[Bigdogdad1953]

Anyone know what the noise that sounds like a small fan motor or pump running is when I turn on my ignition only ac is off but this sound runs for like 5 sec then stops also does the same when I turn off truck

 

[Spomedome]

Did you ever figure this out? I’m having the same exact problem. It also happens when my truck is running and I turn my temperature knob. They’re two very distinct sounds. One when I turn the heat up, and one when I turn it cooler. Also, my heat doesn’t work. It blows cold A/C at all times

 

[Keifer724]

Ditto- Same issue