Please Help - 2002 Spyder - Heater not working...no hot air from vents

[giantoak]

Looking at the parts diagrams I don’t think there’s a control valve that cuts off coolant to the heater matrix. I think the air temp is controlled by flaps within the heater box that change air flow.

Two options for me either the flap is stuck or the heater air temp sensor is broken.

Thanks for everyone's help so far....

I think I have narrowed it down to one or both of these...the ambient air temp on the dash shows "E" when I turn the ignition on, but then when I start the engine it shows correct temperature. I have carried out the HVAC reset procedure by pressing the "recycle" and "Econ" buttons and turning on the ignition - Dash displays the codes "AA" "44" "84" - I have tried to searching for what these might mean but to no avail - perhaps someone on the Forum might be able to shed some light?

Definitely no blockage in the heather matrix and no obvious leaks...hot water is indeed circulating in the matrix all the time, regardless of heater settings as Oneball suggests. Have checked all fuses and tried disconnecting and jiggling the wiring to the heater box but that made no difference.

There is evidence of degraded foam suggesting that same will be true inside the box...it could be debris or corrosion that is causing the flap to stick...or it could be the actuator. Does anyone know where the flap/actuator is located and whether there any way to get to them without removing the dash?

 

[Zep]

Here is a link to the fault codes:

https://www.sportsmaserati.co.uk/index.php?threads/new-05-coupe.33984/post-874817

In terms of location, the actuator will be under the dash, on the side of the heater box.

 

[giantoak]

SUCCESS....actuator was on driver's side - I disconnected and reconnected it and hey presto...there is heat...

Thanks everybody...

 

[Oneball]

Excellent

 

[2b1ask1]

Well done indeed

 

[giantoak]

Thanks guys...where would we be without the internet and Forums like this when one needs a vital bit of info! Maserati ownership would surely prove to be somewhat more expensive...

 

[Zep]

SUCCESS....actuator was on driver's side - I disconnected and reconnected it and hey presto...there is heat...

Thanks everybody...

Love an easy fix, awesome!

 

[tomoshea]

Mine is blue (4200) from main Ferrari/ Maserati dealer..

 

[giantoak]

Alas..my delight at having cured the problem was short-lived - its now reverted to blowing cold again and no amount tweaking the connector restores heat. So its back to the error codes. I'm getting AA 44 84 55

44 = Type = "AC or DC": Description = "AC or DC towards battery +": Cause = "sensor": ID = "TA"
84 = Type = "AC or DC": Description = "AC or DC towards battery +": Cause = "feedback": ID = "mixing"
55 = Type = "Fault": Description = "Rotation"": Cause = "sensor": ID = "mixing"

Is anyone able to translate for me what the code 44 descriptors "AC or DC" and "TA" actually mean...

I suspect I'm going to need a new actuator...but not sure whether this can be replaced in-situ...I think I can just about get to the visible screws but then what happens to all the mechanics when I pull...and will I be able to fit the replacement without dismantling half the car?

Is there anyone out there who has tried this and can advise?...