[boothboy]

So a friend of mine called up yesterday asking about a problem on a 1998 Chevy Tahoe he's buying. Over it 88K career it's had five blower switches replaced. I'm gonna end up fixing it for him and will check out the blower motor for excessive draw and burnt connections and connectors. Anybody run into this problem before? Any recalls from Chevy? Five switches is pretty unusual at best! It does not have automatic air.
BB

[S10 Racer]

Could'nt find any recalls or TSB's for that problem. There has to be another issue besides the switch, something is burning out the switches. You may need to replace the blower motor resistor, check the wiring for melted wires and check and make sure all connections are good and not corroded.

[302 Z28]

Either blower motor as you have suggested or corroded/burned plug conectors. Ford had this problem in the late seventies.

Vince

[poncho62]

Just replaced the switch in my daughters GM minivan.....The switch was melted......I think there is a lot of draw in those blower motors.

[boothboy]

All of you guys are thinking the same way as I am. In the past one of both Ford and GM problems was that neither one used enough metal in their connectors. Lots of plastic , little metal. Thanks for checking.
BB

[vicrod]

Another thing could be the high speed relay. This relay shunts the resistors and all of the blower motor load so the switch does not get overloaded in high speed.
Put an ammeter on the thing to see what is causing the high current.
This circuit is fused at 50 amps.

vicrod