My xsara Picasso is overheating. What should I do?

Richard, there are a few possibilities. First check to make sure that you do have enough coolant in your reservoir. Then make sure that your fans are working. the Picasso has a two speed fan system. The second speed comes on when it gets hotter. If it does not come on check the rheostat on your fan. If that works okay, check your thermostat. It is possible that it is stuck. After that I would be looking at checking the water pump. No quick fix available but definitely a must to trouble shoot. You would not want to overheat your engine, warp the head and cause engine damage. So I would not drive it to much until you determined the cause for the over heating. In the attached diagram number 4 are the fan resistors and number 17 the thermostat Hope this helps, good luck.