Service A/C light

Tiny
CMFC_77
  • MEMBER
  • 1993 BUICK RIVIERA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
The service a/c light is on in my wife’s car, 1993 Buick Riviera. I check all the fuses only found the cigarette one bad, changed it, did not fix the a/c I checked the power at the compressor and I do not have any power. I put a set of gages on it without the car running both sides showed about 75-80 pounds, any help would be Appreciated

thanks
calvin
Do you
have the same problem?
Yes
No
Thursday, April 7th, 2011 AT 4:33 PM

9 Replies

Tiny
WRENCHTECH
  • EXPERT
The control module has shut the system down because it has recognized a problem, usually fast cycling that is sometimes cause by low refrigerant. You can reset the module temporarily by disconnecting the battery for testing purposes but don't try to continue to use it that way. It shut itself down to prevent damage.
Was this
answer
helpful?
Yes
No
Thursday, April 7th, 2011 AT 5:15 PM
Tiny
CMFC_77
  • MEMBER
Thank you I will try that tonight, what should the pressure be when it is running?
Was this
answer
helpful?
Yes
No
+1
Thursday, April 7th, 2011 AT 5:41 PM
Tiny
WRENCHTECH
  • EXPERT
There are many, many variables involving the pressures. You really need to understand how A/C works to recognize what's correct and what isn't. With outside temp over 70degrees and on high blower, you should be seeing something between 30 and 40 on the low side and 175 to 250 on the high side but that's not a rule by any means. The best thing to do is have it completely evacuated and recharged with the exact charge it should have. That is the ONLY way to ever know if it has the right charge in it or not.
Was this
answer
helpful?
Yes
No
Thursday, April 7th, 2011 AT 5:48 PM
Tiny
CMFC_77
  • MEMBER
Thank you for the info
Was this
answer
helpful?
Yes
No
Thursday, April 7th, 2011 AT 6:06 PM
Tiny
CMFC_77
  • MEMBER
By disconnecting the battery it reset the system. I thought by fixing the vacuum hoses that were leaking would fix the problem but it has not. The car is running better but still having problems with the service a/c light coming one.
Was this
answer
helpful?
Yes
No
Wednesday, May 4th, 2011 AT 1:25 PM
Tiny
WRENCHTECH
  • EXPERT
And what did the shop determine when you brought it to them to have the codes scanned and the system diagnosed?
Was this
answer
helpful?
Yes
No
Wednesday, May 4th, 2011 AT 1:29 PM
Tiny
CMFC_77
  • MEMBER
Have not had the money to take it to a shop yet.
Was this
answer
helpful?
Yes
No
Wednesday, May 4th, 2011 AT 3:22 PM
Tiny
WRENCHTECH
  • EXPERT
That is your next step so let us know when you do.
Was this
answer
helpful?
Yes
No
Wednesday, May 4th, 2011 AT 3:30 PM
Tiny
CMFC_77
  • MEMBER
Will do thanks for the help.
Was this
answer
helpful?
Yes
No
Wednesday, May 4th, 2011 AT 6:24 PM

Please login or register to post a reply.

Recommended Guides