1991 ford tempo GL overheating

Hello. My son-in-law has this car & it is overheating. The thermostat has been replaced yet it still overheats. Is there a temperature regulator or something else we should be looking for?
Regards, TC
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.