GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Spark 🢒 HVAC 🢒 HVAC - Manual 🢒 Too Hot in Vehicle

Step

Action

Yes

No

1

Verify the customer's complaint.

Are the customer's concerns verified?

Go to Step 2

System OK

2

Set the mode switch to the floor position.

Is there too much heat when the mode switch is in the floor position?

Go to Step 3

Go to Step 8

3

Inspect for defroster bleed.

Is there objectionable defroster bleed?

Go to Step 4

Go to Step 5

4
  1. Inspect the door travel, the cables, the controls, and the linkage for the heater and the defroster.
  2. Adjust or repair, as required.

Is the repair complete?

System OK

--

5
  1. In vehicles equipped with A/C, set the A/C switch OFF.
  2. In all vehicles, set the blower speed to 4.
  3. Set the temperature to full hot.
  4. Turn the ignition switch to ON.
  5. Inspect for airflow from the floor outlets.
  6. Inspect the floor outlet attachment.

Is the airflow high?

Go to Step 7

Go to Step 6

6

Inspect for a change in the airflow at different blower speeds.

Does the airflow change as the setting for the blower-speed switch is changed?

System OK

Go to Blower Motor Malfunction

7
  1. Inspect the temperature door travel, the cables, and the linkage.
  2. Adjust to full cold.
  3. Inspect for full hot.

Is the repair complete?

System OK

--

8

Adjust or repair the floor/defroster and/or the vent/floor mode.

Is the repair complete?

Go to Step 9

--

9

Set the mode switch to the vent position.

In the vent position, is the problem objectionable bleed?

Go to Step 10

Go to Step 15

10
  1. Inspect the system case for leaks.
  2. Inspect the floor outlet attachment.

Are any problems found?

Go to Step 11

Go to Step 12

11

Repair the system case or the floor outlet attachment as required.

Is the repair complete?

System OK

Go to Step 12

12
  1. Turn the ignition switch OFF.
  2. Turn the temperature control knob to full hot, then rapidly to full cold.

Do you hear the door slam just before you reached the end of the control travel?

Go to Step 13

Go to Step 14

13

Adjust the vent door to vent more.

Is the repair complete?

System OK

--

14
  1. Inspect the temperature door travel, the cables, and the linkage.
  2. Verify that the temperature door goes to full cold.
  3. Inspect the temperature door for full hot.

Is the temperature door travel correct?

System OK

Go to Step 15

15
  1. Inspect for hot air leaks from the engine compartment to the blower inlet.
  2. Repair as needed.

Is the repair complete?

System OK

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