The blower motor stays on high speed. Cannot adjust speed with switch.
Feb 19, 2024 at 4:57 PM
Blower motor stuck at high speed?
2004 MERCURY MARAUDER
TRUCKWES
- MEMBER
- 35 POSTS
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JACOBANDNICKOLAS
- ✓ASE Certified Mechanic
- 110,193 POSTS
Hi,
The speed is controlled via a blower motor resistor. Based on the speed requested, the power is directed through different resisters.
When the blower motor resistor fails, in most cases, the only speed you will have is high speed.
The resistor on your vehicle is located under the hood to the right of the blower motor itself and mounted to the firewall. I attached a pic below. Inspect that component to see if there is evidence if damage, being overheated, or connector/wiring issues.
Let me know what you find.
Take care,
joe
See pic below.
The speed is controlled via a blower motor resistor. Based on the speed requested, the power is directed through different resisters.
When the blower motor resistor fails, in most cases, the only speed you will have is high speed.
The resistor on your vehicle is located under the hood to the right of the blower motor itself and mounted to the firewall. I attached a pic below. Inspect that component to see if there is evidence if damage, being overheated, or connector/wiring issues.
Let me know what you find.
Take care,
joe
See pic below.
Image (Click to enlarge)
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Feb 19, 2024 at 9:14 PM
I will let you know what I find. Thank you
Feb 20, 2024 at 1:31 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.