Ford F150 A/c

Check out your idle sensor on your throttle body, had the same problem on my '06 4.6 liter..

it may be the incorrect blower motor as one may be full auto and other may be manual a/c also it is possible that the high blower resistor is burnt also

thee is a correct method to fitting power steering hoses to prevent this It is just not a matter of putting it in and tightening it up
Take it to a steering specialist shop to ensure that the fitting is correct and have it done,

you can use three different gauges and get three different results with a calibrated gauge the readings 125-165 with a no variance greater than 15 psi for smooth idle 25 psi slight rough idle. test calibration against a air compressor blow a air chuck into gauge and compare to compressor gauge.

bad heater control switch or resistor.

This is a symptom of the Blower motor resistor is out on the lower settings.

Easy enough to change, and I think it is still ~ 25.00 from the dealer ( or Ford dealers that sell parts online ).

Most just lay on the passenger floor to do the work, it is facing down.

This is a picture of the blower motor resistor installed, taken from the passenger floor


It could be just the blower motor resistor itself or the resistor and pigtail

your going to have to get under it to see if it is gummed up. Spray penetrating oil liberally on those connecting rods and try to move it. Remember,,,,no matter what your manual says or the dealer that squawks about 4 wheel on the fly... come to a stop, put it in neutral then shift in to 4 wheel.

replace nuetral safty switch for gear shifter and check window relays

Check for a restriction like dirt covering the evaporator core fins in the dash.

sounds like you have a vacuum leak. there should be 2 hard plastic lines in the engine compartment on the passenger side. When I had this same problem it was because they had gotten melted in 2 by the exhaust manifold.