98 C1500 HAVC blower intermittent

[Sean Sills]

I had lost one of the lower fan speeds some time ago and all of a sudden none will work or it works intermittently. Even on high doesn't work and I don't hear the fan running. Does this sound like the fan motor or resistor or both?

 

[someotherguy]

Losing individual speeds is *almost* always resistor failure. Not always, though. It can also be the fan switch or its harness connections burning up. If it is the switch, it's replaceable individually without having to buy a whole new control head, btw. But yes, your first suspect there is the resistor.

Now what caused the resistor to go bad? Sometimes it's the blower motor going bad and drawing too much current. Now with your fan completely out I'd suspect the motor itself or the power/ground connections to it as they can get oxidized and crap out.

So start with a test light or better yet a multimeter, see what your readings are at the power/ground connections for the blower motor, with the fan setting on high, and let's go from there.

Richard

 

[Sean Sills]

I think I am going to replace the motor and resistor.

 

[Orpedcrow]

I think I am going to replace the motor and resistor.

Don’t be surprised if you have to replace a connector too. It’s probably melted and/or corroded like @someotherguy mentioned. I’ve seen both the fan and resistor plugs available in several places.

 

[Sean Sills]

Could someone show me on Amazon these connectors?

 

[Erik the Awful]

No need to replace what isn't broken. Troubleshoot it. The connector is right above the passenger's feet, and it's really common for the connector to get kicked off, or the connector broken, or the ground wire broken.

 

[Sean Sills]

I have light on the hot wire but no light on ground.

 

[Erik the Awful]

I have light on the hot wire but no light on ground.

You shouldn't have a light on the ground.

Your blower motor's kaput.

 

[Sean Sills]

Thank you

 

[Sean Sills]

I have replaced the blower motor and resistor but still no fan. Ideas?