Good afternoon,
That line is for the transmission cooler. I attached a picture for you of the location of the line. You do need to remove that to get the fans out.
https://www.2carpros.com/articles/replace-electric-fan-motor
As far as your question, no, it does not harm leaving it disconnected for a day. You are good to hook it back up and go.
Roy
REMOVAL
1. Remove upper radiator crossmember.
2. Disconnect fan electrical connector.
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3. Remove fan module attaching fasteners and clips.
4. Remove fan module by lifting upward to clear radiator.
INSTALLATION
1. Install fan module.
2. Install mounting clips and fasteners.
3. Connect fan module electrical connector.
4. Install upper radiator crossmember.
Image (Click to make bigger)
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Tuesday, October 13th, 2020 AT 10:12 AM