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A/C ECU Module

03ChevyAvalanche

New Member
Joined
Apr 3, 2016
Messages
3
I have a 2003 Chevy Avalanche 1500 and the ac stopped working. The compressor is not engaging. The snowflake light does come on but only hot air comes out. When i hooked up a code reader to it it said that it was not getting a response from the A/C ECU. Does anyone know where the A/C ECU is located? Thanks in advance.
 
I think your hvac is like my 03 it works oppisite

Read this post

http://www.chevyavalanchefanclub.com/cafcna/index.php/topic,146461.0.html

Click on the picture in the 12th post for the video
 
Sure you have system properly charged?

Or the Low pressure switch is still good?
 
The pressure is at 100 on both the high and low sides. The blower motor is not grounded which leads me to believe that the compressor is not grounded either. When you run a ground wire to the frame behind the glove box the blower motor turns on no problem.
 
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