What causes a GMC Sierra blower to fail?

The contact believes that the failure was caused by the rear differential or the abs. The vehicle has not been diagnosed by a dealer or mechanic at this time. The failure mileage was 205. The contact owns a 2005 GMC Sierra 1500. The contact stated that the resistor melted the grounding wire and caused the blower motor to fail.

What are the symptoms of a failed blower motor resistor?

Blower motor resistor problems. Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at high speed and doesn’t work at low speeds.

When did the blower motor on my Blazer stop working?

2005 T’Blazer, 6 cylinder, manual A/C controls. Maybe 6 months ago, blower fan speed 5 stopped working, followed by the rest shortly after. Following the great advice on this forum, I checked the blower motor resistor and plug, and replaced as advised.

Are there any problems with my GMC Sierra 1500?

See all problems of the 2004 GMC Sierra 1500 . The contact owns a 2006 GMC sierra. While driving approximately 45 mph, the contact noticed a burning odor. She then noticed that the blower motor on the wiring harness melted, causing the vehicle to smoke.

Where to buy blower motor resistor for GMC Sierra 1500?

If you prefer to shop in person for the right Blower Motor Resistor products for your Sierra 1500, visit one of our local Advance Auto Parts locations and you’ll be back on the road in no time! Use the fitment form at the top of the page to select your exact year and engine type for your GMC Sierra 1500.

Can a blower motor go out and smoke a resistor?

A blower motor that is going out can smoke a resistor. I lost #5 (no melting, relay in resistor crapped out) and after replacing the resistor the motor clamped at 23A and some change. I replaced the motor just to be on the safe side and it was right around 22A.

Where is the AC blower motor resistor harness located?

If you can no longer adjust the air speed with your AC controls or your AC system no longer blows chances are you need a new Blower Motor Resistor. This COMPLETE KIT includes the Blower Motor Resistor and New Wire Harness. The AC Blower Motor Resistor is located on lower passenger side dash and is easily accessible by removing a few screws.

What causes a blower motor resistor to melt?

Arching is what’s melting the connector. when you put the connectors together it may be a good idea to take a scratch awl or pick and squeeze the spade connectors in the plug tighter. You must log in or register to reply here.

How to replace blower motor resistor in 2004 Silverado?

This is not a good video on how to replace the resistor for a Silverado Blower Motor. The video is less than 4 minutes and if it takes you that long to replace the resistor sub-assembly it has taken too long. I will try to make better movies in the future. IMPORTANT: Watch my short Video on the Letter I got from GM. Loading…

Why does my blower only work on high speed?

If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. This is the most common failure mode. To repair the problem, simply replace the resistor block.

Why is my blower not working on my GMC Sierra?

When you switch to high,the blower motor relay coil circuit is grounded and voltage is now applied directly through the relay to the blower motor; bypassing the resistors. So, I would look to see if the relay is ok. It is a five terminal relay.

What happens if the blower motor only works on high speed?

In other designs, the failure of 1 resistor means you lose only one speed. However, most car makers bypass the blower motor resistor completely when you move the fan speed switch to high. If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. This is the most common failure mode.

Why is my blower not working in Hi ( 5 )?

The usual failure of the resistor pack is if it works in HI (5) but not in any other mode or just a few modes. When you switch to high,the blower motor relay coil circuit is grounded and voltage is now applied directly through the relay to the blower motor; bypassing the resistors. So, I would look to see if the relay is ok.

What kind of blower does a 99 Silverado have?

I suspect the blower resistor which I just bought at the dealership. My ’99 Silverado looks like a ’98 and has the 5.0 V8 so I wondered if the place I bought it had it advertised wrong. I found out mine is the ‘Carryover model’.

Why is my Silverado Sierra blowing cold air?

After fiddling with the controls a bit I gave up and rolled the windows down. About five minutes later it was eating at me so I switched the control from off to max and the fan kicked on like it was supposed to and was blowing cold air.

Where does the air come from in a GMC Sierra?

This 2005 GMC Sierra came in with the complaint that the air will only flow from the defroster vents, regardless of where it is commanded to. This Sierra has auto a/c controls and no floor mounted center console.

Is the fan speed set or intermittent on a Silverado Sierra?

Just the blower is intermittent, not the compressor. Fan speed does not have set speeds, it’s more like a rheostat. It has the rotary control.

How does a high speed blower motor work?

The blower motor resistor is what’s responsible for giving you three blower speeds. The resistor block contains three different high resistance coils. Think of these coils like a filament in a light bulb. The coil resistance causes them to heat up, thereby reducing the amount of voltage that can flow to the blower motor.