Quote:
Originally Posted by chris308
it's a 99
those are the only codes that popped up...
yea i have a tps going out  |
This is the only service bulletin I can find on your car as far as the AC not responding!!
Document ID# 1299761
1999 Chevrolet/Geo Corvette
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HVAC Controls Intermittently Inoperative or Improperly Responding (Reset HVAC Controller) #03-01-39-004 - (Apr 14, 2003)
HVAC Controls Intermittently Inoperative or Improperly Responding (Reset HVAC Controller)
1997-2003 Chevrolet Corvette
Condition
Some customers may comment that the HVAC controller may have become intermittently inoperative or erratic in operation. In most all cases, the HVAC controller will function normally when the vehicle is examined by the technician. Additional comments may include a variance in the air temperature from driver to passenger side air vents.
Cause
The customer may be turning the temperature knob from warm to cool or from cool to warm very rapidly. Under certain conditions, if the temperature knob is rotated very quickly, it may exceed the ability of the HVAC controller to interpret the desired action.
Correction
Cycling the key to the off position will power off the HVAC controller and reset it, restoring normal function to the HVAC system on the next vehicle start. Instruct the customer that this is a normal function of the unit and that no repairs are necessary.
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Heres some things you may want to check!!
Document ID# 376618
1999 Chevrolet/Geo Corvette
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Intermittents and Poor Connections
Intermittent failures in electronic systems may be very difficult to detect and accurately diagnose. For this reason, a thorough test drive is often needed in order to repeat a fault condition. If the system malfunction is not repeated during the test drive, a good description of the complaint may be useful in locating an intermittent malfunction. Faulty wires or connections cause most intermittent problems. When an intermittent condition is suspected, inspect the suspected circuits for the following conditions:
Poor mating of connector halves of backed out terminals
Improperly formed or damaged terminals
Wire chafing
Poor wire to terminal connections
Dirty or corroded terminals
Connector body damage
History DTCs are those indicating that the HVAC Control Assembly has previously detected a malfunction. The reason could be either that the malfunction is intermittent or that the system for which the DTC is set for is not currently being operated. History DTCs help in diagnosing intermittent fault conditions but do not necessarily indicate a faulty HVAC Control Assembly. The HVAC Control Head is a reliable component, and is not the likely cause of the malfunction. Most system complaints are linked to faulty wiring and connectors, and occasionally to a component. Perform a thorough inspection of all related wiring and connectors pertaining to the history DTC that is stored.
The following conditions may result in intermittent HVAC Control Assembly operation with no DTC stored:
Any condition which results in the interruption of power to the HVAC Control Assembly.
The battery or ignition voltage is out of range (below 9.0 volts or above 16.0 volts).
A loose or damaged ground.
An open or a short on the serial data line.