Humps823
NAXJA Forum User
- Location
- Sharonville Ohio
I was hoping for some help with my 2000 Jeep Cherokee (XJ) heat and AC issues.
This past winter I noticed I didn't quite have the hottest heat when the days were cold enough to use it. I live in Cincinnati so we had some days in the 20's and even 10's where this was a big issue for me. I had the heat all the way hot and it was just barely warm, but when i turned it to cool, it would get cold and there were different temperatures in between, so the blend door was moving and stopping in the right places. I heard that the blend door broke sometimes and similar issues were experienced, but it got warmer outside and I let it slide.
Now its summer and I am HOT!. I can run the AC but its not quite cold enough. I finally got up the nerve to pull the stepper motor off today, and I feel a hard stop at both points. Also when I have it in the heat position, I get the hot air like I'm supposed to. More importantly, when I move it to cold I get ICE COLD AC. My conclusion regarding the blend door is that it is not broken.
I believe that my stepper motor is not moving all the way to its stop points. When I look at it with it still plugged in and vent or AC running, it doesn't move all the way to the stop points on the motor. Is there a way to reprogram the stop points manually so that the motor will actually have a wider swing? I know that this is the opposite of what is normally the issue, but I'm almost positive this is the fix, as I've already tested it by moving the door by hand while running the heat and AC (btw, had my AC system checked, I have a full charge with 38lbs suction. Both fans, mechanical and electric for the condenser and the radiator are functioning properly. My radiator and heater core have been flushed and filled with the correct amount of antifreeze. My temperature typically runs 190-195 and just above 200 in sitting traffic 90 degrees outside. I flushed the heater core myself and it flows just fine, with no leaks.)
In conclusion (lol) I really just want to know how to adjust the stepper motor limits so that I can get it to make the blend door to make a seal. I also understand that if I adjust the points too far I could then break the blend door--- in which case I'll have to send heatertreater both an email and money .
Any help you could supply would be just splendid, so i don't have to drive around with my finger on it... kidding...
If you can't help, I understand and I'll probably just copy and paste this to a jeep forum so I can get made fun of for writing too much... (I did.)
Thanks
Mike
This past winter I noticed I didn't quite have the hottest heat when the days were cold enough to use it. I live in Cincinnati so we had some days in the 20's and even 10's where this was a big issue for me. I had the heat all the way hot and it was just barely warm, but when i turned it to cool, it would get cold and there were different temperatures in between, so the blend door was moving and stopping in the right places. I heard that the blend door broke sometimes and similar issues were experienced, but it got warmer outside and I let it slide.
Now its summer and I am HOT!. I can run the AC but its not quite cold enough. I finally got up the nerve to pull the stepper motor off today, and I feel a hard stop at both points. Also when I have it in the heat position, I get the hot air like I'm supposed to. More importantly, when I move it to cold I get ICE COLD AC. My conclusion regarding the blend door is that it is not broken.
I believe that my stepper motor is not moving all the way to its stop points. When I look at it with it still plugged in and vent or AC running, it doesn't move all the way to the stop points on the motor. Is there a way to reprogram the stop points manually so that the motor will actually have a wider swing? I know that this is the opposite of what is normally the issue, but I'm almost positive this is the fix, as I've already tested it by moving the door by hand while running the heat and AC (btw, had my AC system checked, I have a full charge with 38lbs suction. Both fans, mechanical and electric for the condenser and the radiator are functioning properly. My radiator and heater core have been flushed and filled with the correct amount of antifreeze. My temperature typically runs 190-195 and just above 200 in sitting traffic 90 degrees outside. I flushed the heater core myself and it flows just fine, with no leaks.)
In conclusion (lol) I really just want to know how to adjust the stepper motor limits so that I can get it to make the blend door to make a seal. I also understand that if I adjust the points too far I could then break the blend door--- in which case I'll have to send heatertreater both an email and money .
Any help you could supply would be just splendid, so i don't have to drive around with my finger on it... kidding...
If you can't help, I understand and I'll probably just copy and paste this to a jeep forum so I can get made fun of for writing too much... (I did.)
Thanks
Mike