Hello chas1, the Espace II resistor pack is in the engine bay (sorry Donald its the Espace III that is in the dash) behind the firewall sound deadening, you can change it without stripping the heater motor etc out but you need to be a contortionist to do it .... do a search for heater, blower and resistor pack, I have posted several items about this ... also if you dont find it try searching for my posts as well.
If you did searches before check your spelling its RESISTOR not resister. (school teacher off )
Its ok ... I'll forgive you all .... going on holiday so feeling chilled .....
chas1 ... full marks for your spelling, hope you get it sorted ... its really not that difficult, its just a pain ... also check the heavy fuses under the air filter housing ... they might be causing the problem, worth checking first .. check the posts.