Heater stopped working?

Welcome to 2CarPros.

The component that determines air flow directions is called a mode door actuator. It sounds like that is where the problem is with your vehicle. Take a look through this link:

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

If that seems to mirror what you are experiencing, then we need to replace the mode door actuator. The mode door actuator is located on the lower left side of the A/C-Heater housing. This actuator controls the position of the panel/bi-level door and the floor/defrost door. Here are the directions for replacement. The attached pictures correlate with the directions.

_____________________________

MODE DOOR ACTUATOR REPLACEMENT
Fig 9 Mode Door Motor Location

Pic 1

NOTE: If battery voltage is low or not sensed at the actuator/motor for less than a (60) second interval, the actuator/motor will be out of calibration. Remove the M1 (I.O.D.) fuse for a minimum of (60) seconds. The actuator/motor will then self calibrate itself upon reinstallation of fuse.

The mode door actuator is an electric motor. It mechanically positions the A/C unit panel/bi-level door and the floor/defrost door. Prior to part replacement, re-calibration of the HVAC actuator is recommended. Calibration is performed by disconnecting the battery negative cable or the removal of the instrument panel M-1 fuse. Electrical power should be re-established after (60) seconds which will automatically initiate the software calibration procedure. If this procedure fails, it will be necessary to replace the mode door actuator/motor. The mode door actuator/motor is not serviceable and must be replaced if found to be defective.

The mode door actuator is located on the upper left side of the A/C-Heater housing.

Fig 10 Mode Motor Connector

pic 2

REMOVAL
1. Disconnect battery negative cable.
2. Remove left underpanel silencer/duct.
3. Remove electrical connection on actuator.
4. Remove actuator retaining screws. Then pull actuator straight down. Upon removal, note the shaft position of the actuator, because the shaft on this motor is keyed. When installing new actuator, its shaft must be positioned in the same location.

INSTALLATION
For installation, reverse the above procedures.

___________________________________________________________

Let me know if that helps or if you have other questions.

Take care,
Joe

First be sure the coolant reservoir is at least half full. If it is not, check to see if the radiator is full.

Is the temperature gauge reading normally or lower than normal? If it is low and the coolant is full, suspect a thermostat that is sticking open.

Next, feel the two heater hoses after the engine has warmed up. They should be too hot to hold onto for very long. If they are cool, suspect a plugged heater core. That can usually be back-flushed with a garden hose.

If the hoses are hot, but you're still getting cold air, suspect a problem with the doors in the heater box, an actuator, or the heater controller.

Check these two items, Thermostat, and heater core. Try warming the Vehicle, then carefully feel the heater hoses, are they both hot? If one is cooler than the other, You need to flush the core, or a replacement job on the heater core. Also if the system has a heat control valve on the heater hose, make sure it is working!