Climate control

Hi and thank you for replying. When the unit is running, I am able to adjust the speed of the blower and it responds as it should. I am old enough to remember older A/C units working sporadically as the compressor would build up pressure or cycle the coolant, when the charge was low. This problem reminds me of that, but as I understand, this system does not work in that way. Regarding the connections, are you referring to connections in the dash? Or under the hood?

I cannot say it is the blower motor for certain. I have not been able to isolate it as the problem. When I turn the system 'on', (A/C or heat) it may start right away, but usually it will take several minutes or miles before the blower turns on. When it does work, it responds to speed adjustment (Hi-Lo). It may run for a few minutes to several miles, but will shut down and restart without reaching the set temperature. I hope I am not being confusing here. The blower motor works without any bearing noise, it seems smooth. It seems like whatever tells it to run and keep running, is not working correctly. However, I have to be open minded to include the blower motor, just because at this point, anything could be possible. My first inclination was to suspect the temperature sending unit under the dash, it seems to be clean and unobstructed. Someone in another forum suggested a "relay switch' on the firewall? To tap on it to see if it would allow the motor to start. I have not made that check yet. I only recently found this site and wanted to ask someone knowledgeable about it rather than another shade tree mechanic like myself.

Okay. Thank you.

Thanks for responding about this issue. You are correct in understanding the working response of the CC system. I have not checked the fuse, but certainly can and will. I have not been able to associate the working or shutting of of the system with any particular 'bump' or other event, that would jar the car and effect a loose or corroded connection.
When I turn the system on, it is random if it will start or not immediately. But when it does start, the control panel lights up as expected. Displaying current set temperature and outside temperature plus the fan speed can be controlled as well as the temperature control, up or down. Everything seems to work well. I may continue to run for a few minutes or for miles down the road whether heating or cooling the interior. One thing that has seemed to effect the length of running time, is having the sunroof open, in the 'wedge' position. It seems screwy to me, but I imagine that it is creating a draw from the interior of the car and not letting the temperature sensor get a constant or consistent read. That 'coincidence' first led me to think that the temperature sensor was not working properly. Maybe even plugged with dust or dog hair (my German shepherd), but when I check its entry point, it is clear.
I do not notice any difference in operation if the vehicle has been sitting any length of time. It often sits for a week or two without driving it, but does not seem to make a notable difference. Outside temperature, cold or hot, does not seem to effect it either. It still responds the same in either condition. I have set the controls to full hot and full cold without changing how it runs at all. I have changed to both 'extremes' and left it there for a few miles and it does the same thing. The fan blowing for a period of time and then stopping. Then repeat, repeat, repeat. It never runs long enough to reach the set temperature, no matter what it is set at. I do understand the difficulty in troubleshooting this problem remotely, but any ideas are greatly appreciated. I am pretty good with most things mechanical, so I am unafraid to tackle a problem. I just have not found the right direction to go on this issue yet. I do not have a bidirectional scanner. I have had the OBDII scanned, but it does not show any issues. Maybe the CC would not be included with that scan is my guess.

The lights stay lit, whether the unit is blowing or not. I did not mean to say otherwise. I will check the fuses and connections very closely to see if anything can be found. Thanks for the diagrams.

Thank you Steve. I appreciate your assistance and advice. I will try to find someone who is able to scan it for me and let you know what I find out.