I have a 2007 Honda Accord 4dr and have noticed that my windows keep fogging up and when I try to turn the heat on it doesn't change the temperature at all, in fact turning the climate control **** doesnt do anything at all in terms of less cold, there is pretty much AC or just air. I added in some coolant but havent noticed any leaks under the car, what parts seem most likely to have broken and should be repaired?

 

What trim level is this? Does it have auto climate control or manual control?

I am thinking this may be due to a faulty mode control motor.

 

I believe it's an EX, it's a manual climate control, I also forgot to mention that it doesn't seem to overheat at all (gets about 4/5ths of the way to halfway on the temp gauge). I will look into the mode control motor.

 

Also as a note, fan speeds/fan modes work perfectly fine, AC turns on and off it seems as if just the climate control dial is the only thing that doesn't work

 

Run the self-diagnostics on the HVAC system. The first set of instructions are for auto-climate control (with navi and without):

1. Turn the ignition switch ON (II).
2. Press the AUTO button and then the OFF button. Continue to hold buttons down for 1 minute.

If there are any problems in the system, the temperature indicator will light up the segment (A through Q) corresponding to the error. The temperature indicator will then alternate every second between the displaying "88" (all segments lit) and the error code segment (A through Q).

NOTE: The system will only display the DTC when the AUTO and OFF buttons are pressed. If you release the buttons, the display will go blank. To return the display, simply press the AUTO then the OFF buttons again.







If the above instructions do not work for auto-climate control, then try these:
1. Turn the ignition switch ON (II).
2. Set the driver's temperature control dial or button on MAX Cool.
3. Press and hold the OFF button.
4. While holding the OFF button, press the rear window defogger button five times within 10 seconds. The self-diagnosis will begin.


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These next instructions are for manual HVAC:

1. Turn ignition switch OFF.
2. Turn fan switch OFF.
3. Set temperature control dial to Max Cool, then push the mode control button to select Vent.
4. Turn the ignition switch ON (II).
5. Press and hold down the recirculation control button.
6. While holding the button down, press the rear window defogger five times within 10 seconds. The recirculation indicator blinks two times, then the self diagnostic will begin.

If there is any problem in the system after self-diagnostic is finished, the recirculation indicator will blink Diagnostic Trouble Code (DTC) 1 through 6. If there are any problems in the evaporator temperature sensor circuit, the A/C indicator will blink DTC 7 or 8.

If no DTC's are found, the indicator will not blink.

 

Thinking about it some more, possible the air mix control motor may be faulty then. Run the self-diagnostic to see if there is a trouble code though.

 

No trouble code shows up, is there a way to check if it's the air mix control motor?

 

These procedures are to test the air mix control motor: