Accord 1999 3.0 A/C problem
 

My apologies for any redundancy as I am new to this forum.

My 1999 EX V6 AC stopped blowing cold air.
The Compressor and fan appear to function correctly.
Removed the cabin air filter and replaced. While cleaning, noticed that the incoming line or (the line which has (2) 90 degree elbow and on the bottom), while on, turns cold white. The area following the location of where the vacuum line or (the small cooper tube line) ties in is not cold.
Does this mean that the vacuum line is plugged of is this assembly faulty somehow?
There is a slight hissing sound – but I cannot locate any leaks.
Any help would be greatly appreciated.

Here is one test for troubleshooting a/c on your car:

1. Turn the key to the II position
2. Set temperature knob to max cool, then slowly to max hot.
3. after 1 minute press the auto and off button and hold them down.
4. The digital temperature reading will light up one of the segments of 88, and then flash all the segments.

See the common diy thread on top of the gen tech help forum for getting hvac codes under the 03-07 accords to see what each segment means. I need to write this up and put it in that DIY as well for the 98-02 accords.

Could be a possible clogged expansion valve.

Thank you for the quick response.

Does it matter what position the system is in when I begin your procedure? I began in Full Auto mode, followed instructions, and I didn't see any response on the display. Should I be looking elsewhere?

Thank you.

Thank you as well.

Is there a proper procedure to repair the clogged expansion valve?

If it is clogged it can be caused from debris, such as from the compressor or broken desiccant bag in the drier. It could also just be a faulty valve (i.e., not opening).

Best to let a certified A/C tech diagnose and handled it. Many times, trying to DIY may end up with more problems and costing more.

1. Evacuate the system.
2. Ssometimes require replacement of the expansion valve and/or some other parts in the A/C system.
3. Recharge system.

I'll post some more info. regarding the thermal expansion valve (aka expansion valve). This may or may not be your problem; however, in your first post, it was stated the compressor and fan appear to function correctly.

THERMAL EXPANSION VALVE
The thermal expansion valve is a mechanical valve (not electronically controlled) which regulates refrigerant flow into the evaporator by sensing the discharge temperature on the evaporator outlet. It has a diaphragm controlled valve and has a remote calibrated sensing bulb connected to this diaphram via a thermal tube. The cooler the evaporator outlet is, the more it closes, the higher the outlet temperature, the more it opens.

Can become clogged with debris; but, also may stick and malfunction due to corrosion.

Thank you for your assistance in this matter. It is greatly appreciated.