SOURCE: 2000 GMC Sonoma 4.3l V6 timing chain replacement
Sounds to me someone wants to make a couple of bucks. Does the truck still run? The timming chain is going to have play in it, even with only a few miles on it THATS JUST THE NATURE OF THE BEAST, the chanses of the timming chain going out is remote, I've owned a few 4.3's with well over 100.000 mi. and never had to chg. a timming chain, not to say it can't happend just saying its very remote.
SOURCE: How to replace timing chain
It is where the two white marks on the upper and lower sprockets.
SOURCE: Replacing heater core in 2000 GMC sonoma. Dash is
If the dash is removed you've saved about 9 10ths of the job endurance. Look around, what you believe to be, the perimeter of the heater box. I cannot, and no one else can, tell you exactly where the bolts and nuts that mount the heater box are. Therefore you must viually sixe the box and check outide in the engine compartment and inside under the dash for the mounting bolts.You'll want to start by removing the heater hoses. Then starting at the passenger side engine compartment look for a group of 10mm or 7/16ths nuts retaining the housing and remove them. Do the same inside. The housing is usually held together with screws or clips, it changes year to year. Keep a log or pix of the wires and cables and hoses(vacuum) that are connected to the housing for reassembly. You'll need to "roll" the box out from under the dash depending on how much of the dash has been removed. The core is easy to spot for is has two hoses sticking out, and, is encircled with clips or screws . Also make sure you remove the bracket around the two entry hoses if it has one. Thank you, Dana
SOURCE: how do I install starter for 2000 GMC Sonoma
the starter will be located on the lower right side of the engine and it is located near some key components for your vehicles ignition system. If you do not consider yourself at least a "B" level technician, I would suggest that you take it to a nearby shop in which u trust.
SOURCE: Need serpentine belt diagram
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. You may want to Print the Diagrams for future use.
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/1991/make/gmc/model/sonoma/1991_gmc_sonoma_drive_belt_routing_diagram.htm
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