The number four and five station on heater went out at same time

2005 CHEVROLET TRAILBLAZER
145,000 MILES • 6 CYL • 4WD • AUTOMATIC
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VSPARKS
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  • 1 POST
The Number four and five heater settings went out at same time. What would cause this? Have already replace fuse for blower.
Dec 6, 2016 at 1:16 AM
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HMAC300
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  • 48,601 POSTS
check blower relay under hood and for lower speeds resistor by blower.
Dec 6, 2016 at 7:08 AM