climate control dash pod temp reading -86

I am guessing I have forgot to hook up a sensor some where, just wandering if any body knows what causes this. I am guessing that I forgot to connect a sensor or plug some where.

Could not find any info on the -86 temp reading anywhere, and not so keen to pull everything out to go hunting quite yet

 

exterior temp. sensor in front bar

 

thanks man, I was thinking it was something inside, and was wracking my brain trying to think of what I missed.

 

i'm not entirely sure but I think it's screwed into the underside of the reo bar. that's a guess, because I just pulled mine off and I couldn't figure out what a certain little device there was 'til now

that said, my NA didn't have a reo for a while and I never got the -86.

 

Absolutely right, screwed to underside of reo bar

 

I am now thinking might have something to do with some of the AC gear that I removed from that spot, I might be able to find what exactly is the sensor, but quite sick at the moment(just come down with tonsillitis), so don't have the energy right now =]

 

You could be

looking right at it and not know what it was, bit bigger than a sugar cube, and roughly the same shape ( mine was hacked up so I'm not sure of it real shape) black in color, one wire coming out of it, with a black cover over the wire.

 

part found, there is 2 plugs on the cylinder, its connected to one of those plugs

will try it soon

 

Installed, and temp reads correctly now.

Fan also was only blowing at feet while reading incorrectly, and is now working as it should

 

Thats interesting.
So it seems the climate control ecu makes decisions factoring in outside air temp as well as inside air temp.
There you go!

l8r
E

 

I think it's just for the driver's reference sake, and what temperature they'll be enduring if they take the roof off!

 

colder air aims at the face, hotter air aims at the feet.

So if the outside temp is reads colder then what it actually is, then the air is sent to the wrong place.

when at -86 the climate control things that even with 10 degree temp on climate control that it is still heating the car up from -86, hence directed at your feet =]

I personally would not have cared too much, but could not get my heater to the right temp =p, only setting was time to melt your shoes and burn your feet off temp.




Thanks for all of those people who pointed me in the right direction, I always thought the temp monitors were inside the car =]

So god knows how long it would have taken me to figure it out, I'd probably be pulling my dash in a few days time

 

Yep, what HE said.
Thats was the line I was thinking along.
L8r
E

 

yep exactly how it should be, people who put the heaters on there face are crazy

nothing better then a mid winters drive with the heater full ball on your feet on a cold winters night with the windows down

 

Picture of the culprit

 

Ill whore this thread a bit here:
I just finished repairing my climate control.
The heater core had been eplaced and the complaint was that the heater would not turn off.
I found a couple of issues including some servos and temp sensors not connected at all and the overhead temp sensor fan not turning.
After much hard work, I managed to get the system running really well.

What i have noticed in the very cold mornings down here in Tassie is that, yes, the CC ecu will direct the warm air primarily to the footwells and mix in cooler air to the face vents BUT, this is when the preset cabin temp is being approached or has been reached.

In the initial warmup stage, the heat is directed to both the foot AND face vents AND also some air to the dash vents as well.
The ECU assumes that when really cold, defrosting is an issue and sends some hot air that way just in case.
As I mentioned, as preset cabin temp is approached, less and less warm air is mixed to the face vents and eventually, the face vents can get quite cold.
This is good in a way and keeps ur feet toasty and upper body cooler but i find cold air blowing on/around my face irritating after a while and i tend to aim the face vent louvres high to get around it.

This is not a peculiarity with the Zed CC. One of the trucks I used to drive had cabin climate control and did the same thing.
All, in all, the time and effort taken to get the CC working was well worth it. I set the CC at 21 degrees and it maintains that temp pretty damn well!

Newhoo, just what Ive found.

l8r
E

 

The A/C computer/AMP does use the ambient temperature as one of it's parameters to decide what to do with airflow and temperature.
I had the same issue in 2004 when I got a new front bar installed.
The panel shop threw the sensor away.

 

what a bunch of morons

That's specifically why I always keep everything I remove

 

Hi,
Sorry for bringing up an old thread. I also have a missing ambient temp sensor.

The diagnosis on the climate control (hold off+auto for 5sec) says the sensor reads -86 and is open circuited, that's fine seeing as nothing is connected. But then if i short circuit the two leads (white and red with black line) it still says its open circuit (vertical line in diagnosis next to -86).
Measuring the voltage between the two wires i get ~9-10V whereas page 138 here (http://www.300zx-twinturbo.com/cgi-bin/manual.cgi) says it should be 5.0V. If I read between the red and chassis i get 12V. Is something wrong? I have tried a 1K and 10K resistor as well to try emulate a thermistor, but i always get a reading of -86 and open circuit. My car is N/A too, so perhaps it should read 10V instead of 5V?

Thanks

 

Also, worth noting im getting this voltage even when the car is off & no keys in ignition.
Can someone please go outside with a multimeter and check if they reading a voltage when car is off? I'd be much indebted. I'm guessing my auto amp unit is faulty, but everything else is the diagnostics is fine :s