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.
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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.
CHECK FOR LOW COOLANT,NOT ENOUGH COOLANT IN THE SYSTEM.IF COOLANT LEVEL OKAY.THERMOSTAT NEED CHANGING STUCK OPEN.IF THERMOSTAT BEEN REPLACED.CHECK BOTH BOTH RADIATOR HOSES AND HEATER CORES HOSES THEY ALL SHOULD BE VERY HOT.IF ALL HOSES HOT AND BOTH HEATER CORES HOSES GOING INTO FIREWALL IS HOT.HEATER DOOR NOT OPEN ALL THE WAY OR STUCK.IF ONE OF THE HEATER HOSES GOING INTO FIREWALL HOT AND OTHER HEATER HOSE COMING OUT OF FIREWALL NOT HOT.MORE LIKELY HEATER CORE PLUGGED NEED TO FLUSH OUT COOLING SYSTEM.FLUSH OUT COOLING SYSTEM IF NOT BEEN DONE IN A LONG WHILE.
check coolant level first. possible bad thermostat, blockage, heater core is bad. check to see if a hose going into heater core is hot, if the hose is hot and the other is cold you have a blockage in heater core. if so, sometimes you can remove the hose from heater core and flush it out with a garden hose. if above fails, flush whole system.
Check the coolant level.Feel the heater hoses going to the heater core to see if they are warm,or hot.If one of them is warm,or hot,and the other is not,remove the heater hoses,and flush the heater core out with a water hose.Bleed the coolant system,and you might want to install a new thermostat while you are at it.
If no coolant flowing through the heater core then ther is no heat. There are 2 possible root causes needed to check out:
1- THE VALVE TO CONTROL THE COOLANT FLOWING TO THE HEATER CORE IS NOT OPENING AS DESIRED.
2- THE HEATER CORE GOT CLOGGED UP AND NEED TO BE FLUSHED.
i had the same problem with my 2000 chevy truck!! i took both hoses off engine and flushed the heater core with water and air frome air compresser,added new coolent and it works perfect!!!! so try flushing your system............