[MSCW list] Little heat when set on 'face'

[Bryan Blackwell]

I don't know the specifics of how Mazda set this up, but I can think of a few possibilities:

 - The seals in the HVAC air mixer box are shot.
 - If the actuation is controlled by cables, the cables or end are worn and need replacement or adjustment.
 - If the actuation is by vacuum, there is a leak in the hoses or connectors.

You may need to pull the dash apart/out to resolve any of the three.  I'd start by getting the factory service manual and see how it all fits together, it could well be you can get at and adjust cables to make it better.

Good luck!

--Bryan

> On Nov 12, 2019, at 12:32 PM, Terri Benton via MSCW <mscw at lists.mscw1.com <mailto:mscw at lists.mscw1.com>> wrote:
> 
> '88 Convertible with 135K and owned from birth...
> 
> When heater is on 'face' - the air coming out is not very warm but when set
> on 'floor' its nice and hot down there. When set on 'both' - the floor is
> hot but face is hardly warm. Blower strength is fine. Its very strange in my
> opinion. Not sure if this is relevant but this past summer when A/C set on
> 'both' I got warm air on floor and cold on 'face'. When set to 'face'
> only....nice and cold. After driving a while the air on the floor does turn
> cold. Not being a mechanic I don't even know if there is something I can
> check easily to see if something about the air blending is not connected?
> Any advice would be very much appreciated.
> 
> Thanks in advance
> Terri