I cant get my 2000 ford focus heater to switch blowing frow the floor to blow to the defroster or air conditioner vents. It just stays blowing to the floor

SOURCE: Vent control

You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.

SOURCE: My 95 Ford Mustang will only blow air out the

check for a vacuum leak from the vacuum source on the engine to the heater control head.


defrost is fail safe mode.

A/C Vacuum Reservoir Tank and Bracket Removal and Installation

1. Open the glove compartment (06010) .

1. Working through the glove compartment , remove the vacuum reservoir retaining screw.

1. Remove two vacuum hose tubes from the check valve and remove the A/C vacuum reservoir tank and bracket (19A566) .

1. To install, reverse Removal procedure.
   
   A/C Vacuum Reservoir Tank and Bracket
   
   
   

SOURCE: heater is blowing but its cold air not hot air 2000 expedition

Make sure the heater core is in the open position by using the shut off valve and turning it to open. next, you may have a malfunction in the direction door the directs the air flow in the dash. a lever may have become lose or separated. may be a bad servo motor not directing the door to move to the heater position. i would start by checking that shut off valve first on the heater core.

SOURCE: 1998 Mustang - AC blows only through Defrost vents

You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.

SOURCE: 97 Ford Econoline air conditioning and vent settings blowing hot

I know from experience that if the coolant is to low ( not just the freon levels in the compresor but the antifreeze/coolant level as well) the AC system will not cool and will blow hot. Check the coolant Antifreeze and freon levels, even with the Coolant being a little low my 1998 Ford E150 Van will blow hot. After you have ruled out of these possibilities and the chance it is the thermostat most likely the problem is what Ford calls the "Flap" it controls the air flow through the vent system when you switch from Heat to AC. When the Flap is working it closes off one systems air flow so as to not interfere with the current climate selection.