Have you checked the engine coolant level?
The coolant can be low enough to starve your heater core, but high enough to still keep the engine from over heating.
If the coolant bottle is empty, make sure you top off the radiator itself... well it's cooled off.
THIS HAPPENED TO ME. I WENT THROUGH TWO WINTERS IN A COLD TRUCK. IT'S WAS NOT BAD BECAUSE I LIVE IN HOUSTON,TX 60 DEGREE WINTERS. HAHA
IN THE CENTER CONSOLE NEAR THE PASSENGER THERE IS A LITTLE HARNESS (TO THE HEATER DOOR) IT COULD BE THAT SOMEONE UNPLUGGED IT WITH THEIR FEET WHEN SITTING IN THE MIDDLE (RIDING *****) =).
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Popular Solutions for 2000 Chevrolet Silverado 1500
My ABS sometimes the light is off and sometimes the light is on, I cleaned the sensor but still...
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My ABS sometimes the light is off and sometimes the light is on, I cleaned the sensor but still light on. Anybody know why ? Thank