S70 Heating Problem

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G R Easton - 08 Sep 2007 16:27 GMT

I'm having a problem with a 1998 S70 heating system; with the heat turned
up, hot air is only coming from the side vents. The center vents are blowing
cold. There is lots of heat from the sides but nothing at all in the center
in any setting(Heat, Defrost, etc.) I suspect either a vacuum leak or bad
servo/valve. Anybody pint me in the right direction on where to start?

TIA

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Tim.. - 09 Sep 2007 13:16 GMT

> I'm having a problem with a 1998 S70 heating system; with the heat turned
> up, hot air is only coming from the side vents. The center vents are
> blowing cold. There is lots of heat from the sides but nothing at all in
> the center in any setting(Heat, Defrost, etc.) I suspect either a vacuum
> leak or bad servo/valve. Anybody pint me in the right direction on where
> to start?

Turn the Fresh air / heater output knurled wheel to the heater output
position!

Tim.

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G R Easton - 10 Sep 2007 02:30 GMT

>> I'm having a problem with a 1998 S70 heating system; with the heat turned
>> up, hot air is only coming from the side vents. The center vents are
[quoted text clipped - 7 lines]
>
> Tim.

Thanks, but tried that to no avail. I suspect a bad servo/valve

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