Long story short the ac in my jeep hasn't worked since I got it. AC compressor blew a gasket and I finally replace the compressor. I also replaced the dryer.

I just got back from my friends shop and he hooked up this bad @ss machine and evacuated the system and recharged it (2LBS per sticker) and put oil in it.

It leak tested OK. I'm not sure what to check but it should blow way colder than it is. It currently is blowing around 62 on the freeway.

Any ideas would be great!

Thanks


<----not sure when this would be appropriate but....there it is lol

 

Fill in the blanks:
High ________
Low ________
@ ____°F

 

Do you mean the high side pressure and low side pressure? I'm not sure since my friend did it.

I can ask him.

 

High 240
Low 30
@ around 80-85°F

 

Bump

 

Pressures look OK, have you checked the blend door?

 

No I haven't. Is that the technical name for it?

I don't know where or what that is

 

Well, blend door is the technical name for it more or less.

It is inside the evaporator, which is inside the Jeep, behind the glove box area and under the dash.

As you cycle through the modes on the control panel, various doors inside the box move back and forth to block or open various passages in the box. They control how much and where the air moves.

The blend door, in A/C mode, must isolate the heater core so that air does not pass through it. If air can pass through it, the heater will win over the A/C every time.

There might be some Jeep experts on here, that know way more than me on this matter, that will see this and chime in on all the particular of the Jeep climate control system.

Under the hood, if your high side fitting on the compressor is getting too hot to touch, and the low side is getting pretty cold, freon is moving through the system. If you have a sight glass, you might see it moving. The pressures you quoted earlier sound normal.

 

OK thanks. I won't have time to look at it this weekend but I think that the blend door is the issue.

The hot side on the compressor is very hot and the cold side is very cold.

I replaced the drier and the new one doesn't have the site glass so I can't see.

I did a little research and the first thing I'm going to look at is the actuator for the doors and make sure it making a full movement when changing from hot to cold.

Is it easy to take the blend door out? I couldn't find to much info but one thing shows you have to take the dash out or cut a hole into the plastic under the dash.

It looks like it changes depending on year. Couldn't find anything for a 96. Only 99+.

Thanks again for your guys help

 

If you poke your head under the dash on the passenger side, look up past the passenger floor outlet and you'll see the door cable connection. Rotate the temp selector stop-to-stop and you should see the door linkage operate the door smoothly.

 

Is the condenser clean?

 

Additional things to check:

Check the mechanical fan clutch. With the engine cold spin the fan by hand. If the fan freewheels without drag more than five turns replace the clutch.

Does the electric fan operate? The fan should turn on when AC is requsted and whenever the AC compressor clutch is engaged. The low pressure cycling switch on top of the accumulator cycles the compressor clutch and the fan.

 

Thanks for your input.

The condenser is cleanish. I'll put the hose to it to be sure.

The fan clutch is new (3 months tops). I actually have the problem of it staying engaged to long. It roars past 3k rpms.

I have a warn bumper with 12k lbs winch. 2 core aluminum radiator and b&m trans cooler. So the air flow over the condenser is not....ideal.

The electric fan engages as it should when the ac is turned on.

Also a side not for the flapper door thing. My heat works great and it goes from hot to not so hot when moving the temp control.

 

So I checked and the cable operates smoothly. I read that the blend doors fall apart or crack quite often on all jeeps. Is there a way to visually see the blend door?
I saw a picture of how to cut the black box to replace the door. Is this the only way to see it?

 

"I read that the blend doors fall apart or crack quite often on all jeeps."

I dispute that. I have a "87 and a "92 that don't have any problem with their blend doors. I'm quite sure they are original.

We don't see posts about busted blend doors on this forum.

You are going to be real sorry if you cut up your box to try to get to the blend door.

If that truly is what's bad, I predict you're going to be pulling the dash to get to it.