Skip the auto shop - Our mechanics make house calls

Q: Blower fuse gets HOT!!

asked by on

My trucks blower fuse keeps getting so hot it's melting the solder out of the outgoing end of the fuse but not blowing the fuse. It has gotten so hot as to have melted the plastic around the fuse holder. I have replaced the blower motor, the fuse panel, and tried using a busman 20 amp circuit breaker to replace the fuse but even it is getting hot. Please help!

My car has 76000 miles.
My car has an automatic transmission.

A: Hi there. Which side of the fuse is getting...

Hi there. Which side of the fuse is getting the heat? Does it stay hot all the time? It is highly recommended to not install a higher rated fuse as this may cause system damage. If it’s the blower circuit side, there is excessive amperage draw on that side of the circuit. If it’s on the power side, then that is the side with the excessive amperage draw. On the power side, use a digital volt/ohm meter to perform a voltage drop test and see if there is excessive voltage drop. If there is excessive voltage drop, there is a resistance concern on that wire; it could be corrosion or a breakage in the wire. Perform voltage drop tests on the blower circuit wires and correct as necessary. The blower resistor could also be a source of the hot fuse concern. The blower resistor changes the resistance of the circuit based on fan speed selection prior to power getting to the blower. A fault in the resistor may be causing an excessive draw. I strongly suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with an electrical problems inspection.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My passenger window goes down but not up.

Windows motors are designed to move in both directions and if you operate the motor in both directions and hear the noise inside the door like a grinding noise, then you have a bad window regulator. It is possible that...

Q: Vehicle refuses to start.

Hi, there are 3 things your car needs to start: Air/fuel, compression, ignition. If one of these things is missing the car will not start. I would recommend having a technician come out and test these systems for failure. Most...

Q: Car hard to steer after making noise

It sounds like you may have a bad water pump that caused the belt to come off. I would suggest having a technician come out and look at the car and inspect what caused the belt to come off and...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.