HVAC Fan is eratic

[beav626]

it works and blows cold air but fan speed does not match what I choose on the Auto climate control unit.

If I put it to max fan speed I get very low air flow. If I put it in auto mode it shows full speed ion fan but the fan is putting out low speed.

Sometimes when I turn off the truck the fan keeps blowing.

is my blower motor going out, or my HVAC controls?

recently my blower motor was squeaking at me, so I took it out and lubed it. it is quiet but acting crazy.

 

[beav626]

Bump for Today

 

[beav626]

anybody?

 

[rv8tor]

I got exactly the same thing going on with my '05 Tahoe. Have you had any response anywhere else to this problem????

Jeff

 

[beav626]

I got exactly the same thing going on with my '05 Tahoe. Have you had any response anywhere else to this problem????

Jeff

yes- I replaced the resistor module next to the blower motor and everything worked great.

as long as you blower motor is working OK just not responding to controls I would replace the resistor module

its like $80 from partstaxi.com

HVAC Resistor module.

 

[rv8tor]

The resister module eh..? okay. Is it easy to get to?

Jeff

 

[Chucktown Mako]

Very easy. Under passenger side dash, on my '01 anyway. Remove long black cover, 3 screws, then you'll see it.
If it's different for your year, hope someone else chimes in.

 

[beav626]

my 03 EXT had 2 screws to remove the Sound insulator (Black plastic cover)

Then two screws held the resistor in place. I removed the blower motor to unplug the resistor. Blower motor just rotate out.

 

[rv8tor]

Thanks guys. I will give it a try and let you know how it goes..

Jeff

 

[rv8tor]

Okay, I replaced the module next to the fan, and now the fans blows. The only problem is that it blows on high 100% of the time, and the dash controls do not have any effect! What's even stranger is that even when I shut the engine down and take the keys out, the fan continues to blow. I have to unplug the power source from the car to the module to get it to stop so I don't run the battery down!

So what gives here? What am I missing?

Jeff