auto climate control

[[email protected]]

Hi im after ideas about my auto air con panel .... The problem is when i switch it on to AUTO and set the temperature down to its lowest 18 degrees my aircon is cold and the fan is on full ..... but when i put it to 18.5 it switches the fan right down to one bar.... im sure my old bongo used to change slowly hence i would expect the fan to remain on nearly full to cool the vehicle ....Im guessing the front cab temperature sensor is either faulty as it works ok in manual .....??? any ideas folks. ??? thanks alot Jason.

[dave_aber]

mine did that for a while. Have you been furkling around in behind the panel? One of the connectors at the back of the control panel was half out.

(p.s. - Wrong forum section, possibly? )

[g8dhe]

Yes on the Lowest and Highest settings, the Air Con. will turn the fan on full and cool/heat to the maximum effect possible, when you move the Temp. up/down 1/2 a degree then it goes back to Auto mode and drops the fan to what it needs given the temperature - we use the 18º to get a quick change of air when we get back to the vehicle on a hot day, or even if we have just been sat in it with the Sun blazing on us (but not the temperature sensor!).

BY the way you might get better replies if it was moved to the Tech section rather than "Was it you?"

[missfixit70]

All depends on the ambient temperature if tis working right, if it's blazing hot outside & 30 odd degrees, then when it's set at 18.5 the fans'll be on more to cool it down to that, than if it's 20 degrees outside temp & it doesn't have to do much/anything to get it it down to the required temp.
In theory the sunlight levels have an effect too as there is a light sensor jobby on the front of the dash as part of the sensing magic.

[[email protected]]

thanks for your replies i will try and remove the panel and look ive not been in there but the bongo seller might have been ...im still trying to work out what section im in ..... ???

[missfixit70]

It's in Techie now, where it should be , one of the mods will have moved it.
I don't think you have a problem personally, I think it sounds like it's pretty much doing what it should, may be worth checking the sensor behind the little grille is clear & working as well as the round sunlight sensor on the front of the dash on the drivers side.

[[email protected]]

Im still thinking my auto climate control is not functioning correctly can anyone else check theirs when my aircon is set on 18 ie the bottom, its blowing full as soon as you press it to 18.5 it drops right down to one bar ie hardly blowing surely it should barely move . i remember my last one moved gradually and didnt jump massively like this one is doing....also where the air is blowing changes automatically from feet to front vents is this normal ?

[g8dhe]

Yes that is the correct operation. The exact level of blowers and vents will vary as its under automatic control you just set the approx. temperature.

The 18° setting is the end of the range and it simply turns on maximum cooling with maximum fan. Likewise at the top of the range 32° it turns on maximum heating and again (pretty certain) maximum fans to get the heat circulating, at both extremes there is NO control of the temperature as such it just simply turns it on full blast!

Here you go the page from the manual;

[[email protected]]

Thanks Geoff i appreciate what your saying but i dont remember it working like it is now. My previous bongo had the same system and by turning it up half a degree from 18 degrees to 18.5 it turned the fan down only by a small amount.....this system is turning it right down to one bar despite what temp the interior is ..... surely it should change slightly as you increase or decrease the temp.....?......its very hard to describe online what its doing

[dave_aber]

That's still exactly like mine was all last summer, when I found one connector half out on the aircon control unit.

Another possibility is that the temp sensor may have given up. It sits behind the wee grille to the right of the glovebox.

[g8dhe]

I can't say that ours is any different from what you describe for most normal temperature settings. Its only when its very hot inside and the temp is set low, or very cool and the temp is set high, that the fan speed gets much above the middle settings. Have you tried manually turning the Fan settings thru the whole range ? That would prove that it can control the speed OK, that then only leaves, is it sensing the right temperature as Dave suggests above.

[dave_aber]

When mine was doing this, IIRC it wouldn't drive the fan manually other than flat out or what seemed like not at all. I checked out the transistor pack first - I may have even replaced it - to no avail.

[g8dhe]

I've just been out and checked ours;
Outside temperature is 14°C - Can't do much to change that!
Hit the Automatic button - set temp to 18°C Fans come on full blast 10 bars (I think there are ten bars a bit close to count!),
Set temp to 18.5°C fans drop to minimum setting just 1 bar showing,
Setting temperature higher it reaches about 5 bars at around 25-28°C and 7 bars at 32°C.
Other than at 18°C it never reaches all bars unless I drop it to manual and set the Fans to the highest setting.

[dave_aber]

Mine was similar, but it was hotter outside!

Ambient - about 28°

Set 18° - Fans run flat out, all the bars shown etc.
Set 18.5° - Fans drop to 1 bar showing, hardly any puff from the system.
Set 31.5° - Fans still 1 bar (and were at any other temp)
Set 32° - fans flat out, 10 bars, etc.

Once I'd reconnected the offending plug properly -

Set 18° - Fans run flat out, all the bars shown etc.
Set 18.5° - Fans drop to 6 bars or so, still quite a flow of air.
Set to 22° - fans slow a bit, 4 bars
Set to 28° - fans drop right down to 1 bar.
Set 31.5° - Fans increase to 2 bars
Set 32° - fans flat out, 10 bars, etc.

[[email protected]]

Thanks folks i will try it tomorrow and see if mine performs the same ish ..... it does work ok on manual its just the automatic setting it seems to act strange on , only i need to sort it before my warranty period runs out thanks for all your help...