New 05 coupe
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spkennyuk
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If its an aircon fault then any decent aircon specialist will be able to fault find on it however before you go down that route there is an aircon reset procedure which also runs a diagnostic. This will check the system for you and if it finds a fault it will show a four digit alfa numeric code on the lcd that shows which gear you are in. The very bottom line that show the outside temperature will display the code.
Reset procedure is here
At the point when you push and hold the eco and recirc buttons is when the codes will display. You may get more than one code.
Post your codes up when you have them and i will find my code list.
I tried pressing both buttons, all I got was aa. Will try again tmro
spkennyuk
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Your probably seeing AA00 which is no fault.
Link below is the list of error codes.
Can you help? Please!
www.maserati-alfieri.co.uk
I think there is a copy of the list in the 4200 manual as well.
CatmanV2
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Yes it is AA00, so now im back to the problem of switch stuck on low. Nwe sw
Thank you! Code was AA00, must be the fan switch or maybe regulator?Fan switch clicks when you turn it, but does not change speed.It does blow cold air
Turning temp up & down does not affect fan speed in auto mode. Fan speed does not change
spkennyuk
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If you knock it off auto and manually increase the fan speed and put it on screen demist or upper vents is the fan speeding up ?
No, no matter what setting, fan speed stays on low
spkennyuk
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Zeps the resident air con specialist. However from what your describing the aircon does work but only on low speed.
Which leads me to think that it could be a relay fault or the fan switch.
Assuming its the same as alfa systems which i have trouble shooted before there are two relays. 1 for the low speed fan and one for the high speed.
Low speed seems to be working so if you make a short jump wire with a spade end connector on each end. Pull the relay for high speed fan 2 and then bridge the connection on the relay socket. If the high speed fan then comes on its the relay. If it doesnt it points to either the fan switch or another issue.
There are also low and high pressure sensors. If the aircon is definately chilling then the low pressure sensor is working.
In theory from my understanding the high pressure switch could cut in and restrict the system from blowing full speed.
@Zep can you debunk or confirm the last point.
CatmanV2
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Surely the fan has more than one speed setting? To me it sounds like whatever controls the speed is punk (which is not to say you're wrong, just that I can't see how two relays can provide >3 speeds.
We are, I assume, talking about the interior blower, not the fan in the engine bay.....
C
Where is the relay on this car?
spkennyuk
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Air con is variable speed achieved by 2 fans 1st relay is low speed 2nd relay kicks in 2nd fan at low and then high speed.
The relays are near the expansion tank.
Have a look at page 150 of the manual of later manuals. Its page 163 i think in earlier manuals.
You also have a fuse for each fan on the bulk head left hand side fuses 3 and 4.
CatmanV2
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I haven't got a manual, but just to be really really clear:
Are we talking about item 7?
www.eurospares.co.uk
Cos I'm really sure that every car I had had more than 3 speeds and only one fan......
The OP may have been talking about something different
C
Are we talking about item 7?
Eurospares Login | New & Used Genuine Parts
Login to your Eurospares account. View previous orders, saved baskets, proformas and more. Eurospares the leading prestige new and used car parts supplier.
www.eurospares.co.uk
Cos I'm really sure that every car I had had more than 3 speeds and only one fan......
The OP may have been talking about something different
C
spkennyuk
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I haven't got a manual, but just to be really really clear:
Are we talking about item 7?
Eurospares Login | New & Used Genuine Parts
Login to your Eurospares account. View previous orders, saved baskets, proformas and more. Eurospares the leading prestige new and used car parts supplier.
Cos I'm really sure that every car I had had more than 3 speeds and only one fan......
The OP may have been talking about something different
C
Its variable speed. Single fan but controlled by fan 1 and fan 2 circuit.
Cooling fan 2 is the high speed side of the circuit.
Cooling fan 2 circuit has its own fuse and a relay. If the fuse is ok and you bridge / jump the relay for cooling fan 2 circuit and it works then the relay is at fault.
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spkennyuk
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I haven't got a manual, but just to be really really clear:
Are we talking about item 7?
Eurospares Login | New & Used Genuine Parts
Login to your Eurospares account. View previous orders, saved baskets, proformas and more. Eurospares the leading prestige new and used car parts supplier.
Cos I'm really sure that every car I had had more than 3 speeds and only one fan......
The OP may have been talking about something different
C
Every 4200 has four fans. One for the air con. Two for the radiator and the one driving the car /owner.