Take heads off and replace the gaskets. Make sure to check the heads for warping. Get a Haynes Manuel for step by step info.
On a 1995 Ford Aerostar : If it is the 4.0L EFI V6 engine ( like my 1995 Ford EXPLORER ) it has an " O " ring for the thermostat , there is no gasket But , if it is the 3.0L V6 engine I believe a thermostat gasket is used
The price varies for a head gasket by location for a 1991 Ford Aerostar van. The approximate price for the head gasket if you are going to do all repairs yourself is approximately $80.00.
The 1995 ford Aerostar did not come stock with a factory amp. If your van has an amp then it was added aftermarket.
What is the firing order for 1995 Ford Aerostar 30L and direction of rotation on distributor?"
Yes
My 1995 Ford Explorer has a diagram in the front of the engine compartment showing how the serpentine belt is routed . Does your Ford Aerostar not have that .
A ( 1996 ) Ford Aerostar has a ( 21.0 U.S. gallon / 79.5 litre gas tank )
On a 1995 Ford Aerostar 4.0 and 3.0 V6 engines : 3 - 6 2 - 5 1 - 4 front of vehicle
On the 1995 ford Aerostar, the speed sensor is located on top of the differential. It is a magnetic style, mounted close to the input shaft.
water in the oil, oil in the water, smoking while running, over filled oil with a weird color
A 1995 model would have an R-134a system.
the radiotor or the cams