A/C Not Blowing Cold Pressures

2005 LJ
A/C does not blow very cold anymore (it used to), especially on a 90 degree day. 60 degrees at the vent.
Low side pressure: 42 High side pressure: 270 Both pressures are in the range shown in the service manual.
What do I diagnose next? The service manual suggests too much oil, which is unlikely given is used to work and no service was done. Blend door which I confirmed is working.
I also get an excessive amount of condensation dripping on the ground when parked, more than I used to on a hot day.

I thought I would just evacuate the system and refill and see if that fixes it? Ideas?

I also figured if I am going to evac the system, I would replace the accumulator/dryer. Every part I find online or in the store has the low-pressure switch on the accumulator/dryer. My switch is inline on the pipe. Even the service manual shows the pressure switch on the accumulator/dryer. Any experience with this (2005 LJ)?



All the parts I find have the port for the pressure switch.

freedom_in_4low said:

Something doesn't add up. If the compressor is engaged, pressures are within range and you're seeing condensation that points to the refrigeration circuit working normally. I would be looking at the blend door, but you say it's working...are you sure?

Does the air velocity coming out of the vents seem normal? Have you pulled the blower motor to make sure the whole box isn't clogged up with leaves or something?

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Air velocity feels normal. Blower motor is clear. I ASSUME blend door is working properly because I can turn from cold to hot. But....Thinking about it I probably need to verify it is closing fully. How do I check for full closure?

JKP said:

Welcome to the 05 and 06. Lots of little differences from the previous yrs and the FSM wasn't updated.

Evac and refill will do nothing.

Excessive condensation indicates the evaporator is working pretty dang well.

Did you check the low side at idle? IIRC, you're supposed to check it at a specific RPM above idle, which will drop the pressure some.

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Those readings are after I bumped up the idle. FSM says, 1,000RPMs, but there is no way I can hold it there. More like 1,500. I did see the low-side pressure drop a bit once I bumped up the throttle.

TJ4Jim said:

Your in the low end of the range at 90+ ambient temps. I would add some additional refrigerant and bump the pressures up towards the higher end of the range.

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I will try that tonight and report back if it solved anything,