i have a 1999 cherokee 4.0l automatic with p/s and a/c. the a/c will not blow cold while everything is new. please help i need this before summer.

 

Did you have it refilled with the correct amount of freon? Did you do the work or have a shop do it? If you did the work did you pump out all of the air out of the system with a vacuum pump? If you didn't use a vacuum pump to get the all of the air out that would be you problem and I hope you didn't damage the system. If so you may have to start replacing the parts that you just installed.

 

i had a shop discharge the system, i replaced the parts, had it re vacuumed, then i had a buddy help me charge it.(he has done a/c stuff on cars a lot and he doesn't know whats wrong either.) we added the correct amount of r-134a and still no cold air. i replaced the system because i had a bad bearing that screamed bloody murder when i turned the car on. now thats gone i just need cold air. thanks for the help

 

More infos needed whats working and whats not .

 

evrything is functional, just the air isnt cold coming out. i have a feeling the compressor isnt kicking in. the ground on the compressor is loose, could that be the problem?

 

If the ground is loose tighten it.

Does the clutch kick on? Does the electric fan kick on?

 

Are you sure that the air blending door is working when you switch to AC?

After running the A/C for a while, can you see the water dripping out from underneath?

 

I will tighten the ground, and check the other said things. after that i will update you guys and seek more help if needed. Thanks for the help guys!

 

Check that ground.
Also make sure that the plugs on the pressure switches are seated properly.
How much refridgerant did you use? my 2000 only takes 20oz...that's a very small amount.
The big question is: has the AC clutch cycled on and off?

 

The sticker on the car says 1.25 pounds. A post on the forum said 1.75 pounds and some said 1.5. So I did just over 1.25.

 

And for the AC clutch, how do I know if it engages? I'm usually by myself with this so I can't tell.

 

Start the engine, turn the A/C on and watch the compressor. If the clutch on the front of it is not cycling then its not working.

 

I'll be sure to check it after school! Thanks for the help everyone!

 

You can also jump the clutch with a paperclip inserted into the wire plug that plugs into the accumulator to get the compressor going. Then you can charge it up from there. If you tried charging the system with the compressor not running, then I don't believe that much refrigerant actually went into the system. I might be wrong on that last part but that's what happened to me.

 

When we were charging it up it didn't engage till we force jumped it like you stated. That's probably what happened. Input is appreciated thanks!