Table of Contents
Advertisement
TROUBLE DIAGNOSIS
INSUFFICIENT HEATING OR DEFROSTING
Step
Check the coolant level, the serpentine accessory drive belt for tension
or damage, coolant hoses for leaks or kinks, coolant reservoir cap.
1
Is the repair complete?
1. Set the temperature control switch to full hot.
2. Set the blower motor switch on 4.
3. Turn the ignition ON.
2
4. Check for the airflow from the vent outlet.
Is there a heavy airflow from the vent outlet?
Recheck the Heater system and then repair as needed.
3
Does the system operate properly?
Check for change in the airflow at various blower speeds.
4
Does the blower speed increase as the switch is turned from 1 to 4?
With the engine idle, remove the coolant reservoir cap and watch the
flow of the coolant.
5
Is the coolant flow visible?
1. Check for a restriction in the cooling system, failed water pump
impeller, faulty thermostat.
6
2. Make repairs to the cooling system, as needed.
Is the repairs complete?
Check the airflow from the Defrost and vent outlets.
7
Is there a heavy airflow from there?
1. Check the vehicle for cold air leaks at the Instrument panel, Heater
case and Vents.
8
2. Repair and replace any leaks or obstructions.
Are the repairs complete?
Set all the selection switches to Defrost.
9
Is there a heavy airflow from any step?
Check the vent outlets and repair as needed.
10
Is the repair complete?
Check for change in the airflow at various blower speeds and then repair
as needed.
11
Is the repair complete?
Check for obstructions in the system at the blower inlet and repair as
12
needed.
Is the repair complete?
1. Set the blower motor switch on 4.
2. Slide the temperature control knob from full hot to full cold.
13
3. Listen for an airflow change.
Does the airflow change?
1. Repair the temperature door travel, cables and linkage as required.
14
2. Verify the accuracy of the temperature controls at full hot.
Is the repair complete?
HEATER & VENTILATION SYSTEM
REXTON SM - 2004.4
Action
10B-17
Yes
No
System OK
Go to Step 2
Go to Step 4
Go to Step 3
System OK
Go to Step 7
Go to "Blower
Go to Step 5
Electrical"
Go to Step 6
Go to Step 8
System OK
-
System OK
Go to Step 9
System OK
Go to Step 15
Go to Step 10
Go to Step 11
System OK
-
Go to "Blower
Go to Step 12
Electrical"
System OK
Go to Step 13
Go to Step 14
Go to Step 19
System OK
-
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
Hide quick links:
Advertisement
Table of Contents
