idiot's guide to air conditioning - Page 2 - Air-Con / Heating (Mk1/Mk2 Mondeo) - TalkFord.com

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idiot's guide to air conditioning


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#11

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Posted 13 July 2005 - 10:05 PM

wots air con

#12 Rhys

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Posted 13 July 2005 - 10:07 PM

Where can I get cold air to top up my air-con? :?
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Posted 14 July 2005 - 08:11 AM

Hi there,
Good info.
Just one observation on the green light, if the air-com isn't working the light won't either. Some time ago I lost my gas due to a punctured radiator :F (Garage said it was stone damage?? Well, its right at the front, not much protection) The light didn't come on, neither did the compressor clutch operate.

Cheers. :L

#14 neiluk1

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Posted 16 July 2005 - 04:40 PM

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The people at http://www.aircondit...gforcars.co.uk/ have prepared a FAQ too, which complements Simon's notes well.

Incidentally, what is the low temperature cut-off point for A/C, anyone? Someone mentioned 5C whereas I had thought it was closer to 15C. Any ideas?

Another thought - anyone care to prepare a FAQ that covers all the whims/problems/head-scratching issues that can arise with aircons, together with their causes/how to avoid or fix etc? Just throwing down the gauntlet as it'd be handy to have! ;-)


My aircon is increasingly struggling to come on... for a while it's been coming on for as long as required at first but after turning off it's sometimes been refusing to come back on again. Now, though, it sometimes seems to turn off even during that first operation after a while. Is that likely to be a low-gas issue emerging? If I get it regassed, would that automatically address any possible moisture contamination issues (i.e. by completely evacuating and regassing)?

This forum is a god-send :-P
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#15 Escortcab

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Posted 16 July 2005 - 06:33 PM

Iv'e been told it's nearer to 5oC also, just for another idiot. how much is a 'normal' regass?
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#16 BigAls

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Posted 16 July 2005 - 09:17 PM

Great explanation.
With regard to low temperature operation the Ford handbook does not seem to mention it. My old Zafira's instructions stated 4ºC as the cut off point.
The Ford handbook also reccommends that the unit is run for something like 20 minutes a week even during the winter, to make sure the system remains active.
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Posted 16 July 2005 - 09:41 PM

Hi there,
Good info.
Just one observation on the green light, if the air-com isn't working the light won't either. Some time ago I lost my gas due to a punctured radiator :F (Garage said it was stone damage?? Well, its right at the front, not much protection) The light didn't come on, neither did the compressor clutch operate.

Cheers. :L


Errrrr....not so in my case. Light is on. Air con is doing diddly. While looking for inspiration on here I have noticed others say the same. Light is on but no air con.


#18 compuwiz_uk

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Posted 16 July 2005 - 10:40 PM

Hi there,
Good info.
Just one observation on the green light, if the air-com isn't working the light won't either. Some time ago I lost my gas due to a punctured radiator :F (Garage said it was stone damage?? Well, its right at the front, not much protection) The light didn't come on, neither did the compressor clutch operate.

Cheers. :L


Errrrr....not so in my case. Light is on. Air con is doing diddly. While looking for inspiration on here I have noticed others say the same. Light is on but no air con.


It could all depend on what error the system finds which makes it not switch on the light or what model car its in. my aircon has no gas in ( all escaped when a pipe burst ) but the orange light on the button comes on but the compressor wont engage because of the lack of gas.

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Posted 16 July 2005 - 10:41 PM

Basic operation

So you want to switch on the AC? When you push the button it sends a signal to the Powertrain Control Module (PCM) which in turn engages the AC compressor clutch.


According to the wiring diagram for a Mk2 somebody kindly sent me this is not the case. The diagram shows no connection from the A/C switch to the PCM.
It shows a live feed from the blower motor through the A/C switch to the A/C compressor cycling switch then on to the dual pressure switch then the A/C WOT relay and finally to the A/C clutch solenoid. All good old fashioned switches. No digital black magic. The WOT relay is under the control of the PCM, when powered on it cuts the power to the clutch presumably when you have your foot to the floor.

It also shows there is a circuit through the heater mode switch in parallel with the A/C switch. When the heater is in either of two defrost positions power is supplied to the clutch via the A/C cycling switch, dual pressure switch and WOT relay as with the A/C switch.

The PCM does have a connection to the dual pressure switch and it seems it uses this to switch the engine cooling fans on when the pressure in the system goes high.

I have to say this diagram doesn't seem entirely right. It shows the dual pressure switch having four connections. As far as I can see on my car there are only 2. The Haynes manual only shows two but then it doesn't show any of the rest of the A/C wiring. Ho hum....


#20

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Posted 16 July 2005 - 11:08 PM

Hi there,
Good info.
Just one observation on the green light, if the air-com isn't working the light won't either. Some time ago I lost my gas due to a punctured radiator :F (Garage said it was stone damage?? Well, its right at the front, not much protection) The light didn't come on, neither did the compressor clutch operate.

Cheers. :L


Errrrr....not so in my case. Light is on. Air con is doing diddly. While looking for inspiration on here I have noticed others say the same. Light is on but no air con.


It could all depend on what error the system finds which makes it not switch on the light or what model car its in. my aircon has no gas in ( all escaped when a pipe burst ) but the orange light on the button comes on but the compressor wont engage because of the lack of gas.


According to this diagram I have the only thing that would stop the LED lighting is a lack of power to the blower motor. If power is getting there and so is getting to the A/C switch the LED WILL light when you switch on the A/C switch.






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