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You didn't say if you mean the auto tensioner of the auxiliary belt. Assuming this is so, I don't know but just wanted to mention not all vehicles use an auto tensioner and a significant number have to be manually adjusted.
Auxiliary belt adjusters have been increasingly deleted over the last decade or so - replaced by a stretchy belt. These belts can be removed and refitted but they are a struggle.
Recommendation is they are cut off when removal is necessary and replaced with new - a tool to aid fitting is supplied with a new belt.
there is a bolt attached to the idler arm, if you get the right size socket and a good wrench, you have to pull the idler arm. it will pull the entire tensioner and the belt will be loose
Yes you adjust the belt tensin by adjusting the alternator. the one with the 14mm head is the pivot and the one with the 12mm head is the lock down bolt.
Use a breaker bar to release the tension on the old belt. Remove the old belt. Use the breaker bar again to pull back the belt tensioner and install the new belt following the pattern listed on the sticker that should be on the underneath of the hood or nearby.
take a look some pullies are spring loaded and it may require a ( not recommend unless stuck) but a pry bar. if spring loaded is the case there should be a tool that you could rent that is use for prying the pulley.
Note: make sure to release slowly so not to damage pulley.
-disconnect battery (-) terminal.
-remove plastic cover to the left of the radiator(when looking from the front)
-loosen off 12mm bolt from top of alternator
-loosen off 14mm bolt from bottom of alternator
-disconnect wiring harness at alternator and remove 10mm nut holding the main wire.
Push alternator towards engine to slacken belt tension, then remove belt
-finish removing 12mm and 14mm bolts and remove alternator from the car.
-Replace in reverse order.
When tightening belt tension becareful what you pry against. You can easily damage the oil control solenoid the controls the camshaft.
that belt is wrapped around the alternator which is located on the passenger side of the engine compartment. loosen the alternator to remove belt. Wrap belt around pulleys and pull the belt tight but adjusting the alternator.
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