Question about Chevrolet TrailBlazer

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Iv noticed oil in the coolant reservoir what could it be 02 trailblazer 4.2L any posible answers

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Depends on the type of oil in the reservoir!! Typical issues that will cause this on your 4.2L I-6 engine; 1. (usually pink/reddish oil) trans fluid leaking via faulty radiator, blown head gasket from overheating (severe), or someone accidentally added oil to your radiator!!

Posted on Sep 27, 2010

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Hello;

Oil in Coolant Resevoir or in Radiator, OR water in Oil =Indicates a Blown Or Cracked Head Gasket.

Thanks From: d-Hubbs

Posted on Sep 27, 2010

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94 Fleetwood lt1 brown crud in coolant reservoir


Looks like mud ? What type coolant have you added ? Take the radiator cap off an look into it , do you see the same ? Have you ever had the cooling system flushed ? There was a problem with people adding green coolant to GM - Dex-cool ,orange ! Clog's the passages in radiator ,inside the engine , heater cores etc... Pull the oil fill cap on the valve cover an look at the under side of the cap , do you see brown frothy looking goop ? Coolant getting into the oil ! Why it called DexKILL

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After many tries changing coolant sensors ect..on my 2002 trailblazer I have noticed oil in my coolant. Does this mean cracked head?


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There are a thousand answers for the temp sensor for a trailblazer. Can someone tell me or better yet, show me where the coolant levelsensor is?


This is not on the reservoir. The sensor when activated means that the coolant in the engine is low. Therefore the sensor is in the water jacket and depending on the model it can either be in the heads of the block.

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It sound like the transmission cooler inside the radiator tank is leaking into the coolant. You could try to fix it yourself, but without the proper tools the tanks are difficult to R&R. I'd try to take the radiator back to whoever you got it from.

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One thing to check is for coolant getting into the oil, which would indicate head gasket failure. Check oil dipstick and/or underneath of oil cap for a frothy brown/tan look to it. If so, do not drive the car.

Also check coolant reservoir for a leak. Evaporation is suspect, but maybe not to the point you are describing. Check coolant reservoir cap, as well as radiator cap.

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1 Answer

Loosing coolant from reservoir, dye in coolant did not turn up any leaks, no coolant in oil, what now?


Either the coolant system wasn't truely full. Meaning that after it is filled up while running, the radiator will eventually empty in to the engine block, then you will need to fill it up again. Unless you are burning it up, but since it is not in the oil, then I don't see any worries

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Oil in the radiator overflow reservoir


either a leaky head gasket or someone put oil in the overflow, it happens, clean it out drain the coolant from the entire system and refill with new long life antifreeze, also add a can of good radiator sealer.

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2000 Toyota Celica coolant reservior empty


I hate to tell you this but its possible...

You have a leak. Look around on the driveway and try to determine if you have an external leak as opposed to an internal leak. If you see no coolant on the ground, suspect a blown head gasket. Do not continue to drive this car in this condition. If it does indeed have a blown head gasket, serious engine damage will occur.

Check your exhaust for white smoke. Chances are good you have a blown head gasket and coolant is leaking into the engines combustion chambers and is essentially burning off. Also check your oil, if it looks like caf mocha, this will confirm coolant is leaking into the oil via the blown head gasket

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