What temperature should the heater outlet in a 2004 matrix be

Probably an airlock in pipes or matrix,try bleeding hoses.

The heater matrix may be blocked or has an airlock.

Set the heater controls to hot - fully open - and leave them like that when you drive the car. When the car reaches normal operating temperature any air in the heater matrix should be 'bled out'. Then check your coolant level.

If the matrix doesn't have an airlock - it may have a blockage caused by corrosion/limescale. If this is the case, any car parts store should be able to sell you a bottle of something to unblock (if possible) the heater matrix.

A few of the possible problems are: -

Insufficient coolant temperature - possibly defective thermostat.
Insufficient coolant circulation through the heater matrix.
Insufficient airflow through the heater matrix - possibly due to the build up of leaves or other debris.
Maladjusted or broken heater controls.

First find the problem(s)...

Try the temperature sending unit.

Fold down the glove box to observe the movement of the blend door when you switch between A/C & heat.

Sounds like the air blend door is not opening to let heat in.

Engine coolant is provided to the heater system by two 16 mm (5/8 inch inside diameter) heater hoses. With the engine idling at normal running temperature, set the heater-A/C controls as follows. Temperature control to full Heat, Mode control to Floor, Blower control to the highest speed setting. Using a test thermometer, check the air temperature coming from the center floor outlets and compare this reading to the Temperature Reference table.

If the floor outlet air temperature is insufficient, check that the cooling system is operating to specifications. Both heater hoses should be HOT to the touch (the coolant return hose should be slightly cooler than the supply hose). If the coolant return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in heater system.

POSSIBLE LOCATIONS OR CAUSE OF OBSTRUCTED COOLANT FLOW

• Pinched or kinked heater hoses.
• Improper heater hose routing.
• Plugged heater hoses or supply and return ports at cooling system connections.
• Plugged heater core.
• Air locked heater core.
• Restrictor in backwards

If coolant flow is verified and the heater floor outlet temperature is insufficient, a mechanical problem may exist.

POSSIBLE LOCATION OR CAUSE OF INSUFFICIENT HEAT

• Obstructed cowl air intake.
• Obstructed heater system outlets.
• Blend-air door not functioning properly.

TEMPERATURE CONTROL
If heater floor outlet temperature cannot be adjusted with the heater-A/C control temperature control lever, one of the following could require service:

• Blend-air door binding.
• Faulty blend-air door motor.
• Improper engine coolant temperature.
• Faulty heater-A/C control.

it has 2 fuse boxes. one is in the engine bay and the one you want is
under the dash, left of the steering wheel.
you will need fine needle nose pliers, a light and your glasses.

Sounds like the temperature blend door actuator may be bad or the vacuum hose to it is disconnected.

Poor Heater System Performance CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.

1. Start the engine.
2. Idle the engine until the thermostat opens (upper radiator hose will be hot) Is the engine at normal operating temperature (approx. 200° F)? If yes, go to the next step. If no, go to step 16.
3. Set the mode selector to FLOOR mode.
4. Set the heater control selector to the warmest temperature setting.
5. Set the blower speed the lowest setting.
6. Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 14. If no, go to the next step.
7. Set the mode selector to PANEL mode.
8. Select the maximum blower speed.
9. Select the warmest temperature setting.
10. Place a thermometer into the center I/P PANEL air outlet and affix a second thermometer to the heater core outlet heater hose.
11. Record the temperature at the center I/P PANEL air outlet and at the heater core outlet heater hose. Are the two temperature readings about equal? If yes, go to the next step. If no, go to step 13.
12. Inspect and repair the cowl, cowl area, recirculation door, and the HVAC evaporator/heater core case for cold air leaks. Repair any problems found, go to step 17.
13. Inspect the temperature door operation. Repair any problems found, go to step 17.
14. Turn OFF the engine. Back-flush the heater core. Start the engine. Select the FLOOR mode and the lowest blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Is the inlet heater hose feel significantly hotter than the outlet heater hose? If yes, go to the next step. If no, go to step 17.
15. Replace the heater core. When the repair is completed, go to step 17.
16. Check for low engine temperature problems, Repair or replace as needed, go to step 17.
17. Operate the system in order to verify the repair. If the system operates properly, the repair is complete. If the heater still does not work properly, repeat the entire procedure.

Are the 2 tubes that go to the heater core getting hot? If so, then the blend door is not opening to allow heat to get to the cabin.

Possible vacuum motor problem, either disconnected, or the controller for the blend door is broken is likely problem.

