Toyota has a service bulletin for this issue.
Conversion Calculator 2002 Toyota Corolla LE Sedan L4-1.8L (1ZZ-FE)
Vehicle Level Heating and Air Conditioning Technical Service Bulletins All Technical Service Bulletins A/C - Inoperative/A/C Light Flashing
A/C - Inoperative/A/C Light FlashingNotes
A/C LIGHT FLASHING - MAGNETIC
'01 - '04 Camry, ECHO, & Celica
'02 - '04 4Runner, Corolla, & MR2 Spyder
'03 - '04 Highlander, Matrix, Sienna, & Solara
June 3, 2005
This bulletin is to provide information regarding countermeasures to the A/C magnetic clutch relay
for A/C light flashing (inoperative A/C) issues on some vehicles equipped with a magnetic clutch compressor.
^2001 - 2004 model year Camry, ECHO, and Celica vehicles.
^2002 - 2004 model year 4Runner, Corolla, and MR2 Spyder vehicles.
^2003 - 2004 model year Highlander, Matrix, Sienna, and Solara vehicles.
1.Locate the A/C magnetic clutch relay
2.Verify the part number printed on the side of the relay.
A.If the part number is 90987-02022, please replace the relay with the countermeasured relay P/N 90987-02028.
B.If the part number does not match 90987-02022, then please diagnose problems by referring to the Technical Information System (TIS): applicable model year and vehicle Repair Manual: Air Conditioning: Troubleshooting.
:Relays other than P/N 90987-02028 should not be used for this application.