Engine problems on 2001 Ford 150 supercrew with 243,00

it is either a faulty part or when the heater core was installed the core was not installed correctly..they may have not reinstalled the mounting brackets for the heater core..incorrect instalation will either cause the brackets to rub through the core or allow the core to vibrate an break

Most likely there is a coolant leak in the heater core or one of the connections. The smell and fog coming from the AC vents points to coolant inside the AC/Heater blower compartment. Look for the AC drain hose under the truck and see if the coolant is coming from that. If so, that a sure sign of a leak inside the AC/Heater. Probably the core. There is no other source of coolant in that area. Hard to think a year old core is leaking but something there is. Could be the connections to the core.

Thanks for using FixYa.

Gaker

Sorry could not find an 5.0L engine, on an 01 Ford f-150, only engines for 01 f-150, 4.2L 6 cylinder, 4.6L and 5.4L V-8, I did find a 5.0L for Explorer and Mountaineer, hope this helps you, if not replied and I'll see if I can help you.This figures is for a 5.0L, but not f-150.

i had the same problem last fall it was a ground wire in bahind the driverside headlight the bolt rusted and broke

Try cleaning out the egr passages. That is usually what the problem is. The carbon builds up and has to be cleaned out.

you shouldent need to flush the engine just make sure you drain it good..10w30 synthetic is fine

If it was a fuse it wouldn't blow at all. Check coolant level. Change thermostat. If still not working possibly a heater core - symptoms of a bad heater core would be losing coolant, fogging of inner winshield with defroster on or wetness on passenger side floor.,

Have a look at this.

http://my.voyager.net/~sscully/F-15097HtrCoreRepairF150_Exp_002.doc

Lots of nice to know stuff on an otherwise all day heater core change. Pay attention to the notes on NEW o'ring sizes and what screws to keep together.

one common concern ive seen is the intake manifold gaskets leaking and causing lean codes

You have to remove the center dashboard bezzel out. Is held in place by pressure stubs only. After that, you remove the A/C control head. Look for a disconnected wire first. The tiny bulbs are located in the control's back. Feel free to email me for a diagram