I have checked the blower fuse under the hood and it was fine but pulled the fuse out and checked the voltage across the fuse. It was zero. The blower resistor was replaced and had no effect. Can the fault be a loose wire at the fuse box?
I looked at 05 avalanche 1500--automatic hvac. The blower fuse is hot all the time. The fuse has an input leg and output leg, even if the fuse is blown, the input leg would still have voltage. If no voltage, you could use jumper wire connected to voltage on the output side of fuse cavity to see if blower would work. If you use jumper, use an inline fuse.
Yes, it could be something wrong with fuse box or wiring circuit?
Testimonial: "Thanks for the help. I did as you suggested and it eliminated a poor connection at the fuse. Turned out to be a loose connection at the 7 pin connector going into the blower resistor."
Glad you got it going your way.
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Most likely a relay, settings 1-4 go through the resistor, but when you turn it on full the relay switches and it should bypass the resistor completely, so if 1-4 are working and full is not, the relay is not switching, try swapping it out with another one of the same type from the relay box
There are two blower motor fuses. HTR/AC fuse 30A located in the instrument panel fuse box to power speeds 1-3 and Blower fuse 40A in the underhood fuse box for high speed.
If the HTR/AC fuse is good you've got a bad blower motor resistor
Blower motor only works on high speed
Blower motor only works on high speed
If the blower motor resistor fails...
SOURCE: 1998 Astro Van Heater AC Blower only works on medium & Low
Yes, in high it bypasses the resistor and uses a high blower relay. But I think on 1998 Astro the High relay and the resistor are built together. It should be mounted in the blower box real close to the blower motor.
SOURCE: heater only works on the 5th setting
I hat the same problem last week it was the blower motor resistor. Picked one up at Auto Zone but they are tricky to replace since it is on the passanger side up against the fire-wall.
SOURCE: Blower on my 2004 Chev Colorado only works on high setting #4.
You need a resistor pack, which is likely located in the air box, near the blower motor.
SOURCE: The fan/blower only works on the high setting.
It probably is the fan switch itself. They are around $30. for a new one. You can take it out and check to see if you have power to all the settings with a ohm meter or test light. They are not real hard to take out.
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