2001 c5 ac compressor nit engaging.
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Instructor
Joined: Nov 2024
Posts: 120
Likes: 4
2001 c5 ac compressor nit engaging.
Well time to move on to a another issue with the 01 c5 with 99K miles
ac compressor clutch wont engage.
evacuated the system and recharged with no clutch engaging.
with gauges on pressure is 85 and high side matches
Will not take anymore refrigerant.
Replaces pressure sensor
replaced relay 34
34.fuse is good
Relay 30 and 87 jumped no clutch but fans kick on
Pin 85 at the relay- connected to dmm then the other lead to the negative battery terminal = 0.026V should pin 85 be zero?
Just fixed it back ground behind passenger headlight
ac compressor clutch wont engage.
evacuated the system and recharged with no clutch engaging.
with gauges on pressure is 85 and high side matches
Will not take anymore refrigerant.
Replaces pressure sensor
replaced relay 34
34.fuse is good
Relay 30 and 87 jumped no clutch but fans kick on
Pin 85 at the relay- connected to dmm then the other lead to the negative battery terminal = 0.026V should pin 85 be zero?
Just fixed it back ground behind passenger headlight
Last edited by Woopigsooie00; Jul 15, 2025 at 07:38 PM.
Pro
Joined: Dec 2014
Posts: 682
Likes: 275
From: Cincinnati Ohio
Have you verified the mechanical condition of the compressor clutch, pulley, and coil connector? A few months ago, a Forum member described an issue where his compressor clutch would not engage. He had about 1/2” gap between the clutch and pulley.
