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ever wondered what the small round plastic thing is at the far left side of the front windscreen demister is?

it's a sun load sensor for the climate control. when you hit econ instead of A/C it measures the direct sunlight and works hard when needed rather than just all the time.

Heater or A/C not working well?

Climate Control Diagnostics

if you turn your ignition on and then hold the off button on the climate control for 5 seconds you will enter diagnostic mode.

hit the temp increase button (red triangle) to test all sensors. if any sensor is giving wrong readings it will give you a code.

20 means nothing is wrong and 21 through to 27 will give you the sensor that is faulty.

keep in mind, you must have direct sunlight on the sun load sensor for it to diagnose properly (otherwise it assumes the sun load sensor is stuffed)

20 - all is normal

21 - outside air sensor

22 - Inside air sensor

23 - Water temperature sensor

24 - Intake temperature sensor

25 - Sunload sensor (small sensor on the left hand side of the dashboard near the windscreen)

26 - PBR

27 - Refrigerant temperature sensor

ever wanted the climate control to try harder to cool or heat?

to enter full cold mode, turn the temp down to 18 degrees then hold the cold button. (figured this out accidentally)

do the same for full heat but turn it up to 32 then hold the hot button.

ever wondered where the climate control takes the interior temp reading from?

just right of the ash tray there are little slots in the plastic. that's where.

whilst moving if you turn the ignition off and on you lose all wheel drive until you stop.(fairly well known but maybe you didn't know)

any more cool stuff, please let me know! i love finding these things out!

  • 1 month later...

Thanks for this. Very interesting. Bloody 1990 cars shoulda been make in 1997 or something lol.

Can this sort the problem of not being able to increase temp? Soemthimes I can only decrease temp and not increase (when I press the red arrow it does nothing).

Edited by TyresBro
  • 5 months later...

Thanks for this. Very interesting. Bloody 1990 cars shoulda been make in 1997 or something lol.

Can this sort the problem of not being able to increase temp? Soemthimes I can only decrease temp and not increase (when I press the red arrow it does nothing).

Just going through a few old replies I never read, this sounds more like a stuffed hot button on your climate control unit. I'd buy a second hand unit or take it to a small electronics store :) you often find one little old guy that owns it and will help with anything electronic. They'd be the two things I'd conceder anyway. Seen r32 climate control units on eBay for $200.

  • 4 months later...

Hey mate, I've got 2 climate controls, both work fine fast heat fast cold up down ect, my heater was stuck on and heater tap wasn't moving on FC so I changed it now it does, however it's still stuck on hot air when I change the heat up and down and the tap isn't moving, I think it's a sensor somewhere but neither of the units will go into diagnostic mode, any ideas anyone? Help will be appreciated cheers!

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