AMC Jeep ET-501 Instruction Manual page 33

CK CSW CKT Test for 82 6-cyl.
NOTE: A dual-function coolant temperature/
intake manifold control switch is used on
models built prior to February 18, 1982.
Separate coolant temperature and intake
manifold heater (EFE) control switches are
used on models built after February 18, 1982.
For complete details refer to Technical
Bulletin No. 1-12-82 dated October 11, 1982.
6-Cylinder 15