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        General >> Problems >> Climate Control always on
        
(Message started by: Huff on May 14^th, 2007, 9:34am)

Title: Climate Control always on
Post by Huff on May 14^th, 2007, 9:34am

Hello, although i've been reading this forum for a while, this is my first post...and is full of problems :'(

I have recently bought a '97 2.3 Ghia auto.
First problem is that the climate control stays on even when the blower switch is set to 0, it still displays the temperature settings and the fan is still blowing hot air (that's the second problem, although the AC compressor is working there is no cold air).
The HBC is destroyed and i left it disconnected (if anybody has a spare one...), naturally now the blower stays off but the CC still on, i will try with another HBC but i think that's not the only problem, i also tried another CC control panel (with the help of Octavian_P) and it's still the same.
Anyone had this problem before?

Regards.

Title: Re: Climate Control always on
Post by Snoopy on May 14^th, 2007, 12:03pm

To switch the CC OFF. BOTH dials need to be turned fully to the left otherwise it will still work.

Also does the manual switch NOT work? the one with the little green light in it.

If the position of the right hand knob is on the screen the AC is ON by default and will stay on... regardless because that is the default.

Title: Re: Climate Control always on
Post by Octavian_P on May 14^th, 2007, 12:42pm

Hi there.

Well i have introduced Huff already to the wonderful world of Scorpios.

With both dials on the left the blower fan still runs and the temp gauges still work. Normally when blower fan is on off position - - is displayed instead of temperature or lo / hi. The problem is that we can't switch it off or reset it. The AC light does turn on / off via button and activates / deactivates the compressor

Title: Re: Climate Control always on
Post by Huff on May 14^th, 2007, 1:12pm

As Octavian_P said, the thing just won't turn off. Also the recirculated air and AC buttons don't work when the car is standing, i have to drive a few meters and then both work. :-[

Title: Re: Climate Control always on
Post by Snoopy on May 14^th, 2007, 5:24pm

Sounds like a wiring/ Fuse box fault... Check the relays before going anywhere. May be a relay is stuck CLOSED... Others might have more knowledge.

Title: Re: Climate Control always on
Post by scorpio_man on May 14^th, 2007, 8:31pm

hi there

have you tried 'hard' resetting the unit by turning the dials as per the instructions for the reset then disconnecting the battery for a few minutes.

reconnect the battery and see if you can do the reset now.

hth

Title: Re: Climate Control always on
Post by Octavian_P on May 14^th, 2007, 8:40pm

We have disconnected the battery, no luck. We turned all dials to left-most position (ventilation off, air direction knob to the left most position) but the LCD's still show temperature instead of ( - - ) Because of this we can't reset the module.

Title: Re: Climate Control always on
Post by scorpio_man on May 14^th, 2007, 8:49pm

hi there

did you try and reset it? even though it's still on.

hth

Title: Re: Climate Control always on
Post by Huff on May 14^th, 2007, 8:53pm

I left the battery disconnected about 30 minutes, but i am not sure that the dials were in the correct position. No change after that, i will try again with the dials to the left. I will also verify all the relays.
It looks like i will need a new HBC and a receiver dryer (i found that some "mechanic" open it with a metal saw or something and then weld it back...don't know why...), i will put a post in the Parts Wanted section.
Thank you for the replyes

Title: Re: Climate Control always on
Post by Huff on May 14^th, 2007, 9:02pm

Yes, we tried to reset it but when i press both buttons with the dials to the left, nothing happens, in fact the recirculated air and the AC turns on or off, because the cc is still on..

Title: Re: Climate Control always on
Post by scorpio_man on May 14^th, 2007, 9:10pm

hi there

have you tried to get the knob off the fan dial? maybe, somehow, it's on the wrong part of the spindle?

or tried some switch cleaner in/on the pot?

hth

Title: Re: Climate Control always on
Post by Huff on May 14^th, 2007, 9:25pm

Yes i got the knob off and everything looks ok, i also tried another cc control panel and it made no difference.

