Hello everyone,
I'm having some AC blower speed issues that I hope someone can help me with.
I have a 03' F350 Super Duty with the 7.3L. The 3rd speed on my ac blower is the same speed as 2nd. To sum up I have 1,2 and 4 speed fan. 3rd blows same speed as 2nd. I have replaced the resistor and switch. Anyone have any idea on what to try next?

 

Did you check the plug to make sure that it's
nit going belly up?

I would dig up a wiring diagram and start tracing
wires to see where the fault is.
In the 06 information it says to look at the
switch and the relay. If you have already replaced
the resistor then having a look at the switch would
be a good idea.

Sean

 

Thanks for the suggestion. I have replaced the switch as well. Guess I will have to do some wire tracing like you said.
Anyone know off-hand where I can find a wiring diagram?

 

Try here >>> ALLDATA - OEM Auto Repair Information for Professionals

There is one other and I can't find the link right now.
If I find it I will post it.


Sean

 

Is this a pretty good service? Anyone use it? Don't mind paying for a service so long it is good useful information.

 

I have before I got the Ford DVD service manuals.

There is also one from Ford but I don;t have the link
along with one other and I have not used but have heard
good things about. You might try a search with the
Search bar at the top of the forum or use this link
to the advanced search.
Ford Truck Enthusiasts Forums - Search Forums


Sean