Volvo valve in air intake

[Roland Barmettler <roli@xxxx>]

Hi folks

I was just replacing a broken hose between the air filter and
some temperature driven Volvo valve. I wondered what the valve
itself is good for, since the engine seems to start and run fine
without it (ambient temperature < 10°C). Apparently it's mixing
hot air into the cold air stream.
Perhaps some of you know its purpose more detailed ?

Thank's in advance!

Greetings,
Roland

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Roland Barmettler - roli@xxxx - http://www.DeLorean.ch - VIN #11512