Title: Re: Climate Control always on
Post by Huff on May 16^th, 2007, 8:56am

The CC still stays on, i will further investigate this problem.
The second problem is that although the AC compressor runs there is no cold air.
What other problem could be beside low refrigerant agent in the AC circuit?
The AC guy told me that there should be at least 500g of r134a in the AC circuit, would that be enough to at least feel the AC pipes to the evaporator colder?

Title: Re: Climate Control always on
Post by petehull on May 16^th, 2007, 3:25pm

500g is the old spec, the new quantity is 1000g(edited), if there isn't enough pressure there the high pressure switch on the top of the dryer will not be activated and the compressor should not operate.

hth
Pete

Title: Re: Climate Control always on
Post by big_neil on May 16^th, 2007, 4:30pm

i think you mean 1000g pete, the last time mine was checked it only had 500g in and it still ran perfect.

Title: Re: Climate Control always on
Post by petehull on May 16^th, 2007, 4:35pm

Yes thats right, I was stuttering and missed the 0 :D

Mine only had 500g too but it didn't work properly, the switch does two functions I believe... ???
Pete

Title: Re: Climate Control always on
Post by Snoopy on May 16^th, 2007, 4:51pm

Sorry Pete you are incorrect with the amounts. The original amount of refrigerant Ford used in the Scorpio was 740 g of R 134a +/- 10% which was then replaced by 1000 g +/- 20% . its all explained HERE (http://www.fordscorpio.co.uk/aircon.htm)

Title: Re: Climate Control always on
Post by Huff on May 16^th, 2007, 6:27pm

The compressor operates so i think there is enough refrigerant but no cold air.

Title: Re: Climate Control always on
Post by petehull on May 16^th, 2007, 9:37pm

I knew there was some figures somewhere but couldn't remember where,thanks snoop, isn't it right to think then that 500g would be below the original quantity and then therefore would affect the switch operation? I am trying to learn as much as possible about this system< I think it is more sophisticated then many people including garage technicians etc believe having seen the bewildered looks on the faces of garage staff who have completed basic courses....
Pete

Title: Re: Climate Control always on
Post by Snoopy on May 17^th, 2007, 9:00am

I would have thought it still worked albeit not very well. I do NOT know enough about the A/C to comment any further... I understand HOW it works ... latent heat etc but as the intricate workings NO . I have not got the time nor the inclination these days ... TOO old and busy! ;)

Title: Re: Climate Control always on
Post by Huff on May 18^th, 2007, 9:30am

I haven't found any relays that operates for the SATC module, do you know if there are any relays that controls the stop/start of the CC/SATC ?
I still can't turn it off, when i set the knobs to the leftmost position it still displays the temperature settings in place of -- ???

Title: Re: Climate Control always on
Post by Snoopy on May 18^th, 2007, 12:20pm

I would have thought if you are unable to turn the system OFF completely then the SATC Module would be at fault. There is a ribbon cable connecting that to the front panel and Me personally would be looking there first.

With regards relays is there one in the glove box for the A/C?See page 134 for further details. handbook (http://www.fordscorpio.co.uk/images/handbook134.gif)

Title: Re: Climate Control always on
Post by Huff on May 18^th, 2007, 1:30pm

The ribbon cable looks ok, i hope i can try another SATC unit and also look after the relays in the glove box.

Regards.

Title: Re: Climate Control always on
Post by Tompion on May 19^th, 2007, 1:06am

I posted this on the mailing list a few weeks ago:

Just had a look at an old control I have apart.
There is a fine adjustment screw next to the recirculation button, trouble is it's on the front of the board so you have to take the control apart to get at it.
I tried it on my car & was able to make the fan come on with the controls set to off by turning this.

With the ribbon disconnected the fan stays on so I guess just a bad connection could do this,
check all the pins very carefully.

Dave

Title: Re: Climate Control always on
Post by Huff on May 19^th, 2007, 10:19am

Hi
I fount that adjustment screw but all i could do was raise the fan speed. :'(
I hope i can try another SATC module soon.
Regards.