I cant figure this one out. I searched and searched and nothing.

2010 150 xlt 4.6 4x4 110 thousand miles. no warranty. No CEL codes. ABS light on.

Replaced pressure sensor on the ac line. If I short the compressor to the battery it turns. When short where the relay is it wont turn.

Replaced the ac controls in the center console.

Outside temp sensor works.

Havent checked internal temp sensor but its most likely near the heater core.

Uv sensor works, (lights auto on and off)

I do have an edge programer and once My battery died. Truck never came back to stock.

Could it be the ECU needs to be flashed?

The heatercore and ac are one. They say I need to replace the whole thing IF its bad and that requires taking out the dash.

Anyone had this problem? Blower motor works. Cant find anything online. I even have the service manual and cant figure it out.

 

My father has a 2009 with a similar issue. Blower motor would only kick on for 1 second before shutting itself off. No A/C. It is at the dealer now, and they've said it is a computer module that needs replacing. If I find out more, I'll post here.
Good Luck!