Fan switch and connector plug

[Dihrdbowti]

Ok so I had an issue with the fan switch losing one setting then another then another until the switch no longer worked. I went to the stealer and got a new switch. I replaced it and while replacing it I noticed that the plug looked like it had melted at one of the pins. It wasn't too bad and the pins were still separated so I plugged it back in. Everything seemed to be working for about two weeks. The switch lost one of the low settings then the whole thing died again.. I am just getting ready to go look but if anyone has any ideas on what I should be looking for I would appreciate the help.

Thank you

[kaylabryn]

I would check to make sure that your actual fan is not pulling to much current. Mine was getting the wires hot and finally took out my resistor pack from pulling so much current. My fan sounded fine and put out good amount of air, but when I pulled the fan it was very hard to turn by hand. Replaced with one from Checkers and all is good, also had to get a new resitor pack from the dealer

[Dihrdbowti]

Didn't even think about that.. I'll have to check it out..

[Dihrdbowti]

Ok so I replaced the blower motor for the hell of it. The old one didn't seem too bad. It turned about as easy as the new one. I also had to replace the switch and connector. See pics below. It looks like the light blue or A on the connector and the dark brown or H on the connector. I don't have my schematics so I can't look up the circuit. Can anyone tell me what the circuit is or why this might happen? This is on my Yukon.

Thanks

[Robyn]

Hello

Those connectors are sure nasty looking.

Definately too much heat there.

What probably happened is a "brown out" due to a poor connection.
The little pins on the switch and the mating parts on the plug get dirty and the amperage starts to go up and then if it arcs a little bit then carbon forms on the connection and the amperage goes up more until it just simply cany handle it and melts.

Look tha harness over good and see if there are any other issues with the wires. If there are no other problems with the wiring then simply splice in a new plug and install a new switch and your good to go.

The plug that goes into the switch will be available as a "PIG TAIL" from Ma General for a few $$$ and will no doubt come with butt splice connectors.

A little dialectric grease on the new switch pins will aid in keeping this from happening again.

Make sure your resistors are good too as has been mentioned

[Dihrdbowti]

Can you tell me where exactly the resistors are?

[TurboDiverArt]

Not to hijack the thread but it's related.

I have a 1999 Suburban. My heater/AC blower fan is squealing. How hard was it for you guys to swap out? Do I need to remove any of the dash? It looks like I can get to it fairly easily from the passenger side seat but I didn't want to start the project and not be able to complete it. I didn’t look too closely but my assumption is that the round metal cylinder I can see is actually the back of the fan motor or is it a cover that needs to be removed to get access to the motor? Looking at your wires I now really want to swap mine out.

Thanks for any info!!