D21 Hardbody 2WD L4-2389cc 2.4L SOHC MFI (KA24E) (1990)
A/C Relay: Description and Operation
The A/C relay (BLUE), located on the R.F. fender apron between the relay box and the firewall, signals the ECU when the A/C compressor is
engaged. The ECU can then raise the idle to compensate for the added load.