Contents: Insufficient heating of the air in… ↧ Electric fan ↧ Incorrect air distribution or no… ↧ Too much heat ↧ Governing bodies ↧ Fan noise ↧
Insufficient heating of the air in the cabin or windshield
Warning! When heated, the pressure in the cooling system increases. Removing the expansion tank cap when the engine has not cooled down enough may result in injury.
| Step | Operation | Values | Yes | No |
| 1 |
Ensure that the customer's complaint is confirmed.
Are the customer's complaints confirmed?
|
-
|
Jump to operations 2
|
The system is normal
|
| 2 |
Check the coolant level.
Is the coolant level normal?
|
-
|
Jump to operations 4
|
Jump to operations 3
|
| 3 |
Add coolant if necessary.
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 4
|
| 4 |
Check the tension and absence of damage to the drive belts.
Are the drive belts OK?
|
-
|
Jump to operations 6
|
Jump to operations 5
|
| 5 |
Eliminate any identified defects in drive belts.
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 6
|
| 6 |
Check coolant hoses for leaks or kinks.
Are the coolant hoses OK?
|
-
|
Jump to operations 8
|
Jump to operations 7
|
| 7 |
Troubleshoot coolant hoses.
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 8
|
| 8 |
Check the expansion tank cap for leaks.
Is the expansion tank cap OK?
|
-
|
Jump to operations 10
|
Jump to operations 9
|
| 9 |
If necessary, replace the expansion tank cap.
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 10
|
| 10 |
Is there a strong air flow from the heater outlet?
|
-
|
Jump to operations 11
|
Jump to operations 26
|
| 11 |
Check for changes in air flow by changing the fan speed.
Does the fan speed increase when switching from minimum to maximum?
|
-
|
Go to operations 12
|
|
| 12 |
Is there any visible movement of coolant?
|
-
|
Jump to operations 14
|
Jump to operations 13
|
| 13 |
Have the problems been resolved?
|
-
|
The system is normal
|
Jump to operations 14
|
| 14 |
Does the heater outlet temperature correspond to the specified minimum values?
|
Surrounding
-18°C (0°F)
-4°C (25°F)
10°C (50°F)
24°C (75°F)
Heater outlet
54°C (129°F)
59°C (138°F)
64°C (147°F)
68°C (154°F)
|
Go to operations 15
|
Jump to operations 16
|
| 15 |
Have the problems been resolved?
|
-
|
The system is normal
|
-
|
| 16 |
Does the damper click?
|
-
|
Go to operations 18
|
Jump to operations 17
|
| 17 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 18 |
Is the heater inlet hose hot and the heater outlet hose warm?
|
-
|
Jump to operations 19
|
Jump to operations 22
|
| 19 |
Check the thermostat. See. section 1D, "Engine Cooling".
Is the thermostat installed and sealed correctly?
|
-
|
Jump to operations 20
|
Jump to operations 21
|
| 20 |
Replace thermostat. See. section 1D, "Engine Cooling".
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 21 |
Install the thermostat back into place.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 22 |
Check that the heater hoses are installed correctly.
Are the heater hoses connected backwards?
|
-
|
Jump to operations 23
|
Jump to operations 24
|
| 23 |
Install the heater hoses correctly.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 24 |
Is the heater inlet hose hot and the heater outlet hose warm?
|
-
|
The system is normal
|
Jump to operations 25
|
| 25 |
Replace the heater heat exchanger.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 26 |
Recheck the system according to the "Control Position/Correct Results" test procedures. See "Incorrect air distribution or no mode switching" in this section.
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 27
|
| 27 |
Check air flow from the defroster vents or vents.
Is there strong air flow from the defroster vents or vents?
|
-
|
Jump to operations 28
|
Jump to operations 29
|
| 28 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 29 |
Set the mode switch to the glass heating position.
Is the air flow of the heated glass ok?
|
-
|
Jump to operations 30
|
Jump to operations 31
|
| 30 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 31 |
Check the change in air flow at different fan speeds.
