I'd double check your coolant level - this can be an indication that there isn't enough water in there to reach the heater matrix. If so it would be a good idea to check for leaks and keep an eye on the fluid level, otherwise you may find yourself seriously overheating the engine, or having head gasket problems (if you haven't already).
Matt
October 2004
there is a electric valve fitted near the wiper motor it will be this that need replacing
RS
October 2004
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