37357 RV Furnace Blower Motor 12V DC | Double Shaft Replacement for Heater Furnace Systems

37357 RV Furnace Blower Motor 12V DC – Double Shaft Replacement for Heater Furnace Systems

The furnace blower motor is the component that circulates air through your RV furnace’s heat exchanger and into the living space. It draws in cool air from the RV interior, pushes it through the heated heat exchanger, and distributes warm air through the ductwork. A failing blower motor can cause weak or no airflow, overheating of the heat exchanger, strange noises, or complete furnace failure.

This 37357 compatible 12V DC RV furnace blower motor features a double shaft design with squirrel cage blower wheels on both ends, providing balanced airflow and efficient heat distribution. It’s designed as a direct replacement for Atwood, Suburban, Dometic, and Hydro Flame furnace systems, making installation quick and easy.

Compatibility

• Atwood Hydro Flame 85-IV series: 8516-IV, 8520-IV, 8525-IV, 8531-IV, 8535-IV
• Atwood Hydro Flame 89-III series: 8916-III, 8920-III, 8925-III, 8930-III, 8935-III
• Atwood AFMD series: AFMD20111, AFMD25111, AFMD30111, AFMD35111
• Atwood 7900-II series: 7912-II, 7916-II, 7920-II, 7924-II, 7932-II
• Suburban SF series: SF-20, SF-25, SF-30, SF-35, SF-42
• Suburban NT series: NT-16, NT-20, NT-24, NT-30, NT-34, NT-40
• Dometic DFMD series (rebranded Atwood): DFMD20121, DFMD25121, DFMD30121, DFMD35121
• Replaces part numbers: 37357, 37697, 30133, 33488, 31501 (motor assembly)
• Most 16,000-40,000 BTU Atwood, Suburban, and Dometic RV furnaces

Specifications

Installation Guide

1. Safety first: Disconnect 12V power at the battery. Turn off propane supply. Allow the furnace to cool completely.
2. Access the furnace: Remove the furnace exterior access panel. The blower motor is typically located at the rear of the furnace. You may need to remove the furnace from its mounting for easier access.
3. Document connections: Take photos of the wiring and blower wheel positions before disconnecting.
4. Disconnect wiring: Unplug the wire connectors from the motor terminals (two wires — polarity doesn’t matter).
5. Remove blower wheels: Remove the set screw or clamp holding each wheel to the shaft. Gently slide the wheels off. Be careful not to bend the wheel fins.
6. Remove old motor: Unscrew the 2 mounting bolts holding the motor to the furnace housing.
7. Install new motor: Insert the new 37357 motor into the mounting position. Secure with the 2 mounting bolts.
8. Install blower wheels: Slide the squirrel cage blower wheels onto each shaft. Align so they don’t rub against the housing. Tighten the set screws. Spin by hand to verify free rotation.
9. Reconnect wiring: Plug the wire connectors onto the motor terminals.
10. Test operation: Reconnect 12V power. Turn on propane. Set the thermostat to call for heat. Verify the blower motor starts, airflow is strong, and the furnace runs through a complete cycle.

Common Symptoms of a Bad Blower Motor

• Weak or no airflow from the furnace vents
• Furnace ignites but shuts down quickly (overheat switch trips)
• Loud grinding, squealing, or rattling noises
• Blower motor runs but slowly or intermittently
• Motor doesn’t start at all
• Burning smell from the furnace
• Blower wheel wobbles or vibrates excessively
• Furnace short cycles (on and off frequently)
• 12V fuse for the furnace blows repeatedly

Frequently Asked Questions

Q: How do I test if my blower motor is bad?

A: First, check if the motor is receiving 12V power when the thermostat calls for heat. Use a multimeter to measure voltage at the motor terminals. If 12V is present but the motor doesn’t run, the motor is likely bad. You can also test the motor directly by connecting it to a 12V battery. If it doesn’t spin or spins slowly, the motor is bad. Also check the blower wheels — if they’re restricted or rubbing, the motor may not be able to start.

Q: What’s the difference between 37357 and 37697?

A: 37357 and 37697 are essentially the same blower motor with different part numbers for different production runs or furnace models. Both have the same specifications: 12V DC, 2250 RPM, double shaft, 1/8″ shaft diameter, 2-bolt mounting. The 37357 is fully compatible with all furnaces that used the 37697, and vice versa. If your old motor has either part number, this replacement will work.

Q: Can I replace just the motor or do I need the whole assembly?

A: This listing is for the motor only (without blower wheels). In most cases, you can reuse your existing squirrel cage blower wheels — simply remove them from the old motor and install them on the new motor. This is the most cost-effective repair option. However, if your blower wheels are damaged, bent, or heavily corroded, you may need to replace them as well.

Q: Why is my furnace making a loud noise?

A: Loud noises can have several causes: (1) Bad blower motor bearings — grinding or squealing noise that gets louder over time. Motor needs replacement. (2) Loose or damaged blower wheel — rattling or vibrating. Check set screws and wheel condition. (3) Wheel rubbing housing — scraping noise. Adjust wheel position. (4) Debris in blower — clicking or rattling. Clean the blower wheels. If the noise is a high-pitched squeal or grinding, it’s most likely the blower motor bearings.

Related Products

• Atwood Hydro Flame Furnace Blower Motor (37697) — Alternative model for Atwood 8525-IV, 8531-IV
• FAN 50 PLUS Ignitor Board — Universal 12V furnace ignitor board with fan control
• 31501 RV Furnace Ignition Board — Compatible with Atwood & Dometic Hydro Flame furnaces

Need help finding the right blower motor for your RV furnace? Contact our technical team with your furnace model number. Free shipping and duties included.