My heat won't work plz help?

Asked by Patricia Dec 19, 2016 at 04:56 PM about the 1991 GMC Sierra 1500

Question type: Maintenance & Repair

My heat worked fine until one day I turned
it up & the arrow thst moves from hot to
cold started flashing & no heat since & last
night the display screen turned black then
back on a couple times I replaced
thermostat and coolant neither helped :(
it's too cold to go anywhere & dangerous ;(
someone pls help

1 Answer

check the red power wire at the pigtail connector going into the blower relays behind the glove box -should be 3 relays, and you want to look at the one in the middle. I had same issue and found the red wire had burnt off.

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