-
No warm air comes out
(Blower control is normal)
-
Outlet air temperature does not increase
(Blower control is normal)
| Last Modified: 06-05-2026 | 6.11:8.1.0 | Doc ID: RM100000001H983 |
| Model Year Start: 2020 | Model: Corolla HV | Prod Date Range: [01/2019 - 09/2022] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): No Warm Air Comes Out; 2020 - 2022 MY Corolla HV [01/2019 - 09/2022] | ||
|
No Warm Air Comes Out |
DESCRIPTION
If cool air blows from the registers regardless of the temperature setting of the air conditioning system, the following factors may be the cause.
|
Symptom |
Factor |
|---|---|
|
|
|
- *: w/ PTC Heater
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List.
(e) Read the Data List according to the display on the Techstream.
Powertrain > Engine > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Coolant Temperature |
Engine coolant temperature |
Min.: -40°C (-40°F), Max.: 140°C (284°F) |
75 to 100°C (167 to 212°F): After warming up |
This is the engine coolant temperature. HINT:
|
Powertrain > Engine > Data List
OK:
After warming up the engine, the temperature value displayed is within the range specified in the normal condition column.
| NG |
|
GO TO COOLING SYSTEM Click here
|
![2020 MY Corolla HV [01/2019 - 04/2020]; 2ZR-FXE (COOLING): COOLING SYSTEM: ON-VEHICLE INSPECTION](/t3Portal/stylegraphics/info.gif)
|
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Air Mix Servo Targ Pulse(D) |
No. 1 air conditioning radiator damper servo sub-assembly pulse |
Min.: 128 Max.: 383 |
Operates between 165 and 257 pulses |
Body Electrical > Air Conditioner > Active Test
OK:
The No. 1 air conditioning radiator damper servo motor operates.
| NG |
|
GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR Click here
|
|
|
3. |
CONFIRM MODEL |
(a) Choose the model to be inspected.
Result
|
Result |
Proceed to |
|---|---|
|
w/ PTC Heater |
A |
|
w/o PTC Heater |
B |
| B |
|
REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY Click here
|
|
|
4. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test / Heater Active Level / Data List / Electric Heater Active Level.
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Heater Active Level |
Quick heater assembly |
Min.: 0 Max.: 3 |
- |
Body Electrical > Air Conditioner > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Electric Heater Active Level |
Actual electric heater operation level |
Min.: 0 Max.: 3 |
Actual operation level of electric heater displayed |
PTC heater circuit malfunction |
Body Electrical > Air Conditioner > Active Test
(e) Check that the value of the Data List item Electric Heater Active Level changes in accordance with the set value of the Active Test item Heater Active Level.
OK
|
Techstream Operation |
Data List (Electric Heater Active Level) |
|---|---|
|
0 to 3 |
0 to 3 |
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