Assuming it has dual climate control. Sounds like you might have a blend door problem on the d/s, bringing the rpm's up simply makes the a/c blow colder overcoming the temp door difference.
This will help reset the system
The DTC's can be cleared in two methods, Scan Tool method or On-Board diagnostic method.
Clearing (DTC)s On-Board Diagnostic Method
1. Press OFF and WARMER (digital IPC) or OFF and PASSENGER WARMER (analog IPC).
2. Press LO (fan speed) button until Air Conditioning Programmer (ACM)? Appears.
3. Press HI (fan speed) ACM CODES? Appears.
4. Press LO (fan speed), ACM CLEAR CODES? Appears.
5. Press HI (fan speed) to clear codes. ACM CODES CLEAR appears.
Please run down this guide and report back.
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Tuesday, July 3rd, 2007 AT 7:58 AM