Question about 1998 GMC Sierra
I checked heater motor it works fine. Replaced heater switch and checked voltage across fan fuse. Where is the relay located for the fan it doesn't appear to be with the other relays under the hood?
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Posted on Jan 02, 2017
you need to replace the fan ...its under the hood on the passenger side held in bt 3 screws and one plug this is the only motor on that side of the vehicle and only takes a half hour to change out
Posted on Jan 25, 2009
check the fan switch in the dash and the fan motor connector for burning, if u find burned connectors replace them and the heater blower switch.
Posted on Mar 08, 2010
SOURCE: i have a 99 gmc
I'm assuming that the blower isn't work in LOW, then with blower control speed at Low, you have no power supply to the yellow wire. Let ma know the following:
1. Do you have power at the Tan wire when blower speed is set at M1?
2. Do you have power at the Light Blue wire when blower speed is set st M2?
3. Does applying battery voltage to the terminal of the resistor at the yellow wire work the blower at low speed?
4. Did you test the HTR fuse ( 25A) in the fuse box?
If you have power on the brown wire coming from the heater 25amp fuse when key is On and when you switch to low the yellow wire should have power-Is this happening if not were right back with HVAC control module. Now if yellow has power ,blower motor should come On-if not-check and test the ground pointG201 at right side of dash.
Keep us uodated.
Posted on Nov 11, 2010
SOUND LIKE BAD BLOWER MOTOR RESISTOR.CHECK BLOWER MOTOR HI BLOW FUSE AND RELAY.YOU WILL NEED OWNERS MANUAL IN GLOVE COMPARTMENT TO LOCATED BLOWER MOTOR FUSES AND RELAYS.
Posted on Jun 06, 2011
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