radiator fan

the radiator fan on my 2002 trailblazer runs on high speed all the time the code for this problem said fan high speed what can i do to fix this
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

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.