Air conditioning stopped working

Your problem could be that the vacuum lines have failed, blend doors in the heater-air-conditioning duct work are stuck or malfunctioning, fuses have blown, bad switches and or relays, etc. Even with your expertise, you should have your air conditioning repaired by an experienced mechanic

This guide will help us fix it

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Please run down this guide and report back.

The AC on my 1999 Honda Civic 1.6 SOHC was not working well. I recharged the system it mostly works. It doesn't work well when I am at idle at a stop light or parked. I have the impression that the engine compartment needs to be cool enough for the AC to work properly. I thought the radiator fan wasn't coming on frequently enough so I ran a temporary toggle switch to keep the radiator fan on and it allows the AC to keep blowing cold air while stopped. However, in trouble shooting the radiator fan, I believe it is working correctly. I used a IR thermometer to check the temperature of the thermostat housing and the radiator fan kicks on when it reads 193 degrees (book says it should come on at 196). It only stays on for a minute but as soon as it goes off, the thermostat housing temperature is 180 degrees. Seems ok to me. I put a gauge set on and here is what I found:
Engine off- Low side spikes high and High side reads 100
Engine cold with AC off- Low side spikes high and High side reads 100 (no change from engine being off)
Turn AC on before engine gets up to temperature and the guages read 20 on the Low side and 140 on the high side
Once the engine gets up to temperature the Low side reads about 50 and the High side stays at 140.
As soon as I shut off the AC, the Low side goes up to 60 and slowly but steadily rises and the High side drops to 100 but eventually comes back to 140.
The book I have says that normal operating pressures are Low Side 23-36 and High side 240 to 300.
I have to admit that I'm a bit confused by the book I have as there may be more than one cause to my problem ranging from a "slightly low charge" to an Expansion Valve problem. Per the book, with a high reading on the Low Side and a low reading on the High Side, I should have a "noisy compressor" but the compressor is working fine. Any insight? PS- I haven't dug into the evaporator area but I don't see any leaks (I used a dye when I recharged last month). I have considered an after market fan control switch which will turn on the radiator fan whenever the AC is turned on but I'm not sure what the consequences are of running the coolant to cold. (If that is even a concern). I hope I have given enough information for you to help.

Also, yes- the condenser fan comes on when the AC is turned on- replaced that motor a couple of weeks ago.

Thinking of more information (sorry)- when I changed out the condenser fan motor a couple of weeks ago I cleaned the fins with a brush, AC coil cleaner, water and compressed air.

Thankyou. I put some dye in last month and I think I found a leak coming off the compressor by the rotor or pressure plate. The dye was red and I think I see a streak on the splash guard- red dye on black plastic is not easy to see so I'm going to get some UV dye and see if I can confirm. However, I still have the fan problem. All the relays work as they should. I'm thinking I have a problem with the ECM. What do you think?

A couple weeks a go while I was driving my car. I realized that I was not gettting the acceleration I was use to. Knowing that the AC can affect this I turned it off and immediately felt an acceleration kick. I turned the AC back on and noticed that there was a grinding noise and decided to just leave it off. When I got home I turned the AC on and lifted the hood. The noise was horrible and extremely loud, I thought my car was going to die.

The Honda dealer ship says it's my AC compressor falling apart and throwing aluminum pieces into my AC system. I would like to know if it is my AC compressor or my AC clutch and do I really need to replace the AC hoses.

Thank you in advance for your help.

Yes. Both fan motors work- Condenser works when AC comes on and radiator fan comes on when the circut is closed on the ECT. (Both work with a hot jump too) I also jumped the power circuits in the relay slot and the radiator fan came on. When I jumped the power circuit on the condenser fan, I just heard a click coming from somewhere around the compressor. Not sure if the other electronics, such as AC clutch relay have anything to do with it but when I put the condenser fan relay back in and turned on the AC, the fan came on as expected. Just can't get them to come on at the same time (when turning on AC) unless the coolant temp gets high enough to trigger the radiator fan.

Alright, pulled the ECT, pulled connector A and grounded the port for A20 on the wiring harness/connector. The radiator fan came on! I checked for a ground on the PCM/ECM A20 terminal and got nothing. I ran a jumper from PCM terminal A20 to the port on the connector and got nothing. I'm not sure how the PCM/ECM is grounded. I connected a temporary ground to the slot where the bolt holds the unit to the car and reconnected Connector A and got nothing. My assumption is that no ground is being sent to terminal A20 on the PCM.

A/C not blowing cold air. I had the system gassed up last summer an the pressure was good and had it checked for any leaks and there was none. The compressor was working and it was blowing somewhat cool air but not cold. Then I think it may have stopped turning on but im not really certain. Its like I can here it when it turns on but not 100% positive because its not as loud as it was.

I thought the conversation was going there. Thanks for your help.

99 civic I have replaced the coolant reservior recently because it had a hole in it. I also replaced the radiator and thermostat because the temp will get real high and then the A/C will blow hot air, I will check the fluid after it cools down and it will be half gone. I bought the car about a year ago and it has just started doing this. Any ideas?

The fluid is constant in the coolant reservoir. When I replaced the radiator I did not have the system flushed. I just let what coolant that was in there come out and put on the new one and poured more fluid in.