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John, ASE Certified Technician
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97 ElDorado: says low freon a/c compressor..low and no leaks..relay

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97 ElDorado says "low freon a/c compressor off" it is not low and no leaks. This car is immaculate. All fuses and relay are checked good Low psi switch coosed to create circut check ok what would be next step? Must be a common problem, i see a lot of posts for the same issue.



The low pressure sensor must read correctly to the PCM for it to turn on the compressor.


Code must be cleared from PCM & BCM for system to work.

Customer: replied 6 years ago.
ok i am a heavy duty mechanic not much on caddis. So with that being said, can I do that myself? How do I clear codes and should I replace low psi sensor?

Yes,replace the low pressure sensor & clear the codes.

Use the CRT climate control ON BOARD SYSTEM

Enter diagnostics by simultaneously pressing "OFF" & "WARMER" buttons.


Follow on screen displays to advance to ECM & BCM


When asked to "CLEAR CODES ?" YES

Edited by john on 2/21/2010 at 1:06 AM EST
Customer: replied 6 years ago.
I assume you are talkin about the button with "passenger and up arrow". Anyway shows ACM shows B1347 current. What clears codes when it says PCM? ? Thanks
Keep going through the prompts & it will ask you if you want to clear codes. YES
Customer: replied 6 years ago.
Thanks OK all codes cleared except ACM B1347 current. Any advice?
Customer: replied 6 years ago.
maybe it's late I see you are in a different time zone. I will wait for your nex reply. Tell you what, Peterbilt is much more in my line of duty......

This is a low freon code.When the prompts ask you BCM -- enter yes

Go to the point where it ask you to clear codes -- enter yes

The system should clear this code.


All this can be done also with a scan tool connected to the data link connector below dash on drivers side.

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