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Aircon steppers or condensor?
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ruggedpeak
 


Member Since: 10 Jun 2010
Location: UK
Posts: 1625

United Kingdom 2007 Discovery 3 TDV6 XS Auto Zermatt SilverDiscovery 3
Aircon steppers or condensor?

Getting cold air out of passenger side and tepid air on drivers. Put on full heat and get heat on driver's side and tepid air on passenger.

Was showing the usual stepper error codes, so cleared them. Then did the HEVAC reset (econ & recirc buttons) and got 8 error flashes and none from defrost LED. Ran system same symptoms but the error codes have yet to return!

Am I safe to assume it is dashboard dismantling time to replace the stepper motors?

Thanks. Thumbs Up Tony

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Post #20669928th Jul 2019 9:25 pm
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Oswiperus
D3 Decade 


Member Since: 02 Apr 2010
Location: Chelmsford, Essex
Posts: 1590

United Kingdom 2005 Discovery 3 TDV6 SE Auto Java BlackDiscovery 3

Starting to see a few on the forum now with a partially blocked heater matrix, the passenger side seems to silt up first and go cool. I think some have had success back flushing with a hose pipe from the bulkhead or I think changing the matrix isn't tragically difficult. Stepper motors are a Censored to change, I did all four some years ago when one failed. Stu

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Post #20670168th Jul 2019 10:30 pm
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jueylea
 


Member Since: 13 Apr 2019
Location: Adelaide
Posts: 6

Australia 2011 Discovery 4 3.0 SDV6 HSE Auto Barolo BlackDiscovery 4

Had the same issue with my d4. Flushed the heater matrix via the heater pipes alongside the motor, both directions. Injecting some air with the flushing water in pulses brought out a lot of crap. Where does the silt come from? Works like a treat now.
Was concerned initially that it may have been the stepper motors but confirmed the relevent were all working with a camera scope.  
Post #206789111th Jul 2019 10:44 pm
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ruggedpeak
 


Member Since: 10 Jun 2010
Location: UK
Posts: 1625

United Kingdom 2007 Discovery 3 TDV6 XS Auto Zermatt SilverDiscovery 3

Thanks Guys, will fire up the borescope and hope it is not the steppers! Thumbs Up Tony

Club RLD Wheel Protector & Sump Guard
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Post #206799012th Jul 2019 4:59 pm
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lynalldiscovery
 


Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274

United Kingdom 2006 Discovery 3 TDV6 Metropolis LE Auto Bonatti GreyDiscovery 3

jueylea wrote:
. Where does the silt come from?
.


Corrosion inhibitors in the coolant breaking down and the engine block starts rotting from the inside.  
Post #206799912th Jul 2019 6:35 pm
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