All Air blows to only floor - 1995 Chevrolet K1500

most likely leak in one or more of the vacuum lines and or out door air damper not closing

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The problem is probably the electric actuator on the air mix damper in the HVAC box - a common problem and probably needs replacing.

Often a sign of a blend door problem. The blend door or doors are in the heater a/c box behind the dash.

go by liquid coolant and check ur heat and ac fan it might be stuck or broken

probably a vaccum problem for youe vent control switch.

My 05 Pacifica is having similar issues. Did you solve your problem?

Hi. Have your car aircon evaporator cleaned. Check also the drain hose. All water should go out of the car through the drain hose. There might be something clogging up the hose that is why water will run out the floor and that causes also the aircon to work intermittently.

Have a good one!

Switch or relay. Get shop manual and test the switch the way it tells you to. The relay you can open and look for any signs of corrosion or burnt terminals. You can ohm the terminals out to check for resistance issues . Use the shop manual it will give you the correct testing procedure.

Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.

yes those controls are vacuum controlle. Could be as simple as a bad hose or connection.