HVAC fan speed question

[Monstar_est87]

This much be a common issue during the summer... I lost my first 2 low speeds... :-(
Sum1 please help... Is it my resistors to..?

 

[SunlitComet]

follow my instructions as above but for your speed loss probe the tan & yellow wires in back of switch.

 

[Monstar_est87]

Awsum... Ill get back 2 u with results...

 

[billowred]

What does this seem to be? I lost fan speed #3, I have all others. Resistor, relay or switch? The fan and resistor is two or so years old, but as we all know things fail. before I start ripping things apart I like to have a plan or a possible part to chase.

That's crazy I've been having this problem for 2 months now and it's driving me nuts!

 

[_Dylan_]

Check the resistor for breaks in the wire.

My old dodge got a bug stuck on the resistor and cracked the wire. No more low speeds. Parts stores didn't have the part so I put a crimp connector on the wire and it worked again.

 

[bowtiefreak]

Resistor in fine. Checked the voltage at the switch and nothing. To make it better I broke the mounting tab off the HVAC assembly, then broke all the tabs that hold the switch in place so not I need a whole assembly. Sucks, but old plastic is so brittle. Barely touched it and snapped them.

So off to find the whole assembly.

Attn Sun: is this right, looks right but you seem to have some top secret book of part numbers and info.

http://www.1aauto.com/1A/HeatingandACControls/Chevy/Tahoe/1AHCX00046/343000/1997

 

[SunlitComet]

it is right but you can do better:
www.amazon.com/ACDelco-15-72547-Heater-Control-Unit/dp/B000C9GYOA/

don't ever give up trying.

 

[bowtiefreak]

Ebay, found one for $99. My link was just one of the first things I found. As always, thank you for the help.

 

[billowred]

So was the problem within the fan knob?

 

[bowtiefreak]

Well, the switch behind the knob yes. I ended up with a whole assembly off ebay for $99. The plastic on the original was so brittle is was just falling apart in my hands. Works fine now