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Main suspect is the blower motor relay. What year, make and model of truck will tell you where the relay module is. I have an 86 s10 that does this also. I replaced the 30 year old relay module with a new one, and the new one does it once in a while also. Yes, I swapped the new one for free within the 30 day warranty, and guess what? The other other new one does it too. On my s10, the relay is on the firewall about 6 inches from the blower motor. When the thing won't quit, I pop the hood and tap on the relay to make it stop.
Right disconnect the battery and see if stops as i have had this problem before and the cause is a solar panel in the sun roof will cause this motor to run to keep the interior temperature down on a hot day .This had me well baffled last week with a AUDI A8 i spent a short while thinking what the noise was then when i found the noise was the blower motor i started to try to think of all the causes i think off then i looked for the fuse board when i thought disconnect the battery first --- and the noise still continued and it was hot over 30? C so i took my overhauls off and threw them over the roof getting ready to look for a second battery somewhere and the noise stopped ,removed the overhauls and it started again so look at the sun roof and it had a solar panel in the glass .BOY DID I FEEL LIKE A IDIOT