matty

iTrader: (54)

When I run the diagnosis for the Auto Climate control and with the car fully warmed up, sunny out, im getting a -26 flashing twice, then it goes to 20.

20 means everything is ok and -26 means the PBR is malfunctioning 'Potentio Balance Resistor' It doesnt flash the entire time. It ONLY flashed twice then goes to 20. What does that mean ? Maybe someone can run the diagnosis on theirs and see what you get.


I was told its inside the AIR mix motor, $60 from nissan.

Anyone have any experience with this at all ??

Kevlo911

iTrader: (36)

Last time I did it, I did not get that code. I would get 23 sometimes due to light.

Best bet might be to grab one off all these parts cars and see if it fixes it. Prob pick it up for 10

pmohr

iTrader: (26)

If the air mix door motor works, then the PBR itself is likely bad. If it doesn't work at all, then I'd say fuse, connector, or wiring.

PBR location:


Have you tested it yet?

matty

iTrader: (54)

Sometimes I dont get -26, sometimes it flashed up REALLY quick then goes to 20, and sometimes its flashes twice then goes to 20.

That connector is at the bottom of the heater unit ? thats in the dash behind the radio ?

-matt

pmohr

iTrader: (26)

Not quite up to my usual quality of images but eh, whatever. Photoshop FTL.

matty

iTrader: (54)

So I gotta take the dash apart to get to the connector to test correct ?

What puzzles me is that the -26 flashes once then goes to 20...and somtimes -26 doesnt even come up

-matt

jdooley

Matty, so are you having a problem with the system other than the diagnostics behaving strangely?

matty

iTrader: (54)

I have no idea what the problem is with it. Somtimes I get the 26 code and sometimes I dont.
It just seems to be really warm in the car. And if I turn the a/c off for a second, the inside of the car heats up really quick. Maybe that blend door is the culprit.

Guys with Auto Climate.
2 Questions
1) If you go outside at night, lets say its 60 degrees out, and you turn your a/c on, how cold is it coming out of the vents ?? I just went out, 57 degrees out, and turned it to 65, auto. Went to one fan speed and kinda cool air came out. Engine was JUST started. If I crank on all the fans on "manual mode" to high speed, it doesnt really change in temp. Shouldnt that be ICE ICE cold ???? If I go in my truck and turn the a/c on right now, it pumps FREEZING air

2) If its hot out, how fast does your fan speed kick down like your system is "catching up to itself"? If you got out on a hot day, and turn your a/c on, how longs it take to come up.

-matt

matty

iTrader: (54)

So that motor might work, but there is a senor on the door (PBR) that senses tempurature ? That could be bad ??

pmohr

iTrader: (26)

The PBR is integrated into the motor, but the PBR itself could potentially fail while the motor works just fine.

matty

iTrader: (54)

And the PBR is a sensor that has to do tempuratures ? So it thats bad, what is the downfall ?

pmohr

iTrader: (26)

Apparently, it's just based off of how far the air mix door is open.

As far as when it's bad... As far as I can tell, it's possible the air mix door motor won't switch the door between the heater core and the evaporator, but that's just a guess.

matty

iTrader: (54)

Well I ran it all the way home from work today, didnt get really cold the entire way. Stopped at my macanic to have him look at it, and the upper low side pipe is Freezing cold and dripping with water. The small line coming from the firewall is warm, but the air coming from the center vents, set to 65, manual all four fans, is blowing 49-52 degrees, and its only 67 degrees out. Something is definetly off, but I dont think it has to do with the compressor side of the system.

-matt

matty

iTrader: (54)

What do you guys think ?? anyone ever replace that motor and PBR with success ??

tdewitt34

what about your drier? I am having the same problem. I searched here and read alos told by a mechanic that could be the problem and it only costs around $20 to replace + the recharge and R143a(freon) of course. Also go to Nissanhelp.com and register there. You can download service manuals from there and save them. Great site and info

Bonka

iTrader: (13)

Ok I'm bumping this up since I'm having the same issue with my I30 and I've yet to get it resolved.

Diagnostic mode still pulls -26 after I've replaced the air mix door motor with a new OEM one, swapped the auto amp and the climate control panel.

It does indeed get COLD but as soon as the outside temperature warms up the A/C will not cool down. Highway driving generally will get it to how it should perform however.

I've had the system checked and the refrigerant level was fine and no leaks but I still had them evacuate the system and run a dye through it. The fact that it can get cold makes me think it's the expansion valve, which I've ordered and will have replaced including the drier.

What do you guys think? A harness short seems unlikely to me but I'm not too familiar with wiring.

I've also noticed that when it warrants A/C and I turn it on, the system will default to recirc without me turning it on, while the recirc button does nothing. Is this by design to cool the cabin quicker?