In an attempt to avoid any further confusion I am giving some detailed information on the blower resistors for the Chevrolet Avalanche, Silverado, Tahoe and Suburban, GMC Denali, Sierra, Suburban and Yukon and Cadillac Escalade and midsized Buick Rainier, Chevrolet Trailblazer and SSR (2004+2005), GMC Envoy, Isuzu Ascender and Olsmobile Bravada.
First of all the 15-81772 (formerly the 15-81095) resistor and resistor combo only fit Chevrolet Trailblazers and 2004+2005 SSR, GMC Envoys, Isuzu Acsender and Oldsmobile Bravada with manual a/c controls. The vehicles with auto a/c controls use a blower speed controller that only has three wires in the female connector on the unit. To see diagnostic and repair information on a blower speed controller please click here.
An interior view of a 15-81772.
An exterior view of the 15-81772.
The 15-81772 resistor for Trailblazers and Envoys with 4180 Repair Harness Combo.
The full sized Chevrolet, GMC and Cadillac trucks and SUV’s with manual a/c controls use one of two resistors. The 15-81086 is the most popular by far but a few vehicle details are important. RPO Code CJ3 or C42 ( manual a/c controls) and without RPO D07 ( Factory Floor Mounted Center Console). It is also important to note that a few vehicles do not go by these codes and therefore we strongly recommend a visual inspection of your part. The 15-81086 has a total of four mounting holes in the end tabs. The original design may have used a two part assembly.
The interior view of the 15-81086 resistor.
The exterior view of the 15-81086 resistor.
The full sized Chevrolet, GMC and Cadillac truck Blower resistor and repair harness combo with the 15-81086 resistor.
The 15-81087 resistor is used in full sized trucks and SUV’s with RPO Codes CJ3 (manual a/c controls) and with RPO Code D07 (Factory Floor Mounted Center Console). Again there are a few vehicles that this is not accurate on and a visual inspection is recommended. The 15-81087 is distinguished by only having a total of two mounting holes, one in each of the two end tabs as shown in the following pictures.
The interior view of the 15-81087 resistor.
The exterior view of the 15-81087.
The full sized Chevrolet, GMC and Cadillac truck Blower resistor and repair harness combo with 15-81087 resistor.
When ordering be sure to leave as much information as possible about your vehicle in the customer comment box at check out.
Insight? There is a test for every wire in the front blower system of your vehicle in the three repair post links that I gave you back on Aug 1, 2011. Since you have tested the fuses and blower motor. You stated they are okay, read the repairs and then go to the blower motor and see which signal is missing power or ground. Backtrack from that missing signal until you find the problem on your truck. Keep in mind that testing should be done initially with all circuits connected, the key on and the blower switch set to high.
Yes, is been a month, and I’m still trying to figure out why the blower on my 99 Suburban 2500 7.4L doesn’t work.
Thought I might get some insight here.
A month between questions? Your truck does not have the seven wire connector or the resistors related to it. What exactly do you need to know?