Control Assembly: Testing and Inspection

TESTING AND INSPECTION (MANUAL A/C ONLY)

NOTE: For testing of Auto A/C equipped systems, refer to Electronic Climate Control.




The PTC is built into the control unit. It has a variable resistance which changes according to the set temperature. This resistance is connected to the temperature control lever.




PTC
After disconnecting PTC harness connector, measure resistance between terminals 1 and 2 at PTC harness side.







PBR
Measure resistance between terminals 1 and 2 at vehicle harness side.




Ignition Switch: ON
- Ensure tester pointer deflects smoothly when PTC is moved from full cool to full hot and vice versa.