Need help with A.C. problem

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Apr 12, 2003 | 03:38 PM

az28

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Joined: Feb 2003

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From: Boynton Beach Fl

Need help with A.C. problem

I have a '93 convt. I am experiencing intermittent problems withe the AC system. Somtimes the fan won't blow, then comes back on after closing a door or the hood. Right now, the fan is blowing , but the compressor isn;t kicking in. I don't think it's low on coolant charge, because when it does
come on its ice cold. The fuses all look good, and I have replaced the relay for the blower fan. Any ideas? Thanks
JR :confused:

Apr 12, 2003 | 03:56 PM

sumoboy

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Joined: Feb 2003

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From: Joppa Md

Re: Need help with A.C. problem (az28)

Does it only have the fan problem with the A/C only?
I don't understand the hood and door thing but that something is loose.

Apr 12, 2003 | 05:29 PM

C4TOMCAT

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From: COCOA Florida

Re: Need help with A.C. problem (az28)

1 is it manual or electronic control
2 do you have any codes set in the a/c controls....blinking lites above the controls.
3 the pressure switch on the large line next to the firewall on the psngrs side is the safety switch for low charge. it will keep the compressor clutch off to prevent compressor damage. try jumpering it out...if the compressor runs then you are low on charge....don't keep it jumpered too long. OR it could be a bad switch OR it could be bad electrical at that connection. post results or e-mail me if you need more help.

Apr 12, 2003 | 05:46 PM

az28

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From: Boynton Beach Fl

Re: Need help with A.C. problem (C4TOMCAT)

It is elect. control. There were lights flashing above the control buttons just after the problem started. They stopped flashing after a minute or two. I am a "newbie" to C4's, whats the light about? Thanks!
Jay :flag

Apr 12, 2003 | 08:38 PM

C4TOMCAT

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From: COCOA Florida

Re: Need help with A.C. problem (az28)

The lights indicate a fault was diagnosed by the controller and it set a code in memory. I will e-mail you instructions on how to retrive the codes. the code numbers point you in the direction of troubleshooting the fault.

Apr 12, 2003 | 08:41 PM

don hall

Safety Car

Joined: Aug 2002

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From: SANTA CRUZ CA

Re: Need help with A.C. problem (az28)

Citing from the '93 GM manual:
To enter the diagnostic mode, push and hold the fan "up" arrow and fan "down" arrow at the same time for approx. 5 seconds.

The LCD WILL SHOW "00". PUSH "AUTO FAN", and the LCD will show any fault codes stored.

Post the codes displayed, and we will provide the code description............

I will email you code descriptions, if necessary.

Apr 12, 2003 | 08:43 PM

Wildride

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Joined: Sep 1999

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Re: Need help with A.C. problem (az28)

Run the "Built In" diagnostics. They may give a clue as to what is wrong.

Try this web site for instructions on how to do the diagnostics and what the various codes mean:

http://www.idavette.net/tech/c4diag.htm

Apr 13, 2003 | 12:10 PM

az28

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From: Boynton Beach Fl

Re: Need help with A.C. problem (Wildride)

THANKS to you guys that helped. I ran the diagnostic codes, and got
09. I disconected the batt. to clear the codes and the AC is working again. I'll get it charged Monday. Again, Thanks for the help! This is a great forum!
JR :hurray: :flag