Hello! I own a Lexus GS300 3rd Gen.

The A/C light is blinking and aircond is not cold!

I tried swapping all the working relays with the a/c pump clutch relay and still it is flashing.

Any advise ?

 

I would have thought the relays as well, maybe A/C is out needs more fre-on our what ever that stuff is. My guess not sure Im right though.

 

From another website with respect to an '02 ES300...

The light is blinking because the AC system has detected a difference
between the engine speed and the AC compressor speed. As a safeguard, the
system de-energizes the AC compressor to prevent damage to the system.
Differences between the AC compressor speed and engine speed can happen if
the AC compressor drive belt is slipping, or if there is something wrong
internally with the compressor. The belt can slip if it has been in service
for a long time, like over 60,000 miles, or when driving through a deep
puddle.

Turning the AC compressor off and back on should re-cycle the system. If it
does not, then the problem still exists; the belt is still slipping, there
is a problem with the AC compressor speed sensor, there is a problem with
the compressor, or there is a problem with the AC amplifier.

 

There are several posts and a few good ideas. Here's another one.

Well, here's the latest on my blinking AC light:

I tried pressing the windshield DEFROST button (which also starts the AC) -
and that made the AC light come on steady, and AC worked !

Then I shut off the Defrost, and tried the AC button again - It worked this
time.

I couldn't figure out how pressing the Defrost button (rather than the AC
button) made it work.

Now, after reading Steve's post, I remembered that I had lightly tapped on
each relay with the screwdriver handle before trying the Defrost button.
Tapping on the relay (I don't know which one is for the AC), might have done
it, so hopefully, I won't have to spend the bucks - for now anyhow.

 

@update

checked freon pressure it is ok no leaking in piping and connections!
Tried all relays and all are working

Mine had run for 23,000km and have no defrost button!

Any advise ?

 

Check belt for slippage.

 

I suggest take it to a proper car aircon service outfit. It might need regassing anyway - it doesn't last forever. Often the cheap re-gas people don't add the right amount of lubricant, so you end up with expensive compressor damage.
Worth getting an expert on it when it starts to play up, maybe a cheap fix now to save a big job later.

 

Sounds like your compressor is not coming on. I'm willing to bet it's your expansion valve.