More than likely your intake gasket is At Fault cusing the leak. This is common on 4.3 v6 engines.
Under the hood on the passengers side next to the evaporator on the firewall.........
How do you remove the dashboard fascia on a 1999 Chevy Astro?
Is it bolted or riveted . Drill out the rivets and use bolt on the new motor.
I had an issue today and so I found where it is. It is along the engine on the passenger side just in front of the Transmission on the very bottom of the motor. FYI
It will work as long as it fits.
The PCV valve on a 1999 Astro should be located on top of the valve cover. It plugs in and can be easily replaced.
The 1999 Chevy Astro horn relay switch can be found on the back of the horn. The relay switch will be attached to the horn with two retaining screws.
Astro lounge was released March of 1999
To the left of the water inlet housing (thermostat housing) on the intake manifold
.60
Start by checking the "Motor encoder unit" on the all wheel drive system.
the firing order is 165432