One problem related to vehicle overheat has been reported for the 2008 Ford F-550. The most recently reported issues are listed below.
Vehicle overheats and looses power at different speeds; we had over $1100. 00 in repairs done and it still overheats with the wrench light coming on, took it back to mechanic and he ran the codes and now says it is the oil cooler not working. Ford said they do not have a recall on this and the heart of texas Ford place in brady, TX mechanic said there are alot of complaints on this oil cooler part for the f550 6. 4 diesel.