Well if you live 4 - 5 miles away from the station I would think it
would plenty warm enough...
My S-70 is up to temp within a couple miles from home.
Keep in mind that clearing the ECL will only turn the light off for
a while.
You need to
1) clear the ECL
2) disconnect the ground strap on your battery (make sure you have your
cd player's activation code still)
3) reconnect the battery and drive over to the station.

It takes a hundred plus miles for the on board diagnostics to rebuild
the history data which was dumped when you disconnected the battery. The
sniffer station can/will read the historical data also so it has to be cleared.
This worked for me. :-) Good luck! also post back if all went well.
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vw bus site w/ Volvo section - http://www.geocities.com/vw_bus_74/index.html