A/C - Revised VDOT Diagnosis Charts

9219oldsmobile03

NUMBER: 90-T-81

CORP.REF.NO: 031205, 071202

DATE: May 1990

SECTION: 1B


SUBJECT:
SERVICE MANUAL UPDATE - SECTION 1B AIR CONDITIONING VDOT DIAGNOSIS CHARTS (NEW CHARTS)

MODELS/YEARS:
1989 CUTLASS CALAIS - 1990 CUTLASS CALAIS,
CUTLASS CIERA, CUTLASS SUPREME AND
SILHOUETTE MODELS


The VDOT (Variable Displacement Orifice Tube) diagnosis charts have been revised. The following charts should be used when diagnosing the VDOT System for the following Service Manuals.

Models Affected:

1989 Cutlass Calais Section 1B, Pages 1B-8 through 1B-15
1990 Cutlass Calais Section 1B, Pages 1B-8 through 1B-15
1990 Cutlass Ciera Section 1B2, Pages 1B2-8 through 1B2-14
1990 Cutlass Supreme Section 1B, Pages 1B-9 through 1B-15
1990 Silhouette Section 1B, Pages 1B-17 through 1B-24





Diagnostic Procedures and STEP 1 -- Preliminary Checks





Step 2 - Checking Refrigerant Charge





Step 3 - Checking Compressor Clutch Engagement








Step 4 - Checking System Performance





STEP 5 - Grey Area Diagnosis And Service





STEP 6 - Striped Area Diagnosis And Service





STEP 7 - Control Valve Diagnosis