I have a '99 Jeep Cherokee Sport, and I just charged my a/c system because it wasn't work too well.

To make a long story short... I put the gauge on the system and it read in the green zone about 15 psi so I charged it with refrigerant to midway into the blue zone (35 psi).

And yes I used R-134a regrigerant

Now I have a loud growl comming from (I think) the a/c pump.

Any comments on what it could be, and what I can do to fix it are welcome.

 

Could be jist a cowinkidink, but it may be my transmission.

Now that I think on the sound and now vibrations, it may be the tranny.

This could be bad... I need help with diagnosing both...

 

was ther oil in the refrigerent???? If you baught the cheap stuf without oil that coulbe be the problem. Does the sound go away when the AC is OFF. or is it only when driving.

 

Yup... Oil...

Now for the explaination...

I noticed the sound when I had it idling, but new big developement. Now it makes the noise and shakes when I start the jeep. Also makes the sound in reverse.

 

Is it only when you have the A\C on? if not, you could be looking at transmission, t case, and or driveshaft noise.

 

Nope...

Now makes the sound only when the jeep is in gear and moving slow (i.e. Below 30 [no throttle]), in R,N,&D. And on startup and shutdown.