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problems with heater?

i have problems with my 1998 ford fiesta i have changed thermostat but its still blowing cold what can it be?
sharon, February 2009
Hi I have had the same trouble with my taxi and it was an air lock in the heater matrix which needs flushing through and bleeding, the worst case scenario is there is a small leak in the head gasket which is putting air into the heater lines.

Richard, October 2009
how do i flush the whole system including the matrix is it a garage job?

shaz, February 2009
Could be the heater controls - check them. Could be a blocked heater matrix. I'd try flushing the entire cooling system including the heater matrix and then refill with fresh antifreeze solution. A lot of gunge and sediment can build up if the coolant has never been changed in 11 years.

Chicks Fan, February 2009
link Click here to see other fixes for Ford Fiesta.