S70 Heating Problem

[G R Easton]

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

 

[Tim..]

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.

 

[G R Easton]

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

Tim.

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