Which pulley is the idler pulley on a 2001 isuzu trooper 3.5L,DOHC motor?

Either your blower motor or blower motor resistor is probably fried. I would hedge towards the resistor.
https://www.partsgeek.com/catalog/2001/isuzu/trooper/climate_control/blower_motor_resistor.html

just to end this ever lasting post
see the 2 engines, ill toss coin, land on V6 3.2L
http://www.rockauto.com/en/catalog/isuzu,1997,rodeo

cam drive,or acessory drive, tension?
http://www.isuzuparts.com/partscat.html



this is the v6, accessory belt tensioner
cam is whole other matter.
next is the v6, cam tensioner
#20 seen on the REAL isuzu site.
both have idler pulleys, so next time say what your hands are
cam or acessories

Click on link to view.http://www.autozone.com/autozone/parts/Duralast-Idler-Pulley/2000-Isuzu-Rodeo-2WD/_/N-jeeaaZ8gd4q?itemIdentifier=634079_30706_0_

the timming gear that the belt runs on has a mark (V cut in gear) to rear cover at about 12 o clock and crank pulley has timming mark for top dead centre, both cams have cut outs in rear that a special tool (camshaft stopper 5-8840-2592-0) locks into to hold cams in correct position, but can do without this, if the cam belt gear is off, the keyway should be at 12 o clock. the marks in the camshaft gears (dots) is for assembly of sissor gears to solid gears on camshafts that run together and they should match up only if you had this appart.

no.1 is timming mark

this is the locking plate tool

any further symptoms and information would be handy

The Isuzu 3.5's all burn about 1 quart between oil changes. It was an engineering flaw with that model engine. Some people have said that running full synthetic oil will correct the problem over time. Either way, it is extremely important that you check your oil regularly.

As for you second question: Torque on demand has at its heart wheel speed sensors which typically are the issue. Having a wheel speed sensor replaced will set you back about $300.

I hope I was helpful.

Click on the following free, direct Link. It has the Belt Diagrams for your 1996 Isuzu Trooper with the 3.2L DOHC V6. It also has the positioning for what Belts go where on the Crank Pulley.

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

http://www.2carpros.com/car_repair_information/year/1996/make/isuzu/model/trooper/1996_isuzu_trooper_drive_belt_routing_diagram.htm

I had the same problem when trying to replace the serpentine belt on my 2001 Trooper. The Maintenance book was very vague and I couldn't tell exactly how the tension was taken off the belt, but it did clearly identify the tensioner pulley. I first removed the pulley and looked for some kind of slot that would give me the adjustment I needed, but no slotted adjustment is present on the 01 Trooper. I had to do some research so I pulled of the tensioner assembly and found that there is a spring coil which keeps tension on the belt constant, and eliminates any belt alignment problems.

The Litens style tensioner uses a spring to apply pressure towards the serpentine belt. The way to relax the spring is to use your 14mm socket and ratchet and force the pulley down by driving the pulley nut in the clockwise direction. This forces the spring to compress and the pulley to drop giving the needed clearance to get your new belt in place.