Does the fan speed increase when switching from position 1 to position 4?
|
-
|
Jump to operations 32
|
|
| 32 |
Check for obstructions in the system at the fan inlet and on the air filter, if the vehicle is equipped with one.
Are any obstacles detected?
|
-
|
Jump to operations 33
|
Jump to operations 34
|
| 33 |
Remove obstructions from the fan inlet system or replace clogged filter.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 34 |
Does the air flow change?
|
-
|
Jump to operations 35
|
Jump to operations 36
|
| 35 |
Is the renovation finished?
|
-
|
Jump to operations 1
|
-
|
| 36 |
Is the renovation finished?
|
-
|
Jump to operations 1
|
-
|
Electric fan
| Step | Operation | Values | Yes | No |
| 1 |
Ensure that the customer's complaint is confirmed.
Are the customer's complaints confirmed?
|
-
|
Jump to operations 2
|
The system is normal
|
| 2 |
Turn on the fan.
Does the fan run at any speed?
|
-
|
Jump to operations 14
|
Jump to operations 3
|
| 3 |
Is there tension?
|
11-14 V
|
Jump to operations 4
|
Jump to operations 5
|
| 4 |
Replace the electric fan.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 5 |
Check fuse F18 in the engine fuse box.
Is the fuse blown?
|
-
|
Jump to operations 6
|
Jump to operations 7
|
| 6 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 7 |
Is the mass ok?
|
-
|
Jump to operations 9
|
Jump to operations 8
|
| 8 |
Repair the fan ground connection.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 9 |
Check the electric motor connector with a 12 volt test lamp.
Does the indicator light come on?
|
-
|
Jump to operations 10
|
Jump to operations 11
|
| 10 |
Repair the break in the power supply wiring from the resistor block to the electric fan.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 11 |
Using a 12-volt test light, check the power terminals at the fan speed switch.
Does the lamp light up?
|
-
|
Go to operations 12
|
Jump to operations 13
|
| 12 |
Replace the fan speed switch.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 13 |
Repair open in power supply wiring from fan speed switch to fuse panel.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 14 |
Turn on the fan at speed 4.
Fan not working at speed 4?
|
-
|
Go to operations 15
|
Jump to operations 21
|
| 15 |
Check fuse EF2 in the engine fuse box.
Is the fuse blown?
|
-
|
Jump to operations 16
|
Jump to operations 17
|
| 16 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 17 |
Is there tension?
|
-
|
Go to operations 18
|
Jump to operations 19
|
| 18 |
Replace the fan speed switch.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 19 |
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 20
|
| 20 |
Replace high speed fan relay.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 21 |
Does the test light come on at all terminals?
|
-
|
Jump to operations 23
|
Jump to operations 22
|
| 22 |
Replace the resistor block.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 23 |
Does the test light come on on all three wires?
|
-
|
Jump to operations 25
|
Jump to operations 24
|
| 24 |
Replace the fan speed switch.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 25 |
Repair the break in the damaged wire.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
Incorrect air distribution or no mode switching
This procedure includes checking all functions of the interior heating system and windows.
1. Warm up the car.
2. Leave the engine running.
3. Perform the tests described in the following table and compare the results obtained.
|
STATUS OF GOVERNING BODIES
|
CORRECT RESULTS
|
|||||||
|
Mode switch knob
|
Temperature regulator.
|
FAN SWITCH
|
FAN SPEED
|
Side exhaust air vent
|
Central exhaust vent
|
FLOOR OUTLET
|
GLASS HEATING RELEASE
|
SIDE WINDOW RELEASE
|
|
Ventilation
|
Cold
|
Off.
|
Off.
|
No air flow
|
No air flow
|
No air flow
|
No air flow
|
No air flow
|
|
Ventilation
|
Cold
|
4
|
Tall
|
Outside air flow
|
Outside air flow
|
No air flow
|
No air flow
|
No air flow
|
|
Hole
|
from cold to warm
|
4
|
Tall
|
Minimum air flow from cold to warm
|
No air flow
|
Air flow from cold to warm
|
Minimum air flow from cold to warm
|
Minimum air flow from cold to warm
|
|
Glass heating (Defroster)
|
from cold to warm
|
4
|
Tall
|
Minimum air flow from cold to warm
|
No air flow
|
Minimum air flow from cold to warm
|
Air flow from cold to warm
|
Minimum air flow from cold to warm
|
If any of these positions do not produce correct results, perform the following diagnostic procedure.
| Step | Operation | Values | Yes | No |
| 1 |
Ensure that the customer's complaint is confirmed.
