Go to this web page and read this article: http://www.rsgear.com/articles/2004_10.pdf this should answer your question. Your van has the New Venture 136 transfer case. I have the same problem. This info is important. for all Astro/Safari AWD owners.
On a 2004 Chevy Astro, the camshaft sensor is located in the front of the engine. It is on the left side of the timing cover behind the camshaft sensor.
I contacted the Chevy Dealer and he informed me that the Chevy astro van has a timing "chain", not a timing belt and requires no maintanence action for this item.
The 2004 Chevrolet Astro computer is located behind the passenger side dashboard. You will need to remove the glove compartment to access the computer.
Attached to the side of the throttle body.
At the rear of the engine next to the distributor.
26 gallons according to the manual
Cheapest returnable answer is to remove the bulbs
where is the flasher unit on a 2004 Chevy classic? where is the flasher unit on a 2004 Chevy classic and could it be causing the clicking noise in the dash?
you can reach them by removing the tires and the wheel well guards [plastic]
where is the oxygen sensor in a 2004 astro van
Astro Battle happened in 2004.
Trouble code P0128 means:Coolant thermostat (coolant temp below thermostat regulating temp)