98 Silverado K1500, Hi speed blower operation is intermittent. Lower speeds work fine. Can the problem be with the resistor pack if hi speed works occasionally, or is this a design that routes current through the resistor pack at hi speed as well? Should I rather be diagnosing the wiring harness?
Blower Hi Speed
Aug 26, 2006
3 Replies
Sounds like the fan switch. What happens if you wiggle the switch when it's on high?
Al
I noted a similar problem with my 94 Jimmy. With the fan switch in high, no fan. The relay on the firewall is/was the problem -- I tapped it and the fan came on high. Relays are cheap and easy to replace -- might want to explore that before going to the expensive stuff.
JJC
If I remember corecctly the resistor pack is for loW sppeds. The resistors are in sseries. The high speed should be connected directly to the battery most likely though a relay to the battery. This keeps the igintion switch current down to safe levels. The blower on High darws lots of current check all the connections to the relay. Joe
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