Sparky’s Answers: 2005 Chevrolet Silverado Blower Inop

10 Dec 2014 | Author: | Comments Off on Sparky’s Answers: 2005 Chevrolet Silverado Blower Inop
Chevrolet Silverado

Wednesday, July 30, 2008

2005 Chevrolet Silverado Blower Inop

This is a very common problem on 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 and 2007 Chevrolet Silverado and GMC Sierra trucks. Over a period of time the resistor and usually the connector overheat and blower operation stops in some or all speeds.

The blower resistor is located on the passenger side of the vehicle behind the glove box. There is a plastic cover that has to be removed to gain access to the resistor and wiring.

After the cover is removed disconnect the harness connector and inspect for damage. On this particular vehicle the only terminals that were damaged were the third from the right and the third from the left. Sometimes all of the terminals will be damaged and the plug will be melted to the resistor as shown in the last pictures.

After thoroughly inspecting the connector for damage the terminal retaining comb was removed from the old and the new harness connectors. The good wiring was transferred one at a time from the old connector to the new connector. A terminal extracting tool is needed to do this. The locking tab must be slightly depressed before the terminal can be removed from the connector.

A solid piece of wire such as a larger paperclip could be used if a tool is not available. If you do not have an adequate tool or experience this should not be done. Cut the wires one at a time and splice in to the harness using a quality butt connector.

Be sure to stagger the spliced connectors as much as possible in order to have a neater and less troublesome repair.

Retape the harness and install the new blower resistor and harness connector. As with any wiring repair that involves a burnt connector, the connector and the component that it attaches to must be replaced at the same time or the repair will fail very quickly.

This connector like many that will be found was melted to the resistor and every wire had to be replaced. You can save yourself time and money by always being aware of changes in your vehicle and repairing them as soon as possible. If you need quality parts click here.

I recently completed a video on this repair as well. Please click here to view.

I am adding testing instructions due to popular demand. Testing is as follows. Disconnect the 7 wire harness connector and inspect.

If there is any sign of heat damage replace both parts per above instructions. If there is no sign of heat damage then check the following. With the 7 wire harness disconnected check for power on the red wire.

It should have 12 volts at all times and it gets it’s power from the 40 amp blower fuse in the under hood fuse box. Next with the key on check for 12 volt power to each of the following wires as you move the blower speed switch from low to high. Yellow / low, tan / med 1, lt blue / med 2, purple / med 3 and orange / high.

Remember, this test is done with the key on and the seven wire harness disconnected . Other than the red wire having power at all times, only one wire at a time will have power on it, during a proper test. If there is no power to any of these wires during the test. check the fuse in the driver’s interior fuse box. If only some of these signals are missing, you will need to inspect the blower speed switch and related wiring.

Also you should do a drag test on the terminals to check the spring tension. Please click here for more instructions

Terminal A Tan = Speed 2, power through blower switch from HVAC fuse

Chevrolet Silverado

Terminal B Yellow = Speed 1, power through blower switch from HVAC fuse

Terminal C Purple = Speed 4, power through blower switch from HVAC fuse

Terminal D Lt Blue = Speed 3, power through blower switch from HVAC fuse

Terminal E Black = Blower system, ground at all times

Terminal F Orange = Speed 5, power through blower switch from HVAC fuse

Terminal G Red = Speed 5, Constant power from BLWR fuse under hood

If for some reason the blower does not work at all and there is no power on any of the wires except the red. you may want to see the recent information I published about a new problem that has occurred. Please click here to see that article.

Chevrolet Silverado
Chevrolet Silverado
Chevrolet Silverado
Chevrolet Silverado

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