vauxhall vectra, 1.8 ls 1996. car heater trouble?

the fan heater in my vectra will only blow cool air, i have changed the thermostat (which isn't cheap on this model) only to find nothing has changed, still blowing cold air...
what else could it be ? any help very welcome !
thanks !!!
ryan, January 2005


done
the heater matrix is more than likely to be blocked mate

lee, April 2005
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