My 97 blazer squealing has been driving us crazy with a

Pulleys also wear.
You've changed the belts - a workshop would then change that particular pulley, if asked to do so.

Start your engine, then put a few drops of water onto that pulley. Does the squealing noise disappear? If so, the pulley is slightly worn in the groove - and this happens to all vehicles.

Your option is to either replace that pulley or use a spray-on anti squeal compound.

Generic images below:
belt anti squeal Google Search

The belt has most likely moved either in or out on the bottom pulley. Check it first. I had the same problem it looked ok but was out one groove missleading designed pulley.

Bearings in Alternator, water pump, power steering pump or even a squeal from Vacuum line, EGR diaphram or similar. Check power steering fluid level.



Now when you replaced the tensioner, did you notice more pulleys that were just "there" and not connected to anything? These are idler pulleys and are helpful in routing the belt. They have bearings too!

Pleae rate my info.

yes, if it is frozen up the belt will squeal and burn up ! you can go to any auto parts store and tell them you need a idler pulley for your vehicle. good-day !

idler pulley or belt tensioner usually makes the squealing noise..put a long steel bar (extension) near the pulley and listen to the noise by putting your ear near the tool and you will hear it

Has it just started with cold weather? Does it squeal at first then as the engine is revved, stop squealing.

If so its probably your alternator belt has worked loose and needs tightening. I'd check this out first, if you've not done it before ask a friend with some know how for guidance. But as a guide, there should be about an inch of give when flexed on the longest run between 2 pulleys, if more then probably needs tightening. If more than a couple of years old, replace with a new one.

If it still squeals after tightening/replacing, you could have a faulty water pump bearing or pulley bearing. Either would require replacement to pre-empt catastrophic failure and resultant engine damage.

3.8L Engine

1. Insert a 1/2 inch flex handle in the square hole in the tensioner. The tensioner has a square hole cast into the rear of the tensioner body directly behind the pulley. Rotate the tensioner clockwise and remove the belt from the pulleys.
   

NOTE As an alternate method, a 16mm socket can be placed on the tensioner pulley bolt and rotated clockwise to remove the belt.

To install:

1. Following the schematic on the decal under the hood, loop the drive belt over all the pulleys except the alternator pulley.
   
2. With the belt installed properly on all except the alternator pulley, rotate the tensioner as described above and install the belt on the alternator pulley. Ensure that all the V-grooves make proper contact with the pulleys.
   

4.6L Engine
WARNING Do not allow the drive belt tensioner to snap back as damage to the drive belt tensioner or personal injury could result.

1. Rotate the drive belt tensioner clockwise with a breaker bar installed in the 3/8 inch square hole in the drive belt tensioner.
   
2. Lift the drive belt over the idler pulley flange and remove the drive belt.
   

To install:

1. Following the schematic on the decal under the hood, position the belt over the pulleys, except the idler pulley.
   
2. Rotate the tensioner as described above and install the belt on the idler. Ensure that all the V-grooves make proper contact with the pulleys.
   

here you go. please rate, thanks

Item Part Number Description 1 8620 Drive Belt 2 10300 Generator Pulley 3 6C348 Idler Pulley 4 6B209 Drive Belt Tensioner 5 3D673 Power Steering Pump Pulley 6 2E884 A/C Clutch Pulley 7 6A312 Crankshaft Vibration Damper Pulley 8 8A528 Water Pump Pulley
CAUTION: The drive belt tensioner has no provision for adjustment and will be damaged if forced to travel beyond its operating range. Automatic tensioners are calibrated at the factory to provide the correct amount of tension to the belt. There is no need to check tensioners for proper tension.
NOTE: Drive belts (8620) with automatic drive belt tensioner (6B209) do not require adjustment.
NOTE: When a drive belt is installed new or reinstalled after a service procedure, the drive belt does not fully seat into pulley grooves until engine has run for several minutes.
This vehicle is equipped with:

• a V-ribbed serpentine accessory drive belt.
• automatic drive belt tensioners.

New drive belts should be of the same type as originally installed.
Drive belt chirp is a regularly occurring chirping noise that occurs due to:

• pulley misalignment.
• excessive pulley runout.

It can be a result of a damaged pulley or an incorrectly replaced pulley that was not correctly aligned.
To correct drive belt chirp:

• determine the area where the noise comes from.
• check each of the pulleys in that area with a straightedge to the crankshaft pulley (6312) for front accessory drive and the water pump drive pulley to the water pump.
• look for the accessory pulley to be out of position in the fore/aft direction or at an angle to the straightedge.

Drive belt squeal is an intermittent noise that occurs when the drive belt slips on a pulley during certain conditions such as:

• engine start-up.
• rapid engine acceleration.
• A/C clutch engagement.

Drive belt squeal can occur under the following conditions:

• The A/C discharge pressure goes above specifications:
  • The A/C system is overcharged.
  • The A/C condenser airflow is blocked.

2 valve





Item Part Number Description 1 8679 Belt idler pulley 2 10344 Generator pulley 3 8620 Drive belt 4 3A733 Power steering pump pulley 5 6312 Crankshaft pulley 6 8509 Water pump pulley 7 2E884 A/C clutch pulley 8 6B209 Drive belt tensioner pulley
------------------------------------------------------------------------
4 valve


Item Part Number Description 1 19A216 Belt idler pulley 2 10300 Generator clutch pulley 3 8620 Drive belt 4 3A733 Power steering pump pulley 5 6316 Crankshaft pulley 6 8A528 Water pump pulley 7 19D692 A/C clutch pulley 8 6B209 Drive belt tensioner pulley 9 19A216 Belt idler pulley

Drive Belt Replacement WARNING: IF EQUIPPED, DO NOT ALLOW DRIVE BELT TENSIONER (6B209) TO SNAP BACK AS DAMAGE TO DRIVE BELT TENSIONER OR PERSONAL INJURY COULD RESULT.
NOTE: Minor cracks in the V-grooved portion of the serpentine drive belt (8620) are considered normal and acceptable. If the drive belt has chunks missing from the ribs, the drive belt should be replaced.

NOTE: Conditions requiring drive belt replacement are excessive wear, rib chunk-out, severe glazing, frayed cords or other conditions. Replace any drive belt exhibiting any of these conditions.

NOTE: When installing drive belt on pulley, make sure that all V-grooves make proper contact with pulleys.





Drive Belt, Serpentine—Except SHO
Removal

1. WARNING: USE CAUTION WHEN REMOVING OR INSTALLING DRIVE BELT TO MAKE SURE THAT TOOL DOES NOT SLIP FROM DRIVE BELT TENSIONER OR PERSONAL INJURY AND/OR DAMAGE TO DRIVE BELT TENSIONER AND DRIVE BELT MAY OCCUR.
   Using a 15 mm socket or wrench on bolt attaching drive belt tensioner pulley, rotate drive belt tensioner clockwise on 3.0L (2V) and 3.0L (2V) FF, rotate the drive belt tensioner counter clockwise on 3.0L (4V) to remove drive belt from pulleys. Make sure spring keeper engages into slot.
   
   
   Drive Belt Tensioner—3.0L (4V)
   
   
   
   
   

Installation

1. Install drive belt over all pulleys (except drive belt tensioner).
   

1. Rotate drive belt tensioner as described under the removal procedure and install drive belt over drive belt tensioner pulley. Make sure that all V-grooves make proper contact with pulleys. Make sure spring keeper releases or improper belt tension will occur.
   
   
   Pulley, Routing—Accessory Drive Belt 3.0L (2V)/3.0L (2V) FF Engine
   
   
   
   
   
   Item Part Number Description 1 10300 Generator 2 6C348 Idler Pulley 3 3A674 Power Steering Pump 4 19703 A/C Compressor 5 6312 Crankshaft Pulley 6 6B209 Drive Belt Tensioner 7 8501 Water Pump 8 8620 Drive Belt
   
   Pulley, Routing—Accessory Drive Belt 3.0L (4V)
   
   
   
   
   
   Item Part Number Description 1 3A674 Power Steering Pump 2 8501 Water Pump 3 19703 A/C Compressor 4 8620 Drive Belt 5 6312 Crankshaft Pulley 6 6B209 Drive Belt Tensioner 7 10300 Generator

3.4L SHO Engine
Removal

1. Remove the right front wheel and tire assembly. For additional information, refer to Section 04-04.
   

1. Remove the inner fender splash shield.
   

1. Remove the alternator shield.
   

1. WARNING: USE CAUTION WHEN REMOVING OR INSTALLING DRIVE BELT TO MAKE SURE WRENCH DOES NOT SLIP FROMDRIVE BELT TENSIONER OR POSSIBLE PERSONAL INJURY AND/OR DAMAGE TO DRIVE BELT TENSIONER AND DRIVE BELT MAY OCCUR.
   Using a 3/8 inch ratchet on the lifting lug, rotate drive belt tensioner counterclockwise (upward) and engage spring keeper. Remove drive belt from drive belt tensioner.
   

1. Lower vehicle.
   

1. Remove drive belt.
   

Installation

1. Install drive belt over all pulleys (except drive belt tensioner ).
   

1. Raise vehicle on hoist.
   

1. Rotate drive belt tensioner , as described under Removal procedure and install drive belt over drive belt tensioner pulley. Make sure all V-grooves make proper contact with pulleys. Make sure the spring keeper is released or improper belt tension will occur.
   

1. Install the alternator shield.
   

1. Install the inner fender splash shield.
   

1. Install the wheel and tire assembly. For additional information, refer to Section 04-04.
   
   
   Pulley Routing—Accessory Drive Belt, 3.4L SHO
   
   
   
   
   
   Item Part Number Description 1 3A733 Power Steering Pump Pulley 2 6B217 (RH) Idler Pulley 3 19703 A/C Compressor 4 8620 Drive Belt 5 6312 Crankshaft Pulley 6 6B209 Drive Belt Tensioner 7 10346 Generator 8 6B217 (LH) Idler Pulley 9 6B217 (Center) Idler Pulley

Drive Belt, Water Pump
Removal

1. NOTE: If removal of the water pump drive pulley is required, refer to Section 03-03.
   
   Rotate drive belt tensioner clockwise by hand and remove drive belt from drive belt tensioner .
   

1. Remove drive belt from water pump drive pulley and water pump pulley.
   

Installation

1. Position drive belt onto water pump drive pulley and water pump pulley.
   

1. Rotate drive belt tensioner clockwise by hand and install drive belt over top of drive belt tensioner pulley. Make sure all V-grooves make proper contact with pulleys.
   
   
   Pulley Routing—Water Pump Drive Belt
   
   
   
   
   
   Item Part Number Description 1 6B209 Drive Belt Tensioner 2 6A312 Crankshaft Pulley 3 8501 Water Pump 4 8620 Drive Belt