Astro 1985-2005
Chevy's first entry into the minivan class, offered in All Wheel Drive to add to its versatility.
Platform: M-Body

Oil in Radiator

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Old October 24th, 2011, 2:45 PM
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Unhappy Oil in Radiator

How can oil get in a radiator of this van when the transmission and oil dip sticks show clean oil? 2000 Engine Type 4.3L V6 OHV 12V
Make Chevrolet Driveline RWD
Model Astro

The oil keeps coming in the radiator but the when checking the oil with the diop stick as well as the trasmission oil it is also clean not milky at all. How would it get in?

Last edited by butch171; October 24th, 2011 at 2:47 PM.
Old October 24th, 2011, 8:31 PM
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The oil pressure is higher then the pressure in the rad.
Old October 25th, 2011, 4:41 AM
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The oil pressure is going to be higher than the radiator. My bet is transmission fluid.
Old October 25th, 2011, 5:12 AM
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Astro are equipped with both oil and transmission coolers in the radiator. While I haven't experienced it myself, I have heard in other vehicles of these coolers leaking into the radiator.

The other thing it may be is the beginning of the head gasket going, sometimes a small leak will flow one way.
Old November 3rd, 2011, 1:38 PM
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Originally Posted by butch171
How can oil get in a radiator of this van when the transmission and oil dip sticks show clean oil? 2000 Engine Type 4.3L V6 OHV 12V
Make Chevrolet Driveline RWD
Model Astro

The oil keeps coming in the radiator but the when checking the oil with the diop stick as well as the trasmission oil it is also clean not milky at all. How would it get in?

Well, water is heavier than oil and it may be setting bellow the dipstick level.
When the oil is changed it may show.
Head gasket and water pump gasket are 2 that I can think of for the moment.
Old November 3rd, 2011, 1:50 PM
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Aaron is absolutely right. However, once the oil get into the radiator, it will travel and still get into engine water jacket. My advice is get it done as soon as possible. If water gets into oil it may freeze the engine!
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