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Diagnostic Procedure
1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under
TROUBLE SHOOTING. Go to next step.
2. Connect scan tool. Turn ignition on. Observe LH MIX MTR POSITION FEEDBACK
parameter in HVAC data list. If scan tool indicates LH MIX MTR POSITION
FEEDBACK parameter is between 5-250 counts, see DIAGNOSTIC AIDS . If scan tool
indicates LH MIX MTR POSITION FEEDBACK parameter is not between 5-250 counts,
go to next step.
3. Turn ignition off. Disconnect left air temperature actuator. Turn ignition on. Observe LH
MIX MTR POSITION FEEDBACK parameter in HVAC data list. If scan tool indicates
LH MIX MTR POSITION FEEDBACK parameter is more than 250 counts, go to next
step. If scan tool indicates LH MIX MTR POSITION FEEDBACK parameter is 250 counts
or less, go to step 8 .
4. Turn ignition off. Connect a fused jumper wire between terminals No. 9 (Light Blue wire)
and No. 7 (Gray/Black wire) of left air temperature actuator. Turn ignition on. Observe LH
MIX MTR POSITION FEEDBACK parameter in HVAC data list. If scan tool indicates
LH MIX MTR POSITION FEEDBACK parameter is less than 5 counts, go to next step. If
scan tool indicates LH MIX MTR POSITION FEEDBACK parameter is 5 counts or more,
go to step 9 .
5. Turn ignition off. Connect a fused jumper wire between terminals No. 9 (Light Blue wire)
and No. 10 (Yellow wire) of left air temperature actuator. Turn ignition on. Observe LH
MIX MTR POSITION FEEDBACK parameter in HVAC data list. If scan tool indicates
LH MIX MTR POSITION FEEDBACK parameter is more than 250 counts, go to step 9 .
If scan tool indicates LH MIX MTR POSITION FEEDBACK parameter is 250 counts or
less, go to next step.
6. Disconnect left air temperature actuator harness connector. Check continuity between
ground and terminal No. 10 (Yellow wire) of left air temperature actuator. If continuity
exists, repair short to ground in Yellow wire between left air temperature actuator and
terminal C10 of HVAC control head. After repair, go to step 15 . If continuity does not
exist, go to step 12 .
7. Turn ignition off. Measure voltage between ground and terminal No. 10 (Yellow wire) of
left air temperature actuator. If voltage exists, repair short to voltage in Yellow wire
between left air temperature actuator and terminal C10 of HVAC control head. After repair,
go to step 15 . If voltage does not exist, go to step 11 .
8. Measure continuity between ground and terminal No. 9 (Light Blue wire) of left air
temperature actuator. If continuity exists, repair short to ground in Light Blue wire between
left air temperature actuator and terminal C8 of HVAC control head and go to step 15 . If
voltage does not exist, go to step 12 .
2001 Chevrolet Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
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