GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2001 🢒 Firebird 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Too Cold in Vehicle

Step

Action

Yes

No

Schematic Reference: HVAC Schematics

DEFINITION: Temperature can not be adjusted or heating insufficient.

1

Did you perform the HVAC Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - HVAC Systems - Manual

2
  1. Turn ON the ignition, with the engine OFF.
  2. Place the mode switch in any position except OFF.
  3. Place the blower control in each speed position.

Does the blower motor operate at all?

Go to Step 3

Go to Blower Motor Inoperative

3

Does the blower motor operate correctly for each speed position?

Go to Step 4

Go to Blower Motor Malfunction

4

Inspect the cooling system for the following conditions:

  1. A low coolant level
  2. A loose or worn accessory drive belt
  3. leaking radiator hose or heater hose
  4. A kinked radiator hose or heater hose
  5. Missing radiator cap pressure seal
  6. A leaking radiator cap

Did you find and correct the condition?

Go to Step 8

Go to Step 5

5
  1. Start the engine.
  2. Place the mode switch in the OFF, VENT or HEAT positions.

Does the A/C compressor operate?

Go to HVAC Compressor Clutch Does Not Disengage

Go to Step 6

6

Inspect the air temperature cable for the following:

    • Broken or binding linkages
    • A broken or binding cable

Did you find and correct the condition?

Go to Step 8

Go to Step 7

7

Inspect the air temperature door for the following conditions:

    • Broken or binding linkages
    • A broken or binding air temperature door
    • Obstruction that prevents the air temperature door from operating within it's full range of motion

Did you find and correct the condition?

Go to Step 8

Go to Heating Performance Diagnostic

8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2