Year: 2001
Make: Chevrolet
Model: Suburban
Engine Size: 5.3
Refrigerant Type: R134
Ambient Temp: 80
Pressure Low: 75
Pressure High: 75
Country of Origin: United States
My Suburban has climate control and dual air. The AC compressor was "liquid slugging." I have replaced the compressor, dryer, and O-tube.
I pulled a vacuum that held and have charged with 3 lb. of R134. This is my first AC job. I disconnected the battery while replacing the components. After reconnecting the battery, I can not get the AC compressor to engage. I have read the climate control has to be reset, but can not find out how to do this. what is the procedure fore getting the compressor to engage.
Any help would be greatly appreciated.
direct from alldata
Without A Scan Tool
Turn OFF the ignition.
Remove the battery positive voltage circuit fuse of the HVAC Control Module. IMPORTANT: The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds .
Wait 60 seconds .
Install the fuse.
With A Scan Tool
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, select Heating and Air Conditioning.
Select Special Functions.
Select Setup New HVAC.
Follow scan tool prompts
Thanks for the information.
However, that brings more questions. If the scan tool is the only way reset the AC.
Where can you purchase one, how much do they cost? Is it better to take it to a shop? I feel like I am close to getting it back running, but my time frame is running out.
Thanks again for the help.
Sorry, did not see read correctly about not having a scan tool. However, I would like to have the other information.
Hopefully one last question. Should resetting the HVAC control get the compressor to kick in?
Sorry, for the multiple post. I am new to posting and AC repair.
Thanks for helping the novice.
Yes you should measure if the compressor is receiving voltage (after checking that it is plugged in). The new compressor clutch could be bad (how does the gap look?). I think that disconnecting the battery is the same effect as removing the fuse, so it should have started for you right away.
Cussboy,
Do not worry about offending me. If you are willing to help, you can say anything you want to me.
The compressor I purchased was new with clutch. So the connector on the compressor side is new. The connector on the truck side is still the same.
I have not jumped a wire to the compressor. I was planning on trying that this afternoon. Is there a way to determine which is the positive and negative side of the clutch coil. If I run both hot and ground is the clutch polarity sensitive.
I have not checked the ohms on the compressor. Do you know how many ohms there should be?
The high and low side pressures are reading between 75 and 80 which I believe should let the compressor run.
Thanks again for the help.
Should the clutch be engaged with the key on and the engine not running if the AC is turned on. Or will I need the engine running to check this.
I design electrical systems of large fork lifts for a living. However, I am completely ignorant of how the ac controls on my vehicle work.
Is there any kind of sequence you have to do after the computer has been reset.
Am I going to need a scan tool like the first response mentioned.
Thanks again for the help.
The engine will need to be running. The PCM disables the clutch until the engine is running.
B.
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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.
Thanks for the information. I am planning on trying these things when I get home.
If these suggestions do not get my problem solved, I think I am going to pay for the information off of alldata.com
Thanks again.
Sorry still trying to get the hang of posting.
I hate to even admit what I found to be the problem but I figured you all deserved to know.
While tired last night, I overlooked a fuse that was controlling the ac compressor. Cooling well right now. I hope it last.
Thanks to all who responded and thanks to the forum providers for giving us novices a place to talk to people who know what they are doing.
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