Heater matrix replacement

It looks like I need a new heater matrix for my 98 A4 Avant Q , 50000 miles.Can anyone give me an idea of the cost involved (not doing it myself!) and the time it would take?

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.