1995 Chevy S-10 Defrost fan isn't working

1995 CHEVROLET S-10
105,000 MILES • 4 CYL • 2WD • MANUAL
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LITTLEBLUETRUCK
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  • 2 POSTS
Of course, it's the dead of winter and the defroster quit. Heat is still coming out, but the fan won't start. It worked on the way to work in the morning, but didn't in the evening.

Frankly, I haven't done more than check fluids, tire pressure and change oil, so I'm pretty much a novice when it comes to verifying if the fan is blown or a switch.
Jan 22, 2008 at 2:42 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Let start by checking HTR/AC fuse no.6 25amp at instrument panel fuse block. If its okay find blower motor relay at right rear of engine compartment-either swap it for a look alike or test it. If the fuse and relay is okay-the problem is the HVAC control assembly


https://images.2carpros.com/forum/automotive_pictures/12900_hvac_1.jpg

Jan 22, 2008 at 9:37 PM
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LITTLEBLUETRUCK
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I did check on the fuses and made sure the connection was tight last night. Based on your description of the relay, that's what I disconnected, examined the plug and re-connected. All looked ok from what little I could see. Still wasn't working last night.

This morning, I turned it on again and it actually was blowing air! It wasn't doing anything in the lowest fan setting, but 2nd-highest did. It seems like it's not working at full force, though, like the "1" setting is now at the "2" position, if that makes sense.

Does this narrow it to just the relay switch? Or, have I still missed something?
Jan 23, 2008 at 4:18 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Replace the blower motor resistor
Jan 23, 2008 at 5:41 AM
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