Step | Action | Yes | No | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: Component Connector End Views | |||||||||||
1 | Verify the customer's complaint. Are the customer's concerns verified? | Go to Step 2 | System OK | ||||||||
2 | Inspect the coolant level. Is the coolant level correct? | Go to Step 4 | Go to Step 3 | ||||||||
3 | Add coolant as needed. Did you complete the repair? | System OK | Go to Step 4 | ||||||||
4 | Inspect the timing belt for tension or damage. Are the drive belts OK? | Go to Step 6 | Go to Step 5 | ||||||||
5 | Correct any problem with the timing belts. Did you find and correct the condition? | System OK | Go to Step 6 | ||||||||
6 | Inspect the coolant hoses for leaks or kinks. Are the coolant hoses OK? | Go to Step 8 | Go to Step 7 | ||||||||
7 | Repair any problem with the coolant hoses. Did you complete the repair? | System OK | Go to Step 9 | ||||||||
8 | Inspect the surge tank cap. Is the surge tank cap OK? | Go to Step 10 | Go to Step 9 | ||||||||
9 | Repair or replace the surge tank caps, as needed. Did you find and correct the condition? | System OK | Go to Step 10 | ||||||||
10 |
Is the heavy airflow from the heater outlet? | Go to Step 11 | Go to Step 26 | ||||||||
11 | Inspect for a change in the airflow at various blower speeds. Does the blower speed increase as the switch is turned from 1 to 4? | Go to Step 12 | Go to Blower Motor Malfunction | ||||||||
12 |
Is the coolant flow visible? | Go to Step 14 | Go to Step 13 | ||||||||
13 |
Did you find and correct the condition? | System OK | Go to Step 14 | ||||||||
14 |
Does the heater output meet the minimum values given in the table? | Go to Step 15 | Go to Step 16 | ||||||||
15 |
Did you find and correct the condition? | System OK | -- | ||||||||
16 |
Does the door slam? | Go to Step 18 | Go to Step 17 | ||||||||
17 |
Did you find and correct the condition? | System OK | -- | ||||||||
18 |
Is the heater inlet hose warmer than the heater outlet hose? | Go to Step 19 | Go to Step 22 | ||||||||
19 | Inspect the thermostat. Refer to Thermostat Diagnosis . Is the thermostat installed and seated properly? | Go to Step 20 | Go to Step 21 | ||||||||
20 | Replace the thermostat. Refer to Engine Coolant Thermostat Replacement . Did you complete the replacement? | System OK | -- | ||||||||
21 | Reinstall the thermostat. Did you complete the repair? | System OK | -- | ||||||||
22 | Inspect the heater hoses for proper installation. Are the heater hoses reversed? | Go to Step 23 | Go to Step 24 | ||||||||
23 | Reinstall the heater hoses properly. Did you complete the repair? | System OK | -- | ||||||||
24 |
Is the heater inlet hose warmer than the heater outlet hose? | System OK | Go to Step 25 | ||||||||
25 | Replace the heater core. Did you complete the replacement? | System OK | -- | ||||||||
26 | Verify the system using the Control Settings/Correct Results tests. Refer to Air Delivery Improper . Did you find and correct the condition? | System OK | Go to Step 27 | ||||||||
27 | Inspect for airflow from the defroster or the vent outlets. Is the airflow high from the defroster or vent outlets? | Go to Step 28 | Go to Step 29 | ||||||||
28 |
Did you find and correct the condition? | System OK | -- | ||||||||
29 | Switch the mode knob to defrost. Is the defroster airflow OK? | Go to Step 30 | Go to Step 31 | ||||||||
30 |
Did you find and correct the condition? | System OK | -- | ||||||||
31 | Inspect for airflow change at various blower speeds. Does the blower speed increase as the control is turned from 1 to 4? | Go to Step 32 | Go to Blower Motor Malfunction | ||||||||
32 | Inspect for obstructions in the system at the blower inlet and at the air filter. Did you find any obstructions? | Go to Step 33 | Go to Step 34 | ||||||||
33 | Remove the obstructions in the system at the blower inlet or replace a clogged filter Did you find and correct the condition? | System OK | -- | ||||||||
34 |
Does the airflow change? | Go to Step 35 | Go to Step 36 | ||||||||
35 |
Is the repair complete? | Go to Step 1 | -- | ||||||||
36 |
Did you find and correct the condition? | Go to Step 1 | -- |