David Bidelspach Posted February 1, 2021 Share Posted February 1, 2021 We are working on a 2012 Mack GU713 Granite. The A/C Compressor does not start with the normal switch. We checked the Switch on the Dash, and it is working properly. If we provide Power to the A/C Compressor, the A/C Compressor does work, and Blows Cold. It appears we have Power to the ECU, but no Power from the ECU to the A/C Compressor. I am thinking there is a Sensor, that is telling the A/C Compressor not to turn on. Any help is greatly appreciated. Thank you. Quote Link to comment Share on other sites More sharing options...
David Bidelspach Posted February 1, 2021 Author Share Posted February 1, 2021 Perhaps, it is the High Pressure Switch, Switch - Binary or Expansion Valve. Again, any help would be greatly appreciated. Thank you. Quote Link to comment Share on other sites More sharing options...
David Bidelspach Posted February 1, 2021 Author Share Posted February 1, 2021 Then again, maybe the Freon is not at the proper level, too little or too much (Pressure). My Mechanic says the Freon is correct. I need to have him double check. Thank you. Quote Link to comment Share on other sites More sharing options...
ctonline Posted February 25, 2021 Share Posted February 25, 2021 On 2/1/2021 at 5:31 PM, David Bidelspach said: Then again, maybe the Freon is not at the proper level, too little or too much (Pressure). My Mechanic says the Freon is correct. I need to have him double check. Thank you. So the high pressure is about at 200 psi & low pressure is about at 30 psi ? Quote Link to comment Share on other sites More sharing options...
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