Troubleshooting by Symptom Poor Heater System Performance CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.

1. Start the engine.
2. Idle the engine until the thermostat opens (upper radiator hose will be hot) Is the engine at normal operating temperature (approx. 200° F)? If yes, go to the next step. If no, go to step 16.
3. Set the mode selector to FLOOR mode.
4. Set the heater control selector to the warmest temperature setting.
5. Set the blower speed the lowest setting.
6. Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 14. If no, go to the next step.
7. Set the mode selector to PANEL mode.
8. Select the maximum blower speed.
9. Select the warmest temperature setting.
10. Place a thermometer into the center I/P PANEL air outlet and affix a second thermometer to the heater core outlet heater hose.
11. Record the temperature at the center I/P PANEL air outlet and at the heater core outlet heater hose. Are the two temperature readings about equal? If yes, go to the next step. If no, go to step 13.
12. Inspect and repair the cowl, cowl area, recirculation door, and the HVAC evaporator/heater core case for cold air leaks. Repair any problems found, go to step 17.
13. Inspect the temperature door operation. Repair any problems found, go to step 17.
14. Turn OFF the engine. Back-flush the heater core. Start the engine. Select the FLOOR mode and the lowest blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Is the inlet heater hose feel significantly hotter than the outlet heater hose? If yes, go to the next step. If no, go to step 17.
15. Replace the heater core. When the repair is completed, go to step 17.
16. Check for low engine temperature problems, Repair or replace as needed, go to step 17.
17. Operate the system in order to verify the repair. If the system operates properly, the repair is complete. If the heater still does not work properly, repeat the entire procedure.

Air Door Actuators/Motors Removal & Installation Recirculation Actuator To Remove:

1. Remove the right lower instrument panel (I/P) insulator.
2. Remove the glove box assembly. Recirculation actuator (Typical)
   
   
3. Remove the mounting screws and recirculation actuator from the HVAC module assembly.
4. Disconnect the recirculation actuator harness connector.

To Install:

1. Align the recirculation actuator slots with the flats on the actuator door shaft.
2. Install and secure the recirculation actuator on the HVAC module assembly with the mounting screws.
3. Connect the recirculation actuator harness connector.
4. Install the glove box assembly.
5. Install the right lower I/P insulator.
6. Calibrate the recirculation actuator.

Mode Actuator To Remove:

1. Remove the right lower instrument panel (I/P) insulator.
2. Remove the glove box assembly. Mode actuator
   
   
3. Remove the mounting screws and mode actuator from the HVAC module assembly.
4. Disconnect the mode actuator harness connector.

To Install:

1. Align the mode actuator slots with the flats on the actuator door shaft.
2. Install and secure the mode actuator on the HVAC module assembly with the mounting screws.
3. Connect the mode actuator harness connector.
4. Install the glove box assembly.
5. Install the right lower I/P insulator.
6. Calibrate the mode actuator.

Air Temperature Actuator Right Side To Remove:

1. Remove the right lower instrument panel (I/P) insulator.
2. Remove the glove box assembly. Air temperature actuator (right side)
   
   
3. Remove the mounting screws and right air temperature actuator from the HVAC module assembly.
4. Disconnect the right air temperature actuator harness connector.

To Install:

1. Align the right air temperature actuator slots with the flats on the actuator door shaft.
2. Install and secure the right air temperature actuator on the HVAC module assembly with the mounting screws.
3. Connect the right air temperature actuator harness connector.
4. Install the glove box assembly.
5. Install the right lower I/P insulator.
6. Calibrate the mode actuator.

Left Side To Remove:

1. Remove the left lower instrument panel (I/P) insulator. Air temperature actuator (left side)
   
   
2. Remove the mounting screws and left air temperature actuator from the HVAC module assembly.
3. Disconnect the left air temperature actuator harness connector.

To Install:

1. Align the left air temperature actuator slots with the flats on the actuator door shaft.
2. Install and secure the left air temperature actuator on the HVAC module assembly with the mounting screws.
3. Connect the left air temperature actuator harness connector.
4. Install the left lower I/P insulator.
5. Calibrate the mode actuator.

Hi jmach,

There is nothing wrong with your vehicle and no need to have anything repaired.... The high idle speed is controlled by the on board ECU...(the Electronic Control Unit).... When starting the vehicle from cold, the automatic enrichment of fuel increases the idle speed... Depending on the ambient air temperature.... the colder the weather, the longer the engine will take longer to return to normal idle speed. Thats how it's designed to operate.

Regards Johngee10