I need a belt routing diagram for a GM 4.1 without airpump and belt size would also be helpful.

There's a routing diagram sticker under the hood. Look for it on the radiator support , the front shock tower or on the hood itself.
type this on google and see what you get...gmc k1500 serpentine belt routing diagram

GATE A GATES CATALOG FROM AUTO PARTS DEALER,THAT SHOW ROUTING DIAGRAMS FOR SERPINTINE BELTS & TIMING BELTS,SHOWS YOU THE ROUTING FOR ALL FROM 4 POINTS TO 6 OR 8 POINT CONTACTS OR GO TO GM WHAT EVER IS EASIER

how do you route a serpentine belt for a 1988 chevrolet 350 ci with a ac. and airpump 2500 series truck

Your car could have a 2.2L engine or a 2.3L engine, so here's both, hope this helps you.

Okay, there are a few engines that come in this van, lucky there the same except,they come with or without ac or airpump, so i will give you all of them and you choose the right one.

Not sure of your engine size since you didn't post it so please the applicable one for you. Also, please don't forget to rate! Thanks!


Serpentine drive belt routing with A/C-GM 2.2L engine


Serpentine drive belt routing without A/C-GM 2.2L engine


Serpentine drive belt routing-GM 2.4L engine

okay....here are some drawings....since I don't know your engine size, please choose the correct one below:


Drive belt routing-2.0L SOHC engine with A/C


Drive belt routing-2.0L SOHC engine without A/C


Drive belt routing-2.0L DOHC engine

Like a lot of people...you didn't post your engine size....so out of these 11 photos, please choose the correct one for your application:


Accessory drive belt routing—1.8L (AEB/ATW/AWM) engines


Accessory drive belt routing—1.8L (AWP/AWV/AWW) engines 2.0L (AEG/AVH/AZG/BDC) engines without A/C


Accessory drive belt routing—1.9L diesel (ALH) engines without A/C


Accessory drive belt routing—1.9L diesel (ALH) engines with A/C


Accessory drive belt routing—1.8L (AWP/AWV/AWW) engines 2.0L (AEG/AVH/AZG/BDC) engines with A/C


Accessory drive belt routing—2.0L (ABA) engine without A/C


Accessory drive belt routing—2.0L (ABA) engine with A/C


Accessory drive belt routing—2.5L (BGP) engine with A/C


Accessory drive belt routing—2.8L (AFP/BDF) engines


Accessory drive belt routing—2.8L (ATQ) engines


Accessory drive belt routing—4.0L (BDP) engine

You didn't list your motor size so please pick the applicable diagram:


Accessory serpentine belt routing—4.8L, 5.3L & 6.0L engines


Accessory serpentine belt routing—5.7L engines with A/C


Accessory serpentine belt routing—5.7L engines without A/C


Accessory serpentine belt routing—6.5L Diesel engines


Accessory serpentine belt routing—7.4L engines


Accessory serpentine belt routing—8.1L engines

My sincere apologies for the delayed response.
I am personally going back to answer your unanswered questions.
I have only been a free contributor to this site for the past 4-months.

I do not know if you still need this information, but I am going ahead and answering it anyway.

CLICK on the following LINK. It has the Belt Diagrams you will need.

If you would: Before Clicking: Let me know if this helped you, or if you have any additional information or questions. Feel Free to contact me at FixYa.com!

Again my apologies....
http://www.2carpros.com/car_repair_information/year/1999/make/chevrolet/model/suburban/1999_chevrolet_suburban_drive_belt_routing_diagram.htm