My 2007 F150 blower will not blow on the low setting

SOURCE: 1998 F150. Blower fan only operates at high speed.

Hi!!

The problem is the Blower Motor Switch/Resistor. Replace it. $20 at AutoZone or similar Auto parts store.

Good Luck!! Don't forget to rate this post!!

SOURCE: F150 2004 blower working only on high position.

this is because your blower motor resisters are burned out for speeds 1,2 & 3. High speed does not have a resister.

Replace the resister. If it goes a 2nd time, it is because your blower motor is failing & drawing too much current.

it is behind the glove box I think. It is in the plenum case where air blowing on it keeps it cool.

Easy repair. May need to access throught glove box which should open all the way down when you squeeze the sides in.

Go to tascafordparts.com for a discounted resister.
Please rate as solved problem if this is what you needed.

------------------------------------------------------------------------------
Manual Climate Control System Outputs
Blower Motor Switch Resistor
Blower Motor Resistor Coils Blower Motor Thermal Limiter The heater blower motor switch resistor has the following features:

• The assembly is located on the passenger side of the plenum assembly behind the glove compartment (06010).
• Three resistance elements are mounted on the resistor board to provide four A/C blower motor speeds.
• Depending on the heater blower motor switch position, series resistance is added or bypassed in the A/C blower motor circuit to decrease or increase A/C blower motor speed.
• An overheating protective device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F), interrupting the blower motor operation in all speeds except HI.
• The thermal limiter cannot be reset and is not serviceable.

SOURCE: WHERE IS THE LOW PRESSURE PORT FOR A 2001 FORD F150?

It may be located on/near the evaporator case where the big (suction) line comes out.

SOURCE: Heater blower switch only works in postions 3 and 4

Heat limiting capacitor is blown on low side. Limits excessive heat to components. Three capacitors on one board. One is constant. One runs two lower speeds and other runs two higher speeds. Need to replace. Follow wire from blower motor back towards center of vehicle. The capacitor is approx. 1.5" X 2.5" and is mounted with two screws. Simply remove plug and two screws, pull out capacitor. Replace with new in reverse order. Did last year. Part was relatively cheap and easy to replace. You do have to be somewhat limber to fingers and tools under there.
Good luck.

Ronny Bennett Sr.

• 6988 Answers
• Posted on Aug 04, 2010

SOURCE: My blower motor on my car won't run when put on

The blower motor resister module is bad,even if the blower motor sounds good,it is the cause of the resister failing,the blower motor is drawing too many amps.So change it also,the resister is located near the blower motor,and is mounted on the blower box,but actually goes inside the blower box to keep it cool.If this was at all helpful,please rate thank you.