Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
sorry for the delay.............Greetings...... “Hi, I’m Don (aka MOLurch) and I look forward to helping you!”.
This is typically caused from a bad compressor clutch relay, bad connections to it or bad PCMIgnition voltage is supplied directly to the A/C compressor clutch relay. The powertrain control module (PCM) controls the relay by grounding the control circuit through an internal solid state device called a driver. The primary function of the driver is to supply the ground for the component being controlled. Each driver has a fault line, which is monitored by the PCM. When the PCM is commanding a component ON, the voltage of the control circuit should be near 0 volts . When the PCM is commanding the control circuit to a component OFF, the voltage potential of the circuit should be near battery voltage.The Relay is located in the Under Hood Fuse / Relay BoxI can post the Testing Procedures if you want, but you will need use of GM Scan Tool or Equal.IF you need more information, please ask "prior" to Rating..Please do the right thing and leave a rating, using the rating system, so I may be credited for this Q&A..NOTE: Do NOT Rate on how much TIME you waited, because I am not on 24 / 7 and I answer as soon as I see the question.The question will still remain open for follow up questions if needed..If for any reason, you can't rate my answer OKAY, GOOD, or EXCELLENT today.Please reply and let me know why, so I can help more/better..Rating is very Important to our Service.
I have a scan tool. Like the one on the link. Will it work? It does read 3 different ac things.
according to specs, this will not......But you can try a reset of the Trouble Codes & see if that clears the issue.
I have tried that. And also disconnecting the battery.
as stated, "typically caused from a bad compressor clutch relay, bad connections to it or bad PCM"Replace the Relay, clear the codes & tryOtherwise, you will need to Test via correct type Scan Tool
My scanner shows ac relay circuit short to ground. I know the relay is good cause I swapped it with another relay. I would like to test the pin holes for the realy...can u tell me if im supposed to have power or ground to each pin hole.
Here is GM Test procedures:click attachment below
The numbers below refer to the step numbers on the diagnostic table.
3.Listen for an audible click when the A/C compressor clutch relay operates. Command both the ON and OFF states. Repeat the commands, as necessary.4.This step tests for voltage at the coil side of the A/C compressor clutch relay. The 10-amp fuse supplies power to the coil side of the A/C compressor clutch relay.5.This step verifies that the PCM is providing ground to the A/C compressor clutch relay.6.This step tests if ground is constantly being applied to the A/C compressor clutch relay.7.This step tests for a short to voltage or an open.13.Perform the programming procedure for the PCM.
Please do the right thing and leave a rating, using the rating system, so I may be credited for this Q&A..NOTE: Do NOT Rate on how much TIME you waited, because I am not on 24 / 7 and I answer as soon as I see the question.The question will still remain open for follow up questions if needed..If for any reason, you can't rate my answer OKAY, GOOD, or EXCELLENT today.Please reply and let me know why, so I can help more/better..Rating is very Important to our Service.
.Hello again Lurch here.
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