Heating up / Overheating under load

[lalozf]

did you checked the thermostat in the air filter, there is a tap that selects from hot/cold air.
The other day mine began to raise temperature and found that I was getting hot air, I fixed it and now temperature is ok, I leave you a link to some pictures,
http://www.volvo4life.es/foro/index.php?topic=19375.0