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Topic: Climate control problem (longterm) (Read 927 times) |
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Clive
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Climate control problem (longterm)
« on: Dec 22nd, 2004, 12:50pm » |
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The climate control works fine for 30 minutes then fades away leaving you hot in summer and cold in winter. The amount of air coming out of the vents drops to nothing but the fan is blasting away. I've got no error codes and I've done 20 resets all of which do what is expected. Any ideas please?
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Snoopy
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Re: Climate control problem (longterm)
« Reply #1 on: Dec 22nd, 2004, 2:04pm » |
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Have you checked the filters they can get blocked and prevent air flow but this does not seem to be your problem... If you open the face level vents do you get air flow?......
If the fan s running at full speed then one has to presume the HBC is working OK as the amount of air should decrease as the temeperature is reached as its fuly automatic....as for cold air remember that the A.C. only works in temperatures above +40C
I think we need more details before definite advice can be given.....
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Clive
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Re: Climate control problem (longterm)
« Reply #2 on: Dec 22nd, 2004, 3:27pm » |
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Thanks for your reply snoopy.
tried pollon filters out- same
tried new filters- same
tested then replaced HBC-readings were poor and thought the resistance might be changing as it warmed up.
Its as if a flap gradually closes after its been running obout 30 mins gradually shutting of the airflow then after about an hour its freeing and the windows start to steam up. When you start the car in the morning its OK ie when the engine starts to warm hot air blasts out then reduces again to nothing. Its the same manual or auto, the fan is doing what it should but no air is coming out. It does not matter what position the distibution switch is in there is no air coming out any of the vents including central (yes I have got it open) thanks
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Snoopy
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Re: Climate control problem (longterm)
« Reply #3 on: Dec 23rd, 2004, 7:12am » |
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Strange one this ..never come across this one........ others might but from the lack of response.. I don't think so.. It looks like you might have to bite the cbullet and take the dash off and see whats going on thats the only thing I can think of.. have a look at the diagrams on the main site and see if you can work where to go to fix it ... Sorry I cannot offer any other help.....but will keep thinking and looking ...
Just one thought it could well be a faulty sensor on the system that does it and that needs the dash iout as well..
http://www.fordscorpio.co.uk/aircon.htm
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laffrey
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Re: Climate control problem (longterm)
« Reply #4 on: Dec 29th, 2004, 5:47pm » |
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I can confirm that I have similar problems with my Scorpio. Many parts have been changed but still random issues: no air (hot or cold) inside vehicule despite fan blowing.
It happened during hot summer but also in rainy winter (last week). Outside temperature was below +4C. It was raining. No hot air, a lot of steam inside. I drove 800km in such conditions.
Next day (after the car had slept for a long night  ), everything was working OK !!!
Nobody can explain it...............
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Eric_R
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Re: Climate control problem (longterm)
« Reply #5 on: Dec 29th, 2004, 8:40pm » |
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Guys,
Have you checked the inside of the evaporator while it's shut off? I wonder if the evaporator is freezing up and shutting off the air flow. WHen you've stopped after a while the ice would melt and then drain away. It might be that you have a duff thermister that is sending a high reading to the module that is causing the icing up.
Next time it happens remove the pollen filters and have a look inside the evaporator with a torch - make sure it's not iced up. If it is try another run with the compressor unplugged so it doesn't run. You should keep the hot air all the time then because the evaporator isn't iced.
Can you detect the compressor cylcing (ie, coming on and going off)? Perhaps the de-ice switch is faulty and not turning the compressor off when it should - this could cause freezing up, too.
HTH
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laffrey
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Re: Climate control problem (longterm)
« Reply #6 on: Dec 30th, 2004, 3:37pm » |
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Eric, thanks for your post.
I had thought about something freezing up. But, it also happens if A/C is turned off (and air distribution not on windshield only position)
So far, several parts have been changed: compressor, dryer, high pressure pipe, expansion valve
Today, I just checked the fault codes and I had values .... 50 and 57 that are not in the list
I have cleared the errors and reset the module.
Will see how it behaves after resetting.
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Clive
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Re: Climate control problem (longterm)
« Reply #7 on: Jan 1st, 2005, 9:43am » |
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Iaffrey, nice to see someone has the same problem. I had code 57 to. I think you will find it is the code for defective HBC, I checked mine and it proved to be faulty, unfortunately changing it didn't cure the problem.
Happy new year!
I'm going on holiday now, sadly the climate control is coming with me.
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Mrs Phuturephantasy
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Re: Climate control problem (longterm)
« Reply #8 on: Jan 1st, 2005, 10:00am » |
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Happy new year
are u going on hoilday ?
hope u and family enjoy holilday 
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Clive
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Re: Climate control problem (longterm)
« Reply #9 on: Jan 29th, 2005, 3:22pm » |
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Sorted. Thanks to Eric for his comments- the problem was a defective thermister.
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Eric_R
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Re: Climate control problem (longterm)
« Reply #10 on: Jan 30th, 2005, 12:15am » |
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Excellent, m8 - glad you're sorted. 
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tuv0k
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Re: Climate control problem (longterm)
« Reply #11 on: Feb 1st, 2005, 8:00am » |
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I have the same problem like Clive. only when A/C on.. so i think it will also be the thermister.. but on my display also appears the 57...I will check this
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Snoopy
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Re: Climate control problem (longterm)
« Reply #12 on: Feb 1st, 2005, 3:19pm » |
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Code '57' refers to a faulty HBC control there is a way of checking that ... well worth going down that route before changing the thermistor
http://www.fordscorpio.co.uk/hbctest.htm doesnt cost anything and is quite easy to do.
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tuv0k
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Re: Climate control problem (longterm)
« Reply #13 on: Feb 3rd, 2005, 5:13am » |
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Hmmm, i will do this, but it cant be the HBC modul, because the modul works fine...the error 57 only apppears, when the vents drops to nothing.. and it is difficult to test the HBC, when it happens. (after ca. 20-30 minutes of driving). The HBC is only responsible for the speed of the fan(s)?! So it doesn't control the vents... or I am wrong?!
(by the way, I have a '98 Facelift^^)
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Snoopy
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Re: Climate control problem (longterm)
« Reply #14 on: Feb 3rd, 2005, 7:46am » |
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Interesting one.. Well if the HBC isn't broken and tests OK then try a new thermistor.. It is not reported in the faults as being that (Code 57) but we might ALL learn something from this... I will for certain... Keep us posted PLEASE.
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laffrey
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Re: Climate control problem (longterm)
« Reply #15 on: Jun 21st, 2005, 8:03pm » |
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back to Eric's suggestion
after a long journey of 800 km under the sun in south of france, I opened the boot, removed the filters and found a fully iced evaporator. the filters were solid as well. and the expansion valve was white.
so I guess this is a sensor that's faulty.
any idea which one?
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