Ty.

Up until the other day, i had no problems with my A/C in my 02 Z06. A few days ago i turned the front defrost on, and noticed the a/c light didnt stay on, so i tried to turn the actual A/C on, and got nothing...

When you attempt to turn it on, the a/c light will flash a couple times, then just go out. I checked the low side of the a/c system, and its reading roughly 90psi (a little in the red on my gauge).

Any advice?

byronhunter

Yep, first check for codes!

Ty.

I checked codes before i posted this thread. There were no stored HVAC codes...

pewter99

low freon is my guess.

ipuig

90 PSI on the suction side? It does not sound like the compressor was operating when you checked the refrigerant pressure. What was the discharge side pressure?

derty01

Did you have the car running with the A/C on and fans on max? That is how to check the low pressure side of the air condition. Just recharged mine today first time ever in 4 years and she is a 98. Add some freon and fixed the problem.

johnson-rod

What was the outside temp? It may have decided that you don't need A/C.
Mine has a mind of it's own. I stopped trying to second guess it.

scott1974

A friend of mine is having this same problem. The compressor does not kick on. The light on the button just flashes about 5 or 6 times and goes out. No A/C...No HVAC Codes. Any Input?

dougbfresh

Bring it into a garage with some heat and see what happens. AC trying to kick on when it's too cold will freeze up the system.

n8dogg

Sounds like the charge has leaked out. Charge the system and inject dye. Run the A/C and inspect for the leak. The A/C compressors are common leak points in these cars. About a 4 hour job, water pump needs to be removed for access. Auto Zone has rebuilt OEM compressors for a couple hundred bucks.

rebelheart

Ambient temp may be to low for the a/c system to operate.

freeman4ever

This happens to me on occasion as well. I do not have problems with low ambient temperatures where I'm from.

When the light does [decide to] stay on, the AC works as it should.

Vettmann17

Same thing was happening on my 02 also. I had the system recharged last summer and it's been fine ever since.

schnellTTZ06

I cant remember what the exact temperature is but it's true, the AC will not turn on when it's too cold out.

MR496

I am having the same problems, the AC light comes on and goes out. i have checked the fan relays and the connection at the compressor. I do get a trouble code of 1546. could it maybe be the pressure switch located on the passenger side just under the coolant tank? How do I bypass this 3 wire switch to see if the compressor kicks on? it has a red wire, gray wire and black wire. Dont want to jump across the wrong wires. Any suggestions?

Mike

lucky131969

Not sure why you want to jumper the pressure switch, or mess with the fan relays. The code is telling you what to troubleshoot.

The PCM monitors the voltage, when the A/C clutch relay is closed(#34), if the PCM does not detect 12 volts, after it has commanded relay #34 "on".......you get a code P1546.

Have you checked fuse 24 in the underhood fusebox?

MR496

the relay covers were loose so I replaced them. My son was in the car and once I wiggled the relay he pushed the AC button and the compressor engaged. Finally after finding out that wasn't the problem (Coincidence) I replaced the pressure switch and it seems to be working now. That is y I wanted to bypas the switch to see if that solved the problem. I didnt know if this could be done with the PCM controlling the AC that is y I asked. Fingers crossed It is working for now, guesss we will see. I had replaced the compressor last october because the old one crapped metal all over the system and I did an extensive flush and replaced the orifice filter and I am now thinking the switch was contaminated and caused it to be erratic and finally go bad.

lucky131969

Good luck with that. If the pressure sensor is bad, the PCM will not even command on the relay, and you would get a code P0530.

Georgies

Same problem here. I just had the car apart for a month for a cam swap and headders.. last night i started her up for the first time, and the AC button get pushed, the light stays on for 2-5 seconds and the light goes out...

Any coincidence with this problem and doing a cam swap?

3sACROWD

Try pulling your codes. Any chance you unplugged the outside air sensor. Is your HVAC displaying and accurate temp? If not, that could be your issue.