GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Tracker - 4WD 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Air Delivery Improper

Step

Action

Value(s)

Yes

No

1

Was the Functional Test performed?

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Go to Step 2

Go to Function Test

2
  1. Set the mode to VENT.
  2. Set the temperature control to full COLD.
  3. Set the blower speed to OFF.
  4. There should be no airflow at the following outlets:
    5. • The vent
    • The heater
    • The defroster
    • The side window defroster

Is the airflow correct?

--

Go to Step 3

Go to Step 8

3
  1. Set the blower speed to HI.
  2. Inspect for airflow at the following outlets:
    3. • The vent
    • The heater
    • The defroster
    • The side window defroster

Does air flow through the vent outlets at ambient temperature and no air flow through the heater, defroster and side window defroster outlets?

--

Go to Step 4

Go to Step 8

4
  1. Set the mode to HEAT.
  2. Set the temperature control to full HOT.
  3. Inspect for airflow at the following outlets:
    4. • The vent
    • The heater
    • The defroster
    • The side window defroster
  4. Hot air should flow through the heater outlet with the blower at HI speed, while a minimum of hot air should flow through the defroster and the side window defroster outlets. Also, no airflow should exist at the vent outlets.

Is the airflow correct?

--

Go to Step 5

Go to Step 8

5
  1. Set the mode to DEFROST.
  2. Inspect for airflow at the following outlets:
    3. • The vent
    • The heater
    • The defroster
    • The side window defroster
  3. Hot air should flow through the heater outlet with the blower at HI speed, while a minimum of hot air should flow through the defroster and the side window defroster outlets. Also, no airflow should exist at the vent outlets.

Is the airflow correct?

--

Go to Step 6

Go to Step 8

6
  1. Disconnect the affected control cable(s) at the door(s)
  2. Inspect the door travel and effort.

Are the door travel and effort correct?

--

Go to Step 7

Go to Step 9

7

Test the control cable(s) travel by moving the corresponding control at the heater control unit.

Is the control cable travel correct?

--

Go to Step 10

Go to Step 11

8

Repair the affected control cable(s) as necessary. Refer to the following:

    • Temperature Control Cable Replacement
    • Vent Control Cables Replacement

Is the action complete?

--

Go to Step 12

--

9

Repair the affected door at the heater case as necessary.

Is the action complete?

--

Go to Step 12

--

10

Reinstall the control cable(s).

Is the action complete?

--

Go to Step 12

--

11

Inspect the control cable(s) attachment at the heater control unit. Repair any control cable attachment as necessary.

Is the action complete?

--

Go to Step 12

--

12

Perform the Function Test .

Is the action complete?

--

System OK

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