Ac not working

[Scott Gaither]

Ac clutch will not engage I have replaced the low pressure switch and high pressure switch and the dual climate control panel with the digital readout along with fuses and relay and still not getting power to the low pressure switch or compressor Freon is fine took it to a shop and pulled system down and a vacuum and recharged system wandering what the problem could be

[Formulabruce]

Scott, Welcome to GM-Trucks !

 Lets look at one big thing.Quote > " Freon is fine took it to a shop and pulled system down and a vacuum and recharged system wandering what the problem could be ." < End Quote

 A  shop can evacuate the system ( Suck it down) Test the vacuum to see if it holds. The Compressor MUST be working  Though to Re Charge the system.. If the compressor is NOT turning, the system is NOT drawing a vacuum at the low side for the entry of new freon ( 134) and New freon will NOT go in , in gas or liquid form.

 Check the AC ONLY serpentine Drive belt and the IDLER pulley on that same  belt. It is known to go. Idler is way down "under"

 get your hand on that compressor when truck is OFF and see if you can spin it, and check  the drive belt and Idler.

 Good luck

[silveradosid]

if you pull the system down to total vacuum you can liquid charge the system without the compressor running i do this all the time it is much faster

[Supreme Pizza]

1 hour ago, Scott Gaither said:

Ac clutch will not engage I have replaced the low pressure switch and high pressure switch and the dual climate control panel with the digital readout along with fuses and relay and still not getting power to the low pressure switch or compressor Freon is fine took it to a shop and pulled system down and a vacuum and recharged system wandering what the problem could be

 

 

   1) Stop guessing. Don't throw any more parts or money at it. 

 

   For example: You could have a bad pump clutch gap. That is easy and free to fix in about 10 minutes. NEVER guess. Never throw parts at something as a process of elimination. 

 

 

 

[Formulabruce]

8 minutes ago, silveradosid said:

if you pull the system down to total vacuum you can liquid charge the system without the compressor running i do this all the time it is much faster

 Upside down can and gravity, ok I would buy that!

[O_J_Simpson]

Find a new shop.

[silveradosid]

is your engine fan running all the time, had this problem on a 2015 sierra the wires going into the pressure switch at the compressor were corroded

[mudracer45a]

Had that happen on my grand Cherokee bout a Month ago.

 
 
   1) Stop guessing. Don't throw any more parts or money at it. 
 
   For example: You could have a bad pump clutch gap. That is easy and free to fix in about 10 minutes. NEVER guess. Never throw parts at something as a process of elimination. 
 
 
 

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