my heaters on my escort 1.8td van blow cold air?

my heaters on my escort van are blowin worm air for a few mins then cold how can i sort it??? i have checked my water and all my hoses and cant work it out,please help its freezin.
karl, January 2006


done
under the bonnet look were 2 small water hoses go through into the car interior usualy in the center of the bulk head,attached to these is a electrical sensor which you will need to replace.a very simple job should only take 10 miniutes.

william, February 2006
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