, maybe not. Are you adding coolant constantly? Do your radiator fans come on when it starts to overheat?
When it gets too hot, it may be boiling coolant away, and the low coolant level will cause the heater to stop putting out heat.

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1 Answer

Oil in coolant


Thoroughly flush out the coolant expansion tank and cooling system, radiator , engine block ect... with a commercially available cooling system flush (Prestone or any other brand). Oil will damage the rubber cooling system hoses. Refill the cooling system with the correct amount of fresh antifreeze and drive the car after the cooling fans have cycled on and off. When the cooling system has cooled down top up as required and keep an eye on the cooling system for a few weeks to see if the problem reoccurs or if someone had inadvertently put oil in the reservoir.If not I'm more leaning toward a blown head gasket. it will run fine but you will have to keep the water clean out. to fix it buy a head gasket and surface the head..you have a blown head gasket

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1 Answer

I have a 2003 Impala with a 3.4 with 237000 miles . Have a sporadic overheating problem. Car will be running.fine then the heat will blow cool and the car will quickly overheat. After a few minutes the...


The is likely air trapped in your cooling system and as it moves the problem comes and goes. Check your coolant level and apply vacuum to the surge take to evacuate the air pockets.

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Sounds like you have a air bubble in the cooling system. What size engine? Did you open the bleeder valves when you refilled it with antifreeze?

Dec 06, 2010 | 2003 Chevrolet Impala

1 Answer

How do you flush out the coolant system in a 2003 Implala 3400 V6


the thermostat housing is located where the radiator hose connects to the engine. you'll need a flush kit to flush it out, it comes with instructions

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1 Answer

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The overheating will not have anything to do with the lost of power for cranking or the lights not working. Try charging the Battery and start over.

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This is usually the lower intake manifold gasket. The problem you are describing is due to a large air gap/bubble in your cooling line. This usually happens when the manifold gasket begins to fail.

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There's info online about doing it yourself, but it's a bit invlved if you are not a mechanic. Expect to pay from 800 to 1200 to get it fixed at dealer or mechanic.

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5 Answers

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