my12by60 wrote:Page 15 of the HA section of the FSM shows a diagram of the heating unit and cooling unit. The diagram says "it is necessary to remove instrument panel" to access either the heating unit or cooling unit. You must have found a way around that. With the method you used, would you be able to access the bilevel door motor or the blend door motor? My heat does not work and the diagnostic says the problem is with the bilevel door motor and blend door motor. I have not tried to find the parts because I figured the replacement work would be too much for me.
No offense to anyone here, but if you try this method you are a fool. And who was the fool that tried it on my 79k 1999 Q45t? Me. I tried removing the evaporator box and it essentially crumbled and the heatercore is visible but I see no humanly way possible that it can come out without removing the dashboard like the FSM says.Claycoboi wrote: ↑Thu Dec 22, 2016 3:43 pmmy12by60 wrote:Page 15 of the HA section of the FSM shows a diagram of the heating unit and cooling unit. The diagram says "it is necessary to remove instrument panel" to access either the heating unit or cooling unit. You must have found a way around that. With the method you used, would you be able to access the bilevel door motor or the blend door motor? My heat does not work and the diagnostic says the problem is with the bilevel door motor and blend door motor. I have not tried to find the parts because I figured the replacement work would be too much for me.
Unfortunately no. The way I did it was I dropped the glove box then removed the evaporator box. Once you do that you can see the side of the heater core and you can get to the tubes. Then you remove the screws from the heater core, twist then then pull them out. Then slide the heater core out. The tricky part is putting the spring back on the the open and close valve on the top tube.
I'll let you know if I decide to go through with this repair, it's just that I'm ultra short on time and have way too many projects to take this on. Sux because this car is such low mileage and is a beauty...oy
I have to say though the positions I had to get in were...creative lol.
Lol no, don't! I would first check near the drivers sideSapofeo wrote: ↑Tue Sep 21, 2021 10:20 amI'm going to resurrect this thread yet again. I'm now facing the same issue. AC works great. Won't heat. I hear it trying to work but no joy. I'm seeing codes 25 (sunload sensor) and 27 (bi-level door) when I run the diagnostics. My question is... I don't mind taking apart the dash to a certain degree. I do NOT want to tinker with the air bag. Do you think I could get down to the heater core by taking apart the center console and possibly removing the radio and AC controls? I want to verify what's broken before I start ordering parts.
Well, I removed the center console and radio (I had done this once already to install the bluetooth adapter to the radio). Took like 10 minutes. Learned quickly it was a dead end. hahah. As far as the scanning goes, I used the built-in diagnostic described on HA-29 in the FSM. It spit out the two codes I listed above. I completely agree with not risking the AC. I have the luxury of having another vehicle with a working heater for cold weather transportation. I'll see if I can access the motor door by the gas pedal. I really appreciate the information, thank you.98_Q45 wrote: ↑Tue Sep 28, 2021 9:29 amLol no, don't! I would first check near the drivers sideSapofeo wrote: ↑Tue Sep 21, 2021 10:20 amI'm going to resurrect this thread yet again. I'm now facing the same issue. AC works great. Won't heat. I hear it trying to work but no joy. I'm seeing codes 25 (sunload sensor) and 27 (bi-level door) when I run the diagnostics. My question is... I don't mind taking apart the dash to a certain degree. I do NOT want to tinker with the air bag. Do you think I could get down to the heater core by taking apart the center console and possibly removing the radio and AC controls? I want to verify what's broken before I start ordering parts.
Where the pedal is: this was my first issue of heat not working originally. There's a motor there that controls the door for the a/c and heater core. Especially since you're getting a code for bi-level part. (Btw what scanner you're using that's able to read that?).
The motor you need is a dealer only part, you may need: Infiniti 27732-70F00 Air Mix Actuator Assembly.
If it is your heater core, you can't get thru via the radio controls area. Don't even waste time. The easiest way is to drop glove box as if changing cabin air filter, remove evaporator box (has to be done partially from the 2 connecting lines at the firewall). Then you just reach up and unscrew the plastic lines from the heater core.
But for the sake of preserving your air conditioning, I just wouldn't do it yet. Have to change the o rings and the drier, and pay for an evac/recharge. Took 5 months after replacement to get it working right again because of either not changing the drier or someone overcharging it. Never want to do that s*** again.
Also: my heater core never stopped "working" or getting hot, I had to replace mine because the plastic tubing was leaking down under the passenger side carpet. All the while, it still has heat.
Hmm...Idk. Tbh I still think your air mix motor isn't working correctly. You say "appears" to be working well but...is it really? You may even try unhooking the arms and moving it manually to see. It doesn't just "move", but when properly working, that little motor really does a full dance lol. If it's just moving halfway, you may need to clean the arms up. I had that same issue when I first brought mine. There was so much gunk and dirt there, the motor wore out. I even unplugged it and replugged it and it miraculously worked for a day, and then went back stuck in cold mode.Sapofeo wrote: ↑Tue Oct 19, 2021 7:43 amI'm always working on multiple home/auto repair projects so timing really isn't an issue. I've been driving around with the glove box removed for like a week. I come back to it when time permits. There is indeed another motor by the passenger airbag. that's the "intake door motor" for when you hit the recycle air button. It works just fine. The motor by the footwell I believe is the "air mix door motor", which appears to be moving well as well. The one that's invisible is the "bi-level door motor" which appears to be the one that requires removing the entire dashboard.