Hi,how do you change engine belt of 2000 venture ?

On the high pressure side of the system on the line that goes into the evap just at the engine compartment firewall. Sometimes it is wrapped with an insulation and is hard to find.

This engine is freewheeling, as requested by Ford for the joint venture program with the Mercury Villlager. So, no engine damage if timing belt breaks. Just install a new belt and maybe the water pump while you are therre and new other belts. It will run another 100,000 miles.

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pump runs on belt in front of engine as shown. open cap, fill to range on short dipstich attached to cap.

from AutoZone.com
Fig. Accessory drive belt routing-3.4L engine

1. With the ignition key in RUN but the engine off, fully push and release the accelerator pedal slowly three times within five seconds.

2. Turn the key to off.

IF the CHANGE ENGINE OIL light comes back on, the engine life monitor has not reset. Repeat the procedure.

I have noticed personally that I have press my accelerator 5 times. Each vehicle has it's own idiocyncracies

My sincere apologies for the delayed response.
I am personally going back to answer your unanswered questions.

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.

I am assuming this "van" is a Chevy Venture?
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/2000/make/chevrolet/model/venture/2000_chevrolet_venture_drive_belt_routing_diagram.htm

Hello warrenmeriwe: My name is Roger and I will help you. Please see the attached picture. Please rate the quality of your response. This way we can tell your answer was correct. Please just ask should you need further help. Thank You for using Fix Ya. Roger

If you look at the engine and see some tubes attatched to the exhaust manifolds ( these are called asperator tubes) follow the hose( usaualy a heavy duty rubber hose it will lead you to the pump. also you can see it from the front of the motor it is driven by the belt . ( cooling fan belt or the Harmonic ballancer belt ) .

. With the ignition key in RUN but the engine off, repeatedly push the trip/reset button until OIL is displayed on the Driver Information Center. 2. When OIL is displayed, push and hold the trip/reset button for five seconds. The number will disappear and be replaced by 100 (indicating 100% oil life remaining). 3. Turn the key to OFF. If the change engine oil message comes back on, the engine oil life monitor has not reset. Repeat the procedure

THERE SHOULD BE A HOLE WHERE THE DOWEL PIN GETS INSERTED. I BELIEVE THE PULLEY GOES ABOVE THE TENSIONER. HOPE THIS HELPS. GOOD LUCK. THANK YOU IN ADVANCE FOR AN HONEST RATING AND FOR USING FIX-YA. KEEP ME POSTED PLEASE