Cold Dr2 - Heated Air Intake

1. Remove outside air duct from air cleaner. Remove vacuum hose from heated air door diaphragm. Connect an auxiliary vacuum supply to the diaphragm, and apply 10 in. Hg vacuum. Check position of heated air door in air cleaner snorkel. Vacuum should hold and heated air door should close to outside air.
2. If vacuum does not hold, repair or replace parts as required. If results in step 1) were okay, remove air intake housing. Remove both vacuum hoses from heater air intake sensor.
3. Connect auxiliary vacuum supply to one nipple of sensor, and plug the other. Apply 10 in. Hg vacuum. Vacuum should hold at temperatures of 85°F or less. If not, replace heated air intake sensor. If okay, proceed to next test.

Fig 1: Vacuum Connections, COLD DR2 - Heated Air Intake

Courtesy of CHRYSLER MOTORS.