89' RAMGER S - LEFT FRONT BRAKE DRAGGING

Sounds like problem gone when AC clutch disengaged when switched off. Could be AC pump belt burning from seized or the belt slipped drastically. Is the smell like burning rubber or oil?
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does the roar change with left or right turns? most likely a wheel bearing, Dodge has poor front ends. or..is the brake dragging? the rotor would be hot after driving, discolored, smoking.

wheel bearing going down do not drive this car till its fixed. it can cause you to wreak catch afire ect

caliper malfunction brake fluid leak onto the pads causing it to slip and smoking from the brake fluid burning

Are you saying the truck still pulls left and the pads are hot after replacing the caliper ? And yet the brake pads are not dragging ?

your brake caliber is hanging up not releaseing you'll have to replace the caliber and then bleed the brakes.have a nice day.

my best guess would be a brake pad or caliper that is sticking on the "on" position. This will cause the brake to generate a high amount of heat and it will heat up the lugnuts. the smell should smell like burning brakes because that is what is happening. the smell itself is hard to describe . if it gets extremely hot you will see smoke coming from the brake that is not working correctly. if it is one brake doing it the steering should also "pull" to the side of the problem. right wheel brake dragging will cause the vehicle to "pull" or verr to the right side.

Suspects will include air supply, compression, and exhaust.

After ruling out the obvious basics (fresh air filter, unobstructed air intake) pull the wire clip to the auto-choke and idle for a few seconds before dropping it in gear to check for a change in power.

*Have you pulled the rear wheels to check for a binding E-brake or broken springs in the drums?
What feels like a left-front drag could also be a rear dragging...

*Has it been smoking lately?

1st thing to check is when you put in gear when cold and again when hot Take off fast ,,the noise if there igoes up and down with the speed and rpm ,,the noise you can hear mostly is the pump in side the gear box is not pushing enough pressure to the Forward Band clutch which drives the car so it has to slip and that is what you can smell the clutch bands burning And the more you can smell it the worse its getting and soon will let you down in a place you dont want to be..
So get it checked out new or as soon as poss
The A/Con clutch also sounds like its worn out.

sounds like a belt or pulley bad