cap is off
You would have a leak, from either the pipes to the heater matrix (radiator), or the matrix itself.
could be hearer core lines answer antifreeze leak on driver side usually means either head gasket od a freeze plug leaking heater hoses generally go up passenger side
if u mean antifreeze then i would say the heater core but it is more in the middle to the passenger side but could just be running over there
You have to determine the source of the leak then decide on how to fix it.
heater core
water pump
Its probably a freeze plug. chhep to buy but its hard to get to
Heater core leaking?
Perhaps the radiator itself or lower hose - try pressure testing system to find leak
Moisture under your driver's side floor mat could potentially be antifreeze, especially if there's a leak from the vehicle's cooling system. However, it could also be water from rain, snow, or spills. To determine the cause, check for a sweet smell (indicative of antifreeze) and inspect for any visible leaks under the hood or beneath the vehicle. If you're uncertain, it's best to have it checked by a professional.
If it comes from the side of the motor and not from another source such a a leaing hose, then it is almost deffinatly a leaking head gasket. not a cheap or easy fix.
if it leaks on left side of engine at hose,could be a bad water pump! on 3.1 engine. if pump is bad it will leak out of releif hole on bottom of pump!