Are the customer's complaints confirmed?
|
- |
Jump to operations 2
|
The system is normal
|
| 2 |
Is everything connected correctly?
|
-
|
Jump to operations 4
|
Jump to operations 3
|
| 3 |
Repair if necessary.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 4 |
Does the valve move easily throughout its entire stroke and does it close at both ends of the stroke?
|
-
|
Jump to operations 5
|
Jump to operations 3
|
| 5 |
Check the working stroke of the drive by turning the regulator handle with the engine running.
Is the drive stroke OK?
|
-
|
Jump to operations 6
|
Jump to operations 7
|
| 6 |
Is the system functioning properly?
|
-
|
The system is normal
|
Jump to operations 9
|
| 7 |
Is there a problem with the vacuum hose or actuator control?
|
-
|
Jump to operations 8
|
Jump to operations 9
|
| 8 |
If necessary, repair the vacuum hose or control actuator.
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 9
|
| 9 |
Recheck the system according to the "Control Position/Correct Results" test procedures in this section.
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 10
|
| 10 |
Check air flow from the defroster vents or vents.
Is there strong air flow from the defroster vents or vents?
|
-
|
Jump to operations 11
|
Go to operations 12
|
| 11 |
Adjust the floor heater flap and ventilation flap to obtain normal air flow.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 12 |
Set the mode switch to the glass heating position.
Is the air flow of the heated glass ok?
|
-
|
Jump to operations 13
|
Jump to operations 14
|
| 13 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 14 |
Check the change in air flow at different fan speeds.
Does the fan speed increase when switching from position 1 to position 4?
|
-
|
Go to operations 15
|
|
| 15 |
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 16
|
| 16 |
Does the air flow change?
|
-
|
Jump to operations 17
|
Go to operations 18
|
| 17 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 18 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
Too much heat
| Step | Operation | Values | Yes | No |
| 1 |
Ensure that the customer's complaint is confirmed.
Are the customer's complaints confirmed?
|
-
|
Jump to operations 2
|
The system is normal
|
| 2 |
Is the heating too strong when the mode switch is set to floor?
|
-
|
Jump to operations 3
|
Jump to operations 9
|
| 3 |
Is there unwanted air flow from the glass heating system?
|
-
|
Jump to operations 4
|
Jump to operations 5
|
| 4 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 5 |
Is the air flow strong?
|
-
|
Jump to operations 6
|
Jump to operations 8
|
| 6 |
Check the change in air flow at different fan speeds.
Does the air flow change when changing fan speed?
|
-
|
Jump to operations 7
|
|
| 7 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 8 |
Adjust or repair the system in the "floor/window heating" and/or "ventilation/floor" mode.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 9 |
Is there any unwanted air flow in the vent position?
|
-
|
Jump to operations 10
|
Jump to operations 15
|
| 10 |
Are there any problems found?
|
-
|
Jump to operations 11
|
Go to operations 12
|
| 11 |
If necessary, repair the system body or floor outlet mount.
Is the renovation finished?
|
-
|
The system is normal
|
Go to operations 12
|
| 12 |
Is there a clicking sound from the throttle just before the adjuster reaches the stop?
|
-
|
Jump to operations 13
|
Jump to operations 14
|
| 13 |
Adjust the ventilation flap to a wider opening.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 14 |
Is the temperature valve operating normally?
|
-
|
The system is normal
|
-
|
| 15 |
Is the exhaust air warmer than the intake air by more than 5°C (41°F)?
|
-
|
Jump to operations 16
|
The system is normal
|
| 16 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
Governing bodies
| Step | Operation | Values | Yes | No |
| 1 |
Ensure that the customer's complaint is confirmed.
Are the customer's complaints confirmed?
|
-
|
Jump to operations 2
|
The system is normal
|
| 2 |
Operate the controls except the temperature regulator.
Do the controls require excessive force to move?
|
-
|
Go to operations 15
|
Jump to operations 3
|
| 3 |
Move the temperature control.
Do the controls require excessive force to move?
|
-
|
Jump to operations 6
|
Jump to operations 4
|
| 4 |
Move the temperature control.
Does the temperature flap move too easily?
|
-
|
Jump to operations 5
|
The system is normal
|
| 5 |
Disconnect the cable from the regulator.
Does the control knob rotate freely without the lock clicking?
|
-
|
Go to operations 15
|
-
|
| 6 |
Check the cables for proper routing, kinks, or contact with wiring or other parts of the instrument panel.
Are there any problems found?
|
-
|
Jump to operations 7
|
Jump to operations 8
|
| 7 |
Repair if necessary.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 8 |
Is the damper sticking?
|
-
|
Jump to operations 9
|
Go to operations 12
|
| 9 |
Check the jammed valve for correct axis position, bent axis or warped housing.
Is the damper seal OK?
|
-
|
Jump to operations 10
|
Jump to operations 11
|
| 10 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 11 |
If necessary, repair the damper seal.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 12 |
Check the regulator for sticking.
Is the regulator sticking?
|
-
|
Jump to operations 14
|
Jump to operations 13
|
| 13 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 14 |
Is the regulator sticking?
|
-
|
Go to operations 15
|
Jump to operations 16
|
| 15 |
Replace the regulator.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 16 |
Replace the cable.
Is the renovation finished?
|
-
|
The system is normal
|
-
|
Fan noise
| Step | Operation | Values | Yes | No |
| 1 |
Ensure that the customer's complaint is confirmed.
Are the customer's complaints confirmed?
|
-
|
Jump to operations 2
|
The system is normal
|
| 2 |
Is there continuous noise at high fan speed or in certain modes, but no noise at low speed or in other modes?
|
-
|
Jump to operations 11
|
Jump to operations 3
|
| 3 |
Check the vibration of the electric motor or fan assembly at each fan speed by feeling the electric fan housing.
Do you feel excessive vibration?
|
-
|
Jump to operations 6
|
Jump to operations 4
|
| 4 |
Are there any foreign objects found in the fan inlet?
|
-
|
Jump to operations 5
|
Jump to operations 6
|
| 5 |
Remove all foreign objects.
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 6
|
| 6 |
Was any fault found?
|
-
|
Jump to operations 7
|
Jump to operations 9
|
| 7 |
Repair if necessary.
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 8
|
| 8 |
Replace the electric motor and fan assembly.
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 9
|
| 9 |
If the noise is clicking/ticking or howling, replace the motor.
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 10
|
| 10 |
Install the original motor in place.
Does the problem reoccur?
|
-
|
Jump to operations 11
|
The system is normal
|
| 11 |
Is the noise present only in the glass heating mode?
|
-
|
Go to operations 12
|
Jump to operations 13
|
| 12 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 13 |
Is the noise present only in floor blowing mode?
|
-
|
Go to operations 12
|
Jump to operations 14
|
| 14 |
Is the noise present only in ventilation mode?
|
-
|
Go to operations 15
|
Jump to operations 16
|
| 15 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 16 |
Is the noise present in all modes, but not in all positions of the temperature control?
|
-
|
Jump to operations 17
|
Go to operations 18
|
| 17 |
Is the renovation finished?
|
-
|
The system is normal
|
-
|
| 18 |
Is the renovation finished?
|
-
|
The system is normal
|
Jump to operations 2
|
[The article was borrowed from the website «chevyman.ru»]
