MarkBytes

The hot weather has brought my attention to another problem (???) on my 1986 951.

When the cabin fan is on full blast its loud, but works. If I crack a window or sunroof the air volume dramatically increases and the wind noise decreases.

First Question: Is this normal??

I would suspect that a 1986 car of this design would have some sort of flow thru ventilation. I notice vent grates in the door and door jamb, but nothing coming thru the door panel. I'm a little suspicious that a previous owner may have covered something up during door speaker installation(?)

Second Question: Should there be some sort of vents in the door or somewhere?

Thanks! Signed, Hot in Philly

Eric

Mark,
first question: Do you have the re-circ. air switch engaged when this occurs? If so, and the fan were running on "high" and you opened a window/roof, that would allow much more air into the "closed" air re-circ. circuit, which would result in more air being fed through your car and the vents--sound feasable?

second question: There should not be any vents coming through the door panels on your 951. I was never too impressed with this cars' vent system. Mine always seems to emit warm air out of the two outermost vents unless the ac is on full-bore.

Eric(also in the Keystone state)

Seattle944t

The cabin is fairly well sealed, so the HVAC fan has to work pretty hard to pump air into the cabin. So opening a window reduces the back pressure (so to speak) of the cabin. So the same RPM's on the fan are now moving a much greater volume of air, with less resistance.

So, Yes, this is normal

But with A/C on, and re-circ on it should be downright chilly. May want to get your freon level checked out.

MarkBytes

Eric and Seattle,
Thanks for the replies. I was not using Recirc, but expected the cabin would have "flow thru". Oh well....at least its not broke.

Thanks again!

Black_951

I have been playing with the recirculate button this week and am not hearing anything happen when I turn it on or off. Should the air flow change somewhat? Or should there at least be some sort of sign that recirculate has engaged?

If so, I am not getting any of this. The light does come on when I push the button, so whats happening?