Car heater

[Lindy66]

Have a Fiesta N reg and the heater inside is not working just blows out hot air.
Before taking it to a garage too look out and no doubt charge a fortune, are there any checks I can do first to try and fix the problem.
Thanks

[NORMANTHEDOG]

change the thermostat,its stuck

[gsr600]

if the HEATER blows out HOT air what's the problem
it's working fine

[twazerk]

thermostat, pmsl.

It will be the heater control valve located on the bulkhead at the rear of the engine compartment slightly to the right, you will see two hoses going to it. they are about �26 from your Ford parts centre.

[Lindy66]

Meant to say it blows out cold air..

[david1702198]

possibly air locked or a coolant leak.

[athurh]

The thermostat is stuck ,it needs a new one.a easy job to do yourself.

[JimmyK]

It is not possible on the information given to conclude the thermostat is stuck.
Does the temperature guage go up to the level it usually does? If not then it is probably the thermostat. If it does go to its usual level, then it could be a valve in the heater circuit that has failed (but that depends on the age of the vehicle, older ones didnt have a valve but newer ones did: I do not know at what year they had them in Fiestas).
It could also be an air lock, some cars get these and have bleed valves in some hoses, some dont: I have not seen any bleed valves on any of the several Fiestas I have worked on.