Check the heater hoses for warmth at the heater core. Some designs do not use a waterflow valve, but instead always have heater core flow and use the air flaps to regulate heat.
Now there is a difference in some thermostats and the housings. Barely noticeable are the locking tabs inside the housing and on the thermostat ring. If you have this setup and the thermostat is not locked in place, you could get some bypass around the thermostat.
If you have an electric cooling fan, the Relay may be stuck, keeping the electric cooling fan running when it should not. This would overcool the engine.
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SOURCE: 93 ford festiva heater only blows cold air.
The heater only blows HOT air when set on defrost or floor settings. If you have the lever set for vent, only cold air will come out. Check to make sure you set the controls to floor or defrost. This is standard for all Festiva's.
SOURCE: My 1984 grand marquis does not have interior heat.
Sounds like a faulty blend door under the dash. The blend doors direct air thru the heater core and the vents. Your model should have vac controls so you could have a vac leak or a stuck door.
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