HVAC Compressor Clutch Does Not Disengage. Buick LeSabre 2000

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2000 🢒 LeSabre 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 HVAC Compressor Clutch Does Not Disengage

Step	Action	Yes	No
SCHEMATIC REFERENCE: Compressor Control W/CJ2 HVAC Components HVAC Compressor Controls Circuit Description Heater AC Control W/CJ2 Handling ESD Sensitive Parts Notice Handling ESD Sensitive Parts Notice Handling ESD Sensitive Parts Notice Serial Data Class 2 Sensors Sensors G100 and G102
1	Did you perform the HVAC Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check
2	Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, command the A/C Relay ON and OFF. Does the A/C clutch engage and disengage with each command?	Go to Step 3	Go to Step 7
3	Start the engine. Turn the A/C OFF. With a scan tool, observe the Commanded A/C parameter in the PCM Engine Data 2 list. Does the scan tool display OFF?	Go to Step 12	Go to Step 4
4	With a scan tool, observe the Control Head (Desired) parameter in the DIM A/C Information list. Does the scan tool display A/C OFF?	Go to Step 5	Go to Step 6
5	With a scan tool, observe the A/C Clutch (Desired) parameter in the DIM A/C Information list. Does the scan tool display OFF?	Go to Step 12	Go to Step 11
6	With a scan tool, observe the A/C Requested parameter in the IPM HVAC System Data list. Does the scan tool display No?	Go to Step 11	Go to Step 10
7	Turn OFF the ignition. Disconnect the A/C relay. Turn ON the ignition, with the engine OFF. Does the A/C clutch disengage?	Go to Step 13	Go to Step 8
8	Disconnect the A/C compressor clutch. Does the A/C clutch disengage?	Go to Step 9	Go to Step 14
9	Repair the short to voltage in the switched output circuit of the A/C relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 18	--
10	Inspect for poor connections at the harness connector of the instrument panel module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 18	Go to Step 15
11	Inspect for poor connections at the harness connector of the dash integration module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 18	Go to Step 16
12	Inspect for poor connections at the harness connector of the powertrain control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 18	Go to Step 17
13	Replace the A/C relay. Did you complete the replacement?	Go to Step 18	--
14	Replace the A/C compressor clutch. Refer to Compressor Clutch Coil Removal (V5 - Conventional Mount) . Did you complete the replacement?	Go to Step 18	--
15	Replace the instrument panel module. Refer to Instrument Panel Module Replacement in Body Control System. Did you complete the replacement?	Go to Step 18	--
16	Replace the dash integration module. Refer to Dash Integration Module Replacement in Body Control System. Did you complete the replacement?	Go to Step 18	--
17	Replace the powertrain control module. Refer to Powertrain Control Module Replacement/Programming in Engine Controls-3.8L. Did you complete the replacement?	Go to Step 18	--
18	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2

Compressor Control W/CJ2