DR-18B Heated Air Intake System

Complete Driveability Test 18-Step A, before proceeding.
This test must be performed with engine COLD.
1. Disconnect air duct from air cleaner snorkel.
2. Disconnect vacuum supply hose to heated air intake system air temperature sensor.
3. Connect an auxiliary vacuum supply to the air temperature sensor and apply at least 15 inches vacuum to the sensor.
4. If vacuum builds up, then bleeds down opening the door, proceed to Test 20 for Federal models or Test 21 for California models.
5. If vacuum builds up but door does not close, repair or replace door as required.
6. If vacuum does not build up or does not bleed down, replace air temperature sensor.
7. If vacuum builds up and bleeds down but door does not open, repair or replace door as required.