Re: Ac/heater fan only blows on low and medium speeds.
There are a couple of things I would check right off. One is the switch in the dash selector. There is a lot of current that goes through that switch and they can burn the contacts or terminals out. The other is the ballast resistor located on the HVAC housing under the glove box. They can burn out too.
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
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