Xantia Heater Blower Staying At One Speed Then Turning Off

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Hi there

 

I have a problem with my xantia heater.The fan works perfect when controlling the speed of it on fast and slow but doesnt blow any air out of the vents as ive found out its spinning the wrong way round. I changed the red and black wires roung on the blower and it blows air out of the vents but blows fast for about 10 seconds then dies down to a constant slow speed theat you arent able to change then makes a few strange noises and dies on me.

Any ideas or suggestions would be greatly appreciated as driving with the window down aint the best in january weather lol.

 

Kevin