Most 350's operate in the 190 to 210 degree range so the hoses need to be able to withstand at least those temps.
Chevy Cavalier should run about 195F or 91C
According to the book it should be #12.
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If you cannot change the temperature from cold to hot on an Equinox or Pontiac Torrent, a common cause is a broken temperature door. This is a very difficult repair.------------------------
It depends on the ambient temperature, but at least a couple hours.
This is an extremely big job to remove the Heater A/C case on Chevrolet Equinox and Pontiac Torrent when there is a problem with no heat or can/t adjust temperature. ----------