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by **hoolio** » Mon Jul 13, 2009 9:52 am

My 98 Caldina GT cabin heater has become possessed.
For example:
If I have the heater set at say 25C with the vent set to "feet" & "centre console"(out of the front vent above the stereo), I get warm 25C air out of the feet vent BUT cold air out of the front vents.
The same happens if I select the windscreen defrost & Feet. (Cold & Warm respectively).

I figured perhaps it was a heater door setting/fault however for the first 10 or so minutes of driving from a cold engine start up the vents that have been delivering cold air are warm like they should be.... later on they just start delivering stone cold air. WTF?

Thermostat perhaps? If so where does this darn thing live? Oh for the Caldina workshop manual - in Engrish.

Thanks for any help or advice in advance.

by **cat007** » Mon Jul 13, 2009 11:47 am

You don't have it on AUTO do you?

It tries to regulate the temp of the cabin making it 25C - so if it thinks the air up top is too hot, it'll pump out cold air to cool it down - and vice versa

Just a though?

by **fivebob** » Mon Jul 13, 2009 12:29 pm

I suspect that this is the way it's supposed to be. However you can check for error codes by doing the following;

With the ignition off simultaneously press AUTO & RECIRC/FRESH buttons.
Turn ignition on.

Code(s) will be display on the temp display. If there is more than one code then press "FRONT" to cycle through them.

Post any codes you get here and I will check what they mean.

by **hoolio** » Mon Jul 13, 2009 3:28 pm

Fivebob,

That was interesting.
After all the LCD digits and LEDs went out after pressing the Auto & Recirc buttons, it displayed the number 21,(flashing), it also indicated the font vent (with the arrow & little 'man' figure) on the display......

I then hit the recirc button (to try to make the system return to normal) however & it seemed to run off and do some kind of self test programme counting up and running through all the vent configurations while running the fan at various speeds...

by **brunch** » Mon Jul 13, 2009 3:38 pm

fivebob wrote:I suspect that this is the way it's supposed to be. However you can check for error codes by doing the following;

With the ignition off simultaneously press AUTO & RECIRC/FRESH buttons.
Turn ignition on.
Code(s) will be display on the temp display. If there is more than one code then press "FRONT" to cycle through them.

Post any codes you get here and I will check what they mean.

Hoolio sorry to hijack somewhat, but Fivebob is there any way to do something similar for a 97 Corolla BZ Touring wagon? Mine only blows full hot or full cold, nothing inbetween!

by **sergei** » Mon Jul 13, 2009 3:47 pm

brunch wrote:
fivebob wrote:I suspect that this is the way it's supposed to be. However you can check for error codes by doing the following;

With the ignition off simultaneously press AUTO & RECIRC/FRESH buttons.
Turn ignition on.
Code(s) will be display on the temp display. If there is more than one code then press "FRONT" to cycle through them.

Post any codes you get here and I will check what they mean.

Hoolio sorry to hijack somewhat, but Fivebob is there any way to do something similar for a 97 Corolla BZ Touring wagon? Mine only blows full hot or full cold, nothing inbetween!

Check if your cabin temperature sensor is hooked up, on AE101 it is behind the lower panel under the steering wheel (there is a little vent you will see).

by **fivebob** » Mon Jul 13, 2009 3:49 pm

brunch wrote:is there any way to do something similar for a 97 Corolla BZ Touring wagon? Mine only blows full hot or full cold, nothing inbetween!

Sorry I don't know anything about them, but I wouldn't think so unless it has the same sort of control unit with LCD readout.

If it has a slider for temp control, and seperate push buttons for the airflow control, then I can't see any way it would be able to output error codes.

by **brunch** » Mon Jul 13, 2009 3:51 pm

fivebob wrote:
brunch wrote:is there any way to do something similar for a 97 Corolla BZ Touring wagon? Mine only blows full hot or full cold, nothing inbetween!

Sorry I don't know anything about them, but I wouldn't think so unless it has the same sort of control unit with LCD readout.

If it has a slider for temp control, and seperate push buttons for the airflow control, then I can't see any way it would be able to output error codes.

No I thought so. Will check the cabin temp sensor tonight. Thanks

by **matt dunn** » Mon Jul 13, 2009 8:31 pm

brunch wrote: Will check the cabin temp sensor tonight. Thanks

Most faults we see with auto air con is the temp sensors,

there are two to control it, in cabin one under the dash as described,
and an external one probably in behind the grill,
( but in the rear bumper in subaru's..??..)

