[928uk] Cabin Heater Conundrum

[Angus]

Mine is exactly the same

Angus
--
On 9 Jan 2004, at 5:26 pm, Walker, Scott wrote:

> Anyone who knows the ins & outs of our complex HVAC system... here is 
> a conundrum for you on my '91 car:
>
> With my temp control slider right over to right (max. temp), & 
> direction slider set to any position (recirc/centre 
> vents/up/down/screen demist) I get hot air delivered :-)
>
> With temp control set to anything below 28 (approx.), & direction 
> slider set to up/down/centre vents I get only cold air :-(
>
> With temp control set to a value below 28 (say in middle: 24), & 
> direction slider set to recirc (full left position), I get warm 
> [mixed] air delivered :-)
>
>
>
> These tests were done on a chilly day (6 degrees outside) with car 
> window open to lower cabin temp.
> I have had the exterior temp sender connector cleaned up (in 
> alternator cooling duct), & I have checked operation of hot water 
> valve (under airbox - I put a new unit in) - which only closes when 
> temp slider is at extreme left position (coldest). I have also checked 
> operation of the mix-flap servo (seen from drivers footwell looking up 
> under dashboard over transmission tunnel) which steps in unison with 
> adjustments to temp slider.
>
> So I'm confused - is my lack of warm (mixed) air [in anything other 
> than recirc mode] due to another flap blocking off my nice hot heater 
> matrix when it shouldn't be? And if so, why does the recirc setting 
> get it to open again?
>
> Any advice welcome!
>
> Scott '91 GT
>  
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