I have a 1998 GMC Sonoma that has no heat and the blower mower hums. I have changed the relay switch and the resister. Also the third brake light comes on the the heat setting is on 3.

Asked by Feb 16, 2014 at 05:51 PM about the 1998 GMC Sonoma 2 Dr SLS Sport Standard Cab LB

Question type: Maintenance & Repair

2 Answers

63,085

Sounds like the blower motor is bad. Since it hums we know it's getting power. I'd replace the blower motor. As for the 3rd brake light, that's a new one on me. I'd have to say someone wired it in to get it to work. Just so happens they picked the wire for speed 3 on the blower switch. HTH. -Jim

The blower motor is good, the relay and resister are both new. The humming comes out of the relay on speed 1,2, and 3 the only thing that occurs on speed 4 is the 3rd brake light comes on.

Your Answer

Add photo

Related Questions

Search GMC Sonoma Questions

GMC Sonoma Experts

#1 parkle
parkle
Reputation 650
#2 Mike Bonnell
Mike Bonnell
Reputation 430
#3 James Mayfield
James Mayfield
Reputation 310
View All

Related Models For Sale

Used Chevrolet S-10
6 Great Deals out of 1,428 listings starting at $1,995
Used Ford Ranger
178 Great Deals out of 6,228 listings starting at $1,300
Used GMC Sierra 1500
879 Great Deals out of 64,789 listings starting at $1,500
Used Chevrolet Silverado 1500
2,013 Great Deals out of 160,759 listings starting at $1,995
Used Ford F-150
2,426 Great Deals out of 211,450 listings starting at $895
Used Toyota Tacoma
549 Great Deals out of 38,152 listings starting at $2,900
Used Dodge Dakota
110 Great Deals out of 3,926 listings starting at $1,500
Used Dodge Ram 1500
453 Great Deals out of 11,501 listings starting at $700
Used Nissan Frontier
392 Great Deals out of 26,170 listings starting at $890
Used Chevrolet Blazer
1,125 listings starting at $1,995
Used Chevrolet C/K 1500
874 listings starting at $2,943
Used GMC Jimmy
228 listings starting at $2,295

Used Cars For Sale

2003 GMC Sonoma For Sale
4 Great Deals out of 110 listings starting at $2,798
2002 GMC Sonoma For Sale
80 listings starting at $2,700
2001 GMC Sonoma For Sale
57 listings starting at $3,995
1999 GMC Sonoma For Sale
34 listings starting at $3,995