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The pulley on my BMW E90 330D that drives the belts is standing still. As soon as I put the aircon on the pulley driving the belts stands still. What could be the problem?

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: BMW X3 aircon belt problem--keeps jumping out of crakshaft pulley

if air con belt runs off the pulley inspect the crankshaft damper pulley, it may be broken!
the air cond belt is a stretch belt with no tensioner!

Posted on Aug 23, 2010

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Ironfist109
  • 3018 Answers

SOURCE: The problem with my '98

  • Hi, I can help.

  • This is your AC compressor and as the clutch engages and disengages it will appear to be spinning with the belt sometimes and other times not. As long as the belt is not squawking at you (indication of a pulley not turning) then this is normal and you have nothing to worry about.


  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Regards, Tony

Posted on Sep 24, 2011

  • 430 Answers

SOURCE: I bypassed the aircon when I replaced the drive

Timing belt routing diagrams for cars and trucks? Click the link below:--- http://technoanswers.blogspot.com/2011/10/timing-belt-routing-diagrams-for-cars.html

Drive belt routing diagrams for cars and trucks? Click this link below:--- http://technoanswers.blogspot.com/2011/10/drive-belt-routing-diagrams-for-cars.html

Posted on Oct 31, 2011

  • 3 Answers

SOURCE: how to fit aircon drive belt x5

take it to the shop

Posted on Apr 24, 2012

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1 Answer

What drive belt do I use on my 05 vx sv6 if I remove the aircon unit


if the pulley on the ac is still good ( bearing ok) then pull the ac fuse for the compressor and use the standard belt
the pulley for the compressor just becomes an idler
the other way is to use a tape measure around all the pulleys and idlers and the measurement will be a starting point for the length of the belt
go to a service dealer spares, and see if there is a listing for a belt for a vehicle that doesn't have ac

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Serpentine belt diagram mazda


2012 Mazda 3 I touring Skyactiv - Takes a 38" 6 groove serpentine belt- Very hard to find. The only place I found besides the dealer it Advance Auto but they had to order from the warehouse. There are three grooved pulleys and a smooth tensioner. To relieve the Tensioner you will need a shallow 17MM socket, it is a bit difficult to see, but if you stand on the passenger side the mount point for the socket is to the left of the tensioner shock. The Tensioner shock is just above the smooth tensioner pulley. All the threaded pulleys' (Drive, A/C, and alternator are within the serpentine belt, the tensioner pulley is outside the belt pushing down on the belt. The easiest way to replace this belt, First remove the old belt by placing the socket on the mount point and pulling up on the ratchet towards the rear of the car, then pull belt off. Next remove socket, place the belt over the drive pulley (this is the one on the bottom to the rear of the engine. ( you will see there is another belt on this pulley on the back side.), then put the belt over the A/C pump bottom front. Keep tension on the belt so it stays in place. Now put that socket back on, push up to lift the tensioner pulley and slip the belt over the alternator pulley. Make sure the belt is sitting properly on each pulley and under the tensioner pulley. Good luck. I have run into quite a few problems finding parts and information for this particular model. Good luck. Hope this was helpful

Apr 11, 2014 | 2012 Mazda 3 i Touring 4dr Hatchback 2.0L...

1 Answer

Serpatine belt comes off buick park ave. when driving through standing water


My bet is that one of the pulleys is misaligned. Could possibly be on the belt tensioner. Have you tried a new belt tensioner?

Also make sure the other pulleys do not have ANY play in them. Take the belt off and by hand check to see if you can wobble any of the pulleys.

If the shaft of any pulley is not perfectly aligned with the other pulleys, that pulley could cause the belt to slip off. Has the alternator, power steering pump, AC compressor been worked on or removed just prior to this happening? One of those might not have been reinstalled perfectly. A washer that is missing or in the wrong place can cause a belt to drift.

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Serpentine belt tore while driving bmw e38


The top small pulley backed it's self out. The problem is in most cars the pulleys are reverse threaded so this wont happen, in ours not so much. The pully spins loose with the turn of the belt so it has to be tightened way down. IT's a pain. Here is a diagram I found and You need a 15mm wrench, which doesn't just come in most sets. Good Luck

The book says "Using a 15 mm socket or wrench on bolt attaching drive belt tensioner pulley, rotate drive belt tensioner clockwise. Make sure spring keeper engages into slot." I would put a socket on the 15 mm pulley bolt and a long handle for leverage. Thats one tight spring.

Oct 12, 2012 | BMW Cars & Trucks

1 Answer

Engine light blinks on and off when I am driving not when standing still with motor running


More than likely is a glazed fan belt. At idle there's not alot of strain/pressure on it. When you're driving belt is pulled much harder. A glazed/smooth belt will silo over pulleys showing low charge triggering your light.

Feb 27, 2011 | 2000 Ford Windstar

1 Answer

How can i replace fan belt for a 2000 ford focus 16 v zetec and how the fan runs on polley?picture show.


      • Things You'll Need:
      • Wrench set
      • Jack
      • Jack stands
      • Socket set
      • Ratchet
      • 1/2-inch drive breaker bar


    1 Open the hood of your Focus and locate the negative battery cable at the battery. Loosen the clamp bolt on the battery cable end with a wrench, then lift the battery cable off the battery terminal. Isolate the battery cable from the battery terminals by tucking it off to one side.
  • 2

    Position a jack under the front of the car and raise it off the ground. Support the car with a set of jack stands, placing them under the front suspension. Lower the jack until the car is resting on the jack stands.

  • 3

    Locate the splash shield in the passenger's side wheel well and remove the two retaining bolts that secure it, using a socket and ratchet. Remove the splash shield from the wheel well and locate the serpentine belt tensioner through the access hole.

  • 4

    Insert the square drive of a ½-inch drive breaker bar into the square hole on the tensioner and rotate the tensioner counterclockwise, releasing the tension on the belt. Remove the belt from the pulleys and rotate the tensioner back to the home position.

  • 5

    Position a new belt in the engine compartment and run it around all of the pulleys except the tensioner's idler pulley. Rotate the tensioner counterclockwise with the breaker bar and then slide the belt under the idler pulley.

  • 6

    Slowly rotate the tensioner back to the home position, tightening the belt as you rotate it. Remove the breaker bar, then replace the splashguard in the wheel well. Install the two retaining bolts and tighten them with a socket and ratchet.

  • 7

    Raise the front of the car off the jack stands with a jack, remove the stands from under the car, and lower the car to the ground. Install the negative battery cable on the negative battery terminal and tighten the clamp bolt on the cable end with a wrench.

  • Nov 30, 2010 | 2000 Ford Focus

    2 Answers

    BMW X3 aircon belt problem--keeps jumping out of crakshaft pulley


    if air con belt runs off the pulley inspect the crankshaft damper pulley, it may be broken!
    the air cond belt is a stretch belt with no tensioner!

    Jan 21, 2010 | 2005 BMW X5

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    Need to remove the drive belt on a 2000 Sentra


    is there two belts on this car one for the alternator and a/c, and then one for the p/s. the one for the alternator look down from the alternator you will see a stand alone pulley not mounted to anything this is the tensioner/idler pulley loosen the nut on the pulley and then you will see an adjustment screw coming off of it turn it in and this loosens the belt up.

    Aug 29, 2009 | 2000 Nissan Sentra

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