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If the idler pulley is frozen, it is high time to replace the timing belt and the idler. And while that job is being done, consider replacing the water pump and thermostat.
in front of motor under the belt tenser
Not trying to be a smart a&^ but if you do not know that it is called a "Water Pump", you probably don't need to try and replace the belt. But basically you loosen whatever the belt is driving in addition to the Water Pump. Alternator, A/C compressor, Or P/S Pump. This will loosen the belt and allow you to replace it. Tighten the device you loosened until you have about 1/4" deflection at mid-point of the new belt. If you have one a serpentine belt with an idler pulley, then it is under tension by means of a spring loaded idler. Remove tension from the idler pulley and then remove the belt. Reverse to replace the belt. Tension is automatically adjusted. Check the condition of the idler once the belt is removed. Noisy, or rough turning idler should be replaced. Pay close attention the the routing of the belt. Take a digital photo if necessary.
In an Inline 6 Jeep engine, the idler pulley is located to the right of the A/C pulley. It is a smooth pulley, not a grooved one.
Most idler pulley's are near the top and usually quite easy to get to. Press on the belt somewhere, enough to deflect it a couple inches and watch to see which pully is mounted on a tension spring. That is the idler pulley.
Remove belt and check to see that it rotates freely and smoothly
There is no spring loaded tensioners on the Mercury Villager. Look for manual adjustments, loosen the nut in the center of the adjustment idler's and then move the adjustment bolts toosen the belts for replacement. Since this vehicle does not have just one long serpentine belt the routing is fairly simple to figure out. If the belts are still on the vehicle you can draw a quick sketch of the routing to help when re-installing the belts.
alternator-,ac pump-,steering pump-,crank pully-, idler pulley-,water pump
idler
Most technicians refer to the idler pully for the timing belt as just idler.
i dont really know-but to find out just look it up on google!
This is real easy on the 3.8 L engine Whether its front wheel drive or rear wheel drive all you have to do is locate your idler pulley and use a wrench that is the size of the nut on the idler pulley and move the idler pulley just enough to pull the belt off. Be careful to release the tention on the idler pulley slow it is under spring pressure. Use schematic under hood to put on new belt. This will take about 5 minutes to complete. Hope this helps.