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2003 GMC Envoy Envoy cooling problem

Tiny
KATHYDAVIS
  • MEMBER
  • 2003 GMC ENVOY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
Car was running fine. I had my oil changed at Jiffy Lube. Car running OK with A/C running. Next day, battery died (not surprised because my daughter leaves interior light on frequently). I went to Advance Auto and they put in new battery.

As I was driving away with A/C running, the engine died and displayed message "oil pressure low". Then, "Stop Engine". Car runs fine as long as A/C is off. Once I turn on A/C, the problem occurs.

Now Service Engine Soon light is on.

OnStar ran diagnostics and said "Power train system has detected a malfunction related to the cooling system."

Local mechanic will look at it today. On phone he said it sounds like air compressor.

It is too much of a coincidence that this happened right after oil change and new battery? What do you think? Could it be something simple that went wrong when changing oil and filter, or installing new battery?
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Friday, March 12th, 2010 AT 9:55 AM

7 Replies

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok it is just coincidence in this case. But do not just replace the compressor without running a scan. I would call around to your local parts stores and see if one will do a free scan and have them scan it write down the codes and then have them clear them. Now get back to me with the codes and I will look them up and see what the truck is trying to tell us before you spend lots of money.
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Friday, March 12th, 2010 AT 10:33 AM
Tiny
KATHYDAVIS
  • MEMBER
  • 4 POSTS
Also, I forgot to mention that at the same time these problems ocurred, the CD player quit working. The radio still works fine, but the 6-CD changer (Bose system from factory) won't play or eject my CDs. Do you think this is due to the installation of the new battery? My husband checked the fuse and it is OK.
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Monday, March 15th, 2010 AT 9:44 AM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
OK on the codes did you check that? Get me codes if you can. On the sterio does it say theft lock on it anywhere? On the front of the radio or cd changer or? If so then you will need to go to the dealer and have them reactivate the radio system as the battery change caused it to go into theft lock therefore locking the system. Let me know what you find and codes please.
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Tuesday, March 16th, 2010 AT 9:18 AM
Tiny
KATHYDAVIS
  • MEMBER
  • 4 POSTS
I went to mechanic yesterday. Mechanic will run scan today because he did not have that tool yesterday. He did say it is not the compressor. He said it could be a switch or a relay. I'll get codes and let you know what else he says. He added some freeon.

CD player does not display theft lock. He said a low battery can cause problems like I am having. He said there is probably an internal problem in the CD player. He mainly does repairs on Air conditioning and heating. He is not going to try to fix the CD player.
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Tuesday, March 16th, 2010 AT 10:47 AM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok great get me the codes when you can. Now with the stereo does it say theft lock anywhere on it, not just the on the cd player.
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Wednesday, March 17th, 2010 AT 9:53 AM
Tiny
KATHYDAVIS
  • MEMBER
  • 4 POSTS
The stereo does not say theft lock on it anywhere. He gave me the code from the scan but I can't find it right now, it is in my car on a piece of paper. He said he cleared it. As I recall, it was related to engine cooling.

He ran some steps that "relearn" something that may have been wiped out by the installation of the new battery. He cleaned the carburator and it seems to run fine now.
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Friday, March 19th, 2010 AT 1:54 PM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok there is no carb, it is fuel injected so he probably cleaned the throttle body. Either way glad to hear it runs good again. Now does this car have a anti-theft system from the factory?
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Saturday, March 20th, 2010 AT 10:45 AM

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