Check they are both there and connected.

by **fivebob** » Mon Jul 13, 2009 8:33 pm

hoolio wrote:Fivebob,

That was interesting.
After all the LCD digits and LEDs went out after pressing the Auto & Recirc buttons, it displayed the number 21,(flashing), it also indicated the font vent (with the arrow & little 'man' figure) on the display......

Error 21 is short circuit in sunlight sensor circuit continuously for more than 8.5 minutes, or a break in sunlight sensor circuit.

Possible causes are Faulty sensor or wiring between the sensor and the A/C amplifier or a faulty amplifier

I then hit the recirc button (to try to make the system return to normal) however & it seemed to run off and do some kind of self test programme counting up and running through all the vent configurations while running the fan at various speeds...

I'll have to translate a bit more of the manual to find out what that did. To set it back to normal you should press OFF.

by **fivebob** » Mon Jul 13, 2009 9:08 pm

OK it seems the info I originally gave you is how to check the sensors. Pressing RECIRC makes it go on to checking the fan and shutter drives. There is only one error code relating the the shutter drives which is Code 31. If you get that error it seems that it will stop at the point of failure and indicate which mode it failed on.

by **hoolio** » Mon Jul 13, 2009 9:57 pm

Thanks Fivebob. Are you having to translate that "Russian" Caldina manual?!?!

Impressive!

The only fault code I got was the 21.
I will set about trying to locate all these bits & pieces. Hopefully it's just a bad connection....

(If you do have any component diagrams that don't require translation efforts on your part, they'd be much appreciated.)

However thanks very much for the help to date!

by **fivebob** » Mon Jul 13, 2009 11:58 pm

All translated with the help of Cuneiform OCR and MSWord Translate function + some semi intelligent guessing on my part

1= Sunlight Sensor.
2= Cabin Temp sensor.
3= Control Panel.
4= Air intake shutter drive.
5= Airflow direction shutter drive.
6= Fan Control Unit
7= Airflow mixer shutter drive
8= Post evaporator Air Temp sensor
9= Fan Motor

I think the A/C amplifier maybe part of the control Unit.

To test the sunlight sensor;

Measure the voltage across the pins A5-B1 on the control panel connector.
In shadow no more than 0.8v
In Sunlight No less than 1.0v

by **matt dunn** » Tue Jul 14, 2009 1:05 am

Dont know how much you want to read in to it but,

of all the car auto air con system we have checked that are scan too compatable, 99% of them come up with sunlight sensor fault, unless you are outside in 100% direct sunshine, or shine a very bright torch into them.

Have never woried about fixing that particular fault as we done believe it is an actual fault.

But have not specifically worked on that model so take what you want from it.

by **fivebob** » Tue Jul 14, 2009 1:27 am

Just checked and it does put out an error when there is no sunlight. That said however when I checked my car this morning to see that I had the instructions right, I didn't get a sunlight sensor error and it was an overcast day.

Like I said before I'm not even sure this is a fault. In other Toyotas I have owned bi-level air flow resulted in hot air at floor level and cold air out of the top vents.

by **hoolio** » Tue Jul 14, 2009 9:26 am

Thanks very much for all the information - diagrams too!

When I ran the test yesterday the car was in a dimmly lit garage so I may try again today as the 'sun is actually out' today - most unusual of late!!

Website · by **Mr.Phreak** » Tue Jul 14, 2009 12:15 pm

The Soarer usually throws a sunlight sensor fault if I'm not in direct sunlight, have always ignored it

by **MAGN1T** » Tue Jul 14, 2009 2:32 pm

Yoy're wasting your time doing all that shyte unless you've reset it first to confirm that it's still not working properly.
Reset as in disconnect the battery.

Steve

by **fivebob** » Tue Jul 14, 2009 2:49 pm

MAGN1T wrote:Yoy're wasting your time doing all that shyte unless you've reset it first to confirm that it's still not working properly.
Reset as in disconnect the battery.

Really, and what is your source of this piece of misinformation???

There is no need to reset anything, resetting will accomplish nothing in this case as there is nothing to reset.

by **Mr Revhead** » Tue Jul 14, 2009 3:26 pm

fivebob wrote:Just checked and it does put out an error when there is no sunlight. That said however when I checked my car this morning to see that I had the instructions right, I didn't get a sunlight sensor error and it was an overcast day.

Like I said before I'm not even sure this is a fault. In other Toyotas I have owned bi-level air flow resulted in hot air at floor level and cold air out of the top vents.

so sounds like its taking readings from thermistor sensor on dash, and thermistor sensor inside/under dash and trying to match the two by sending different temp air out the relative vents?

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