need some help please 2003 F150 ,5.4 FX4 overdrive light flashes took to a shop they said overheating issue ,but I don't understand if it is a overheating issue why does I flash at 4 in the morning when I leave for work fter sitting all night and why does it stop when I do over 70 on the highway any suggestions would be very helpfull

 

The first suggestion is to get the code and post it here so we can see to be sure.
When you cold drive off, the temp sensor on the valve body keeps OD from functioning until the fluid temp get to about 100 degrees.
This is normal.
After that the sensor will trip a code for too high a temp. if that happens otherwise it's a sensor only issue.
If the torque converter never locks up and you are under heavy load too long the fluid could over heat but doubt that is the case or you would have a code for the torque converter lockup malfunction.
Get the codes and post so we can see to be of help.
Good luck.

 

Bluegrass7,found out what the code was giving on the transmission PO712 the garage said its a sensior problem but not sure if it is outside the trans or inside,is it hard to fix and can I do it or does it need to go to the garage

 

712 is the temp sensor circuit 'low', a shorting condition.
It's on the valve body inside.
It could be the ribbon cable inside or the harness. They were set up both ways depending on the year.
The sensor resistance would normally be approx. 30,000 ohms at 70 degrees and approx. 15,000 at 150 degrees fluid temp. and goes lower as the temp. goes higher.

You have to drop the pan, and get replacement fluid, new gasket and filter and 'the' sensor part, if needed.
Do research to find where the sensor is located first.
As for what it does now is of little consequence until it's repaired if your running normal and not towing except it may play games locking out over drive, the torque converter and make shifting feel changes etc.
Pays to get it repaired soon and not wait trying to get away with it. Still cost the same except of any further possible consequence of driving with the condition.
You could have the shop do it and have it over with for the effort it takes.
Good luck.

 

Bluegrass7,thanks for all the hlp found out that I had 4R70W tranny in my truck talked to ford dealership today and got the ribbon and sencer for 55 dollos and some change and shop is going to insall on wensday when they inspect the truck thanks for the help i'll keep ya all updated on progress thank you again