Replacing a head gasket is a rather lengthy process, much too long to try to detail in this space. I would suggest that you consult a factory service manual, Chilton or Haynes manual.
According to my Chilton's auto repair manual : For a 1987 Chevrolet Celebrity with the 2.8 liter V6 engine : ( the engine cooling system capacity is 12.6 U.S. quarts )
The fuse block on Chevy Celebrity is on the bottom of the dash to the right of the steering column.
The 4.3 liter Chevy Astro head gasket torque specification is 160 pounds. The head gasket bolts should be torqued in 40 pound intervals.
most likely an intake gasket
About 450.00
The firing order for a 2.5L 4 cylinder engine is: 1-3-4-2
The pcv is located on either valve cover or the intake.
most Chevy cps's are located in the timing cover(behind the balancer). I'm not certain on the Celebrity, but it would be a good place to check.AnswerOn my 1986 Celebrity 2.5, it is beneath the intake manifold on the back of the engine.
I believe that one sits under the coil packs.
The fuse panel on Chevrolet Celebrities is on the bottom of the dash to the right of the steering column.
Under hood fuses are generally located next to the relay they are for.
Cracked cylinder head, blown head gasket, engine block or intake gaskets.