Heater blows only cold air

Hi and thanks for using 2CarPros. Com.

The air mix actuator is under the dash mounted on the side of the HVAC unit. See picture 1.

The directions for replacement are simple (once you locate the component). As far as the connector, it is plastic and will have a plastic tab on it. Depress the tab with your thumb and it should come off. It is a 7 pin connector, so it isn't too small.

Here are the directions from Alldata for replacement: Picture 2 correlates with these directions.

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Air Mix Control Motor Replacement

1. Disconnect the 7P connector (A) from the air mix control motor (B). Remove the self-tapping screws and the air mix control motor from the heater unit.

2. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly engaged with the linkage. After installation, make sure the motor runs smoothly.

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Here is a test if you would like to confirm that is the problem. Pictures 3 and 4 correlate with these directions.

AIR MIX CONTROL MOTOR TEST (WITHOUT CLIMATE CONTROL)
Air Mix Control Motor Test

Special Tools Required

- Backprobe Set 07SAZ-001000A (2)

NOTE: Before testing the motor, check for HVAC DTCs See: Heating and Air Conditioning > Initial Inspection and Diagnostic Overview > How To Troubleshoot The Heating And A/C Systems (Without Climate Control).

1. Disconnect the 7P connector from the air mix control motor.

NOTICE
Incorrectly applying power and ground to the air mix control motor will damage it. Follow the instructions carefully.

2. Connect battery power to terminal No. 1 of the air mix control motor, and ground terminal No. 2; the air mix control motor should run, and stop at Max Hot. If it does not, reverse the connections; the air mix control motor should run, and stop at Max Cool. When the air mix control motor stops running, disconnect battery power immediately.
3. If the air mix control motor did not run in step 2, remove it, then check the air mix control linkage and door for smooth movement.

- If the linkage and door move smoothly, replace the air mix control motor See: Air Door Actuator / Motor, HVAC > Removal and Replacement > Air Mix Control Motor Replacement (Without Climate Control).
- If the linkage or door sticks or binds, repair them as needed.
- If the air mix control motor runs smoothly, go to step 4.

4. Measure the resistance between terminals No. 5 and No. 7 of the air mix control motor. It should be between 4.2 and 7.8 kOhms.

5. Reconnect the air mix control motor 7P connector, then turn the ignition switch to ON (II).
6. Using the backprobe set (07SAZ-001000A), measure the voltage between terminals No. 3 and No. 7.
7. If either the resistance or the voltage readings are not as specified, replace the air mix control motor See: Air Door Actuator / Motor, HVAC > Removal and Replacement > Air Mix Control Motor Replacement (Without Climate Control).

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If you have other questions or need additional help, let me know.

Take care,
Joe

Hi and let me know what you find. As far as the climate control, the aforementioned directions really relate to that as well. Let me know what you find.

That is great news. It sounds like the connection may have been loose. Take care and let us know if you have questions in the future.

Stay warm!

Joe