Red liquid dripping from roof of rv. Coming from AC where water usually runs.

Clear GE Silicone adhesive is almost bullet proof for that but make sure the area you will apply it is clean and dry if possible. Clean your caulking gun after use as this stuff gets... well, just clean up well.

condensate drain plugged in unit in roof under the units cover or evap is dirty and freezing up

Re: re-directing the water dripping over door ! Stop at RV parts store and get yourself a tube of "Dicor" self leveling sealant. It's recommended for rubber roofs, but works well on most roof surfaces.
Then I simply run a 3/8" bead of "Dicor" across wherever the run-off from AC is coming down, and re-direct it so the run-off comes off roof elsewhere. Don't try to smooth it out or anything, as I said, it is self leveling, just use a caulking gun, lay a bead about 3/8" and allow it to set for a few hours if you can. Make sure you pick a time where AC is off for a couple hours so (run-off) water isn't present. You"ll see the path (stain) on roof where it travels to guide you for redirecting. It's a simple fix, and no screws or nails required. Use the rest of the Dicor to fill in any gaps, cracks etc you see on sealant on the roof while your up there, but clean those before applying. If you can wipe your intended path down with some mild cleaner prior to applying bead, it will help it stick better as well. Even a little dish soap in water will do, just be careful, it gets pretty slippery when soap on there. Quick rinse with water then dry with rag, or let the sun dry it. Actually on a rubber roof, It should be scrubbed with mild detergent at least once a season anyway.

Does the unit work other, than the leaking?If it does you need to install a square seal between the ac unit and the roof.You can either buy the seal from Ebay or I would recomend an Rv Repair place.(They Might even be able to install it where the Rv Sits)

they do that its normal operation, you will get varying amount depending on your location and humidity. If it is not balanced or installed right it drips in the camper.

Basically there are holes in the base of the AC that allow water (condensation) to run out, that may be plugged, and usually you can tell by how much run-off you have on your roof, and the stain will also guide you to where to poke with wire to unclog. Best way to be sure is to take all the screws out around base of cover & lift cover off. Just watch for bees, or wasps before you do, they like to nest in there..If all unplugged & running out good but water still coming in trailer, then you may have a cracked drain pan.

Check run-of on roof & see if it's been reduced lately, it may just be a plugged drain at base of unit on roof.

Is this a new unit/RV by any chance?

Does water drip out of unit on the roof while running ? If you look under the unit on the roof, you should see one or two little drains sticking down., that may be plugged up. Piece of wire or something and poke in the holes on the sides of those drains to make sure they're clear. Usually there is a plastic/nylon pan on roof unit to catch that moisture, and drain it off. Could be overflow because of the plugged drains, or I have seen the odd one crack but not too much recently, mostly back 5 yrs ago or so they had a run of them.

Either your 14"x14" a/c gasket is lose on the roof allowing the condensation to flow into your RV or you have a cracked condensation tray under the evaporator. I'm guessing the later

JGRV