High speed uses a separate fuse. It's in the fuse box under the hood, large green 30 amp. If the fuse is not blown, suspect the blower resistor assembly at the front of the ac/heater box, just behind the washer bottle. Occassionally the fan switch itself may be defective.
The Blower motor is under the hood, passenger side. It has a purple wire attached.
It is located behind the coolant and windshield washer reservoirs. The two wires on the blower motor will lead you to it.
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The high speed relay for the blower motor would be found under the hood, on the passenger side of the firewall, close to the blower motor speed resistor.
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Is anyone on line to help me with this question? Where is the fast idle thermal valve in a 1997 Chevy astro van located?
Astro 4WD Base: 29.370$ Astro 4WD LS: 31.895$ Astro 4WD LT: 34.600$
Right next to the blower motor
it possible is the blower motor is going bad or the blower motor squirl cage is rubbing Most likely there is debri in the blower motor cage, usually mice get in there.