My a/c was working, sometimes it would intermittently blow some warm air a few minutes. I added some freon on Saturday and it was blowing cold. This morning my compressor will not kick in and the air is not getting cold. I did a diagnostic check on my 04 LS430 and I get the blinking code 00 28 00 28. I have tried to locate the dtc code 28 and I can't seem to locate it.

Thanks in advance for your assistance in the community.

 

Dirty system, wrong amount of refrigerant, wrong pressure, near-death compressor. Any of these.
Code 28 just means one of the solar sensors is indicating 'dark' (rear one).

 

The freon level its not in the danger zone. What should I check next? Dirty system, is that the cabin filter?




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No, dirty system. As in dirty condenser, dirty expansion orifice etc.
What's 'danger zone'? Didi you charge by weight? Or by pressure in high-side? Or just 'by ear'?
System have failsafes, it won't engage if pressure is too low and if it's too high.

 

I checked by weight. The compressor is engaging and I am cold. I checked the codes again, now the 21, 24 and 28 codes pop up. Are the condenser or expansion DIY jobs? I see that 21 and 24 are related to a solar sensor circuit. I have to do some research on that one.

 

Duh, I guess, taking the vehicle out of the garage would help the sensor sense the sun. I guess I just have to find a way to clean the system.

 

There's kits on ebay, that contain bag and filter for your a/c condenser. Well, it's rather diy if you can take condener out of the car yourself (to replace the bag+filter you need to get to it from bottom of condenser).
As to cleaning the system i think you need good reputable a/c shop with proper equipment.
I went thru all this myself. Only good a/c service man solved my problems.

 

After 2 years of trying to diagnose my intermittent non-cooling AC problem it was finally diagnosed correctly as a compressor that was locking up. Got a new Denso compressor on eBay for $325 and had it replaced along with the accumulator, been working perfectly since.