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Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 15572
Experience:  Have owned a repair shop for 25 yrs.
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Blower motor resistor gets so hot it actually cracks the

Customer Question

blower motor resistor gets so hot it actually cracks the circuit board. i have replaced the resistor 3 times from different companies, the blower motor and the plug in to resistor. we unplugged the switch and jumped the wires with the same result. new blower motor has batter voltage and is drawing 14 amps
JA: Thanks. Can you give me any more details about your issue?
Customer: always works on high with out issue
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Submitted: 11 months ago.
Category: Chevy
Expert:  Tim's Auto Repair replied 11 months ago.

Hi, My name is ***** ***** for the delay.

I will do my best to assist you

what is the year,make,model and engine size?

are you saying you did replace the blower motor?

Customer: replied 11 months ago.
2005 Chevy Malibu 3.5. And yes replaced blower motor and pig tail plug in for resistor
Expert:  Tim's Auto Repair replied 11 months ago.

the motor is pulling too many amps...is it grounded well?

Expert:  Tim's Auto Repair replied 11 months ago.

maybe try running a ground wire from the motor to the body of the car..for it to pull this many amps ,,it seems it isnt grounded well

Customer: replied 11 months ago.
ran a new ground from blower motor wire at plug in to body ground
Expert:  Tim's Auto Repair replied 11 months ago.

this doesnt make sense,,

where are you getting the resisters?

Customer: replied 11 months ago.
Got 2 from advanced Auto and 1 from oreilys
Expert:  Tim's Auto Repair replied 11 months ago.

lets try one from the dealer...there is just no other reason for this..nothing else left.

Expert:  Tim's Auto Repair replied 11 months ago.

do you need a part#?

Expert:  Tim's Auto Repair replied 11 months ago.

Parts InformationOEM Part #Price

Blower Motor Resistor

Resistor

Without ATC

15831065$45.00

Contact Dealer for most current part and price information

With ATC

15855749$173.26

Contact Dealer for most current part and price information

Customer: replied 11 months ago.
I can get it. I am going to try another blower motor first and then go the dealer route
Expert:  Tim's Auto Repair replied 11 months ago.

yes,,that would be what to do..

this is somewhat kinda strange.

Customer: replied 11 months ago.
Looking at schematic, it appears bcm has internal relay. One side of relay controls the resistor voltage low, med low, and medical high. The other side controls high only. Could there be a problem there
Expert:  Tim's Auto Repair replied 11 months ago.

there is always be a possibility it being the bcm,,but,that doesnt explain why the resister would burn up to me.

Customer: replied 11 months ago.
Just tried new resistor from dealer and with in 20 seconds got so hot I couldn't touch it without burning my fingers
Expert:  Tim's Auto Repair replied 11 months ago.

the resister will get hot...did you try another motor?

Customer: replied 11 months ago.
I did try the other motor with the same results. Is it going to get hot enough to burn a blister on my fingers? I'm sure it will get hotter due to voltage running through it and the blower will provide some cooling. But getting that hot? Idk
Expert:  Tim's Auto Repair replied 11 months ago.

they get pretty hot..

\all i know to tll you on this one,,is to run it and see if it holds up..

this doesnt make allot of sense.

thanks

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