1993 Audi 90: Question about Cold Weather Noise from Engine

My car sounds like a child's toy lawn mower.... its a growling noise that increases with RPMs. It only acts like this when it is extremely cold or when its cold and damp.
Any ideas?
Thanks
Erik
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Erik G wrote:

Slipping alternator/PAS belt perhaps?
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.