Keep heated or cooled air moving through the cab with the Four Seasons blower motor, part number 35577. It is a direct-fit replacement for the 1983-1993 Mack MR and 1983-1991 Mack MC. This single-shaft, vented motor drives the blower wheel that pushes air through the HVAC system and out of the vents.
- Design: Single-shaft, vented motor with CW/CCW rotation, supplied without the blower wheel.
- O.E. match: Equals or exceeds O.E. design and performance.
- Magnetics: Magnet size and properties compare to or exceed OEM.
- Windings: Match or surpass OEM specifications.
- Speed: Motor RPM is equivalent to or greater than the OEM motor.
Four Seasons says it engineers and tests its products for trouble-free operation. The company also draws on more than 50 years of mobile A/C experience.
The blower wheel is not included. Transfer the original wheel if it is in serviceable condition, or fit a new one, following the vehicle service procedure.
Signs a blower motor may need replacing include weak or no airflow at the vents, a motor that runs only intermittently, and grinding or squealing from the blower area. A resistor, switch or wiring fault can cause similar symptoms, so diagnose the circuit before replacing the motor. If a failed motor is the cause, this unit replaces it. See the "Vehicles it fits" section for complete fitment details.
Frequently Asked Questions
Which trucks does this Four Seasons hvac blower motor fit?
It is listed for the 1983-1993 Mack MR and 1983-1991 Mack MC. Check the "Vehicles it fits" section for your truck's exact details.
Does the blower motor come with a fan wheel?
No. Part 35577 is supplied without the blower wheel, so transfer the original wheel if it is serviceable or install a new one.
What does CW/CCW mean on this motor?
CW/CCW stands for clockwise/counterclockwise. It is the rotation designation Four Seasons lists for this single-shaft, vented motor.
What are signs the blower motor may need replacing?
Weak or no vent airflow, a motor that works only intermittently, or noise from the blower area. A resistor, switch or wiring fault can cause similar symptoms, so diagnose first.
How does it compare with the original motor?
Four Seasons states it equals or exceeds O.E. design and performance, with magnet size, windings and motor RPM that match or surpass OEM.
