Can I use the no ac diagram and use that belt on the car if I have a/c to bypass a/c compressor.

That's not the way it works. You purchase a Bypass Pulley and fit it where the compressor was. Same belt routing and length.

https://www.google.com/search?q=1998+Mercury+Grand+Marquis+bypass+pulley
..

No, because the routing doesn't work out right.

https://www.2carpros.com/diagrams/ford/taurus/2002

So they sell Bypass pulleys and you just use the same belt.

https://www.google.com/search?q=2002+ford+taurus+3.0+l+AC+compressor+bypass

..

You can't buy a belt to do that, you must use the same belt and install an AC bypass pulley where the AC compressor used to be. If the dealer can get it, it will be called an "AC Delete" pulley. It is also made by an automotive parts manufacturer called DORMAN, check with a local auto parts store, not Autozone.

I have a 2000 E430. I just did this job because my ac compressor froze. I went to O'reilly and bought a serpentine belt 6pk2310.(different brand has it as k0910). The numbers after the part number is the length in mm or inches. Eg. 0910 = 91 inches == 2810mm. Just follow the diagram and bypass the ac compressor. Tools: 15mm wrench for the pulley tensioner. It took me 5 minutes to do this job and be on the road again. It is very easy.
On the Right is the normal diagram.

On the left is how you bypass the AC compressor on a E320/E430 2000-2002 engine.

I don't think you can bypass the compressor.
Chrysler would have to build a model without ac and as far as I know they all have ac.
When they do have an engine without ac they usually have an idler pulley to take the place of the compressor.
Re-routing the belt runs the risk of turning the alternator or water pump in the wrong direction.

You can bypass the ac compressor by using a 82" belt. Feed the belt from the back of the engine at the water pump. Disconnect the power steering line at pump. It's a lot easier if you use some type of hook to hold/maneuver the belt. (I used a bent rebar) Follow this routing diagram I created. Bam! No more ac problems!

On an AC compressor unless you are willing to take your car to a repair shop to replace the compressor then you will want to bypass the commresor, the same belt can be used the, diagram for it should be on/or near the hood or body of your car it will show you how to bypass the compressor.

PS: If you do not replace or bypass the compressor, it can if i remember right can cacth on fire. Either way it is bab to keep a compressor on the belt drive if it broken

Click on the following Link. It has the two (2) Serpentine Belt Diagrams.

I believe the Mechanic is bypassing your AC Compressor.
When you look at both of the Belt Routes you can bypass the AC with the shorter belt.
In the first Diagram: the Belt would go from the Power Steering Pump, bypassing the AC and going directly to (over the top) of the Water Pump.
In the second Diagram: the Belt would go from the Tensioner, bypassing the AC and going directly to (under the bottom) of the Water Pump.

Let me know if this helped, or if you have additional questions or information. Feel Free to contact me at FixYa.com!
http://www.2carpros.com/car_repair_information/year/2004/make/jeep/model/grand_cherokee/2004_jeep_grand_cherokee_drive_belt_routing_diagram.htm

its the same. but a different pulley takes place of the a/c compressor. I know DORMAN makes a few "bypass pulleys" to do this, but dont know if they make one for your truck. at the worst... you will need to get a pulley and bracket from the dealer for a truck without a/c . as long as your a/c pulley bearing is ok, you can let the belt run there.

the belt diagram for with ac and without ac is the same, there is a ac bypass pulley bolted where the ac compressor would be, you can buy these pulleys from the dealer