2000 Grand Prix GT A\C Problem

Tiny
NICK.GUARINO
  • MEMBER
  • 2000 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 280,000 MILES
I havea 2000 Pontiac Grand prix GT. I'm having problems with two things with my a/c, first thing is that there is a digital display and it reads a number with the letters EXT next to it, I would like to better understand this number because when it reads 37 or less my a/c stops blowing cold air, and when I drive the car the number quickly falls to the number 37. Please help me better understand, and help solve the issue with my a/c. Thank you in advance.
Do you
have the same problem?
Yes
No
Monday, July 4th, 2011 AT 11:53 PM

3 Replies

Tiny
RASMATAZ
  • MEMBER
Rt this:

SELF-DIAGNOSTICS
NOTE:Diagnostic Trouble Codes (DTCs) should be diagnosed and repaired before proceeding with any other tests. DTCs can be retrieved using A/C-heater control unit. If no DTCs are set, diagnose problem by symptom, see appropriate test under TROUBLE SHOOTING.

RETRIEVING DIAGNOSTIC TROUBLE CODES
If a fault has occurred in a monitored circuit, the MAN symbol on right side of A/C-heater control unit display will flash during first 2 minutes of operation. To enter diagnostic mode, turn ignition on, then press both temperature ****s simultaneously for 5 seconds.
There are 2 display modes within self-diagnostics: diagnostic pointer and diagnostic value. By rotating driver's temperature ****, one detent in either direction, display is toggled between pointer and value.
Value displayed is decimal equivalent of Random Access Memory (RAM) contents. A "2" is formed using minus sign, and leading "1" in order to display values over 199. Diagnostic pointer mode is identified by a minus sign preceding pointer number. Pointer provides an index, identifying corresponding diagnostic value.
DTCs reside under diagnostic pointer 00. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION table. Pointer will be set to this position upon initial entry into self-diagnostics. If more than one DTC is present, they will be displayed sequentially at a rate of 2-second intervals per fault. Rotating passenger temperature **** will switch self-diagnostic pointers.
A wraparound feature is provided if pointer is continued past either end. Other data used by computer resides under different self-diagnostic pointers and may not be useful in diagnosing A/C-heater system. To exit diagnostics, press any mode button.
NOTE:A 2-digit DTC indicates fault is current. A 3-digit DTC indicates fault is intermittent.

DIAGNOSTIC TROUBLE CODE IDENTIFICATION
DTCFault
00No Faults Found
01 Or 101In-Vehicle Air Temperature Sensor Shorted To Ground
02 Or 102In-Vehicle Air Temperature Sensor Circuit Open
03 Or 103Outside Air Temperature Sensor Shorted To Ground
04 Or 104Outside Air Temperature Sensor Circuit Open
DTC 05 Or 105Left-Side Temperature Valve Actuator Shorted Or Open
DTC 06 Or 106Right-Side Temperature Valve Actuator Shorted Or Open
07 Or 107Serial Data (Class II) Line Open
08 Or 108Sun Load Temperature Sensor Circuit Open
01, 03 & 08; 02 & 04Multiple Codes Displayed

CLEARING DIAGNOSTIC TROUBLE CODES
After a repair is completed, DTCs must be cleared from memory to ensure proper system operation. To clear memory, press A/C mode button.
Was this
answer
helpful?
Yes
No
Tuesday, July 5th, 2011 AT 4:42 AM
Tiny
NICK.GUARINO
  • MEMBER
I'm sorry that's not my question, I didn't mention anything about doing a diagnostic test, I just wanted information to help me better understand my situation. I wanted to know what that number I mention ment and why it changes so ferociously. Sorry to be rude but my question had nothing to do with DTC's.
Was this
answer
helpful?
Yes
No
Tuesday, July 5th, 2011 AT 5:26 AM
Tiny
RASMATAZ
  • MEMBER
You're coming up with numbers/letters that pertains to the AC. I figure it will help-since it didn't do you good- I'm sorry too! This is my last post- Good Luck
Was this
answer
helpful?
Yes
No
Wednesday, July 6th, 2011 AT 12:06 AM

Please login or register to post a reply.

Recommended Guides