Previa Van 4WD L4-148.8 2438cc 2.4L DOHC (2TZ-FE) (1991)
Vacuum Controller: All Technical Service Bulletins
A/C - Drone Noise During Slight Acceleration
HEATING & AIR
REFERENCE CONDITIONING
NUMBER 011
DATE
12-14-90
MODEL
AC
TITLE:
'91 PREVIA DRONE NOISE DURING SLIGHT ACCELERATION WITH A/C "ON"
To reduce a drone noise found on '91 Previas during light acceleration with the A/C "ON", the tension of the Air Switching Valve (ASV) diaphragm
spring has been decreased.
PRODUCTION EFFECTIVE:
Starting VIN:
P/D
JT3AC10**L0019000
6/90
JT3AC20**L0002600
6/90
PART NUMBER INFORMATION:
Affected Part Number:
Description:
P/N 88606-28020
Diaphragm
Part Number remains unchanged.
Parts in stock are of the improved type.
IDENTIFICATION METHOD:
The ASV Diaphragm has a Build Date Number on the diaphragm canister next to the vacuum line fitting (see diagrams below). Improved parts will have
a Build Date Number of 6K or greater.