Question about 1999 Chevrolet Astro

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Leak There is an oil leak that the mechanics state they can't find. I have to replace the engine oil once a month. I know when the oil is really low because the heater goes out and only blows cold air. What is wrong with the car? The van also has difficulty starting when wet outside.

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  • yadayada
    yadayada May 11, 2010

    you say the heater goes out, this is not an oil leak but a coolant leak that would cause this issue..

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An oil leak that a mechanic cannot find? Find a new mechanic.

Okay, are you saying this is leaking a quart or more a month? That is a LOT of oil.
Oil does not evaporate. (Okay, yes, oil does evaporate, but so slowly that it is not going to be noticable in a vehicle). That said, the oil is going somewhere.

* Is it leaking on the ground? If so, then the oil will be visible the next day -- somewhere, either on the ground, or on some part of the frame. However, it will be visible.
* Is it a blown headgasket? If so, then the radiator fluid will be oily. Not good.
* Is it leaking into the transmission? Very unlikely, but in some applications is possible (not sure specifically about the 1999 Astro). However, this would be noticable as oil in the transmission.
* Is it blowing past the rings? If so, then the inside of the tailpipe will likely be sooty.

The oil is definitely going somewhere. I'm looking forward to hearing where!

--Mark

http://www.marksatterfield.com

Posted on Feb 10, 2009

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