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I've had coolant soaked carpets on a number of occasions and done along the lines you're thinking, either a carpet shampooer attachment with good suction or repeated rinsings with water and extraction with a shop vac. A shop vac can work well for this, especially in odd corners, even using a crevice tool. Start by blotting as much as you can with cloth and paper towels, squeeze hard. For the underpadding, do similar, lifting the carpet for access. Removing side panels and pulling up the plastic sill plates is worth the effort. On some models you may even need to unbolt the seat rails and lift the front to pull carpet tabs out (or just cut the tabs).
For everything, use water (like from a spray bottle) and suction/blot dry. Repeat rinsings until there is absolutely no more sticky feel of residual coolant, even if it means soaking the carpet.
If it's been there a while, use dilute bleach to kill and prevent mould under the carpet. If it's been there a really long time, check very carefully for any hint of surface rust and treat properly as needed. 240 floor pans are a known rust area (mosly the older models, 140s were the same).
To prevent smells or freshen, sprinkle baking soda underneath when you're done (I still see white powder when I lift the carpets, no harm done).
To speed drying, I'll prop a few short sticks under the carpet to keep it raised so the underneath and padding can air dry. Open the windows and doors (don't forget about the dome light). Use a fan/fans overnight as needed, even for a couple of days. Occasional heat will help it dry faster, like using a hair dryer or heat gun on low, but best not get carried away or leave heat unattended. I will admit to using heat lamps in damper weather, but I'm extremely careful to use extra shielding to eliminate any possible hazard.
If it's really bad, remove the entire carpet section and clean it properly using carpet cleaning equipment, hanging it carefully to dry so as not to stretch the formed carpet.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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