Anyone know where I can find a heater control valve for an 88 4r/22RE with the rear aux heater? I've tried the more popular online shops, but I wasn't able to find one. I would really like to avoid the dealer if possible.

 

You can try 1sttoyotaparts.com. Genuine Toyota parts without being raped by the dealer. I've orderd thousands of dollars worth of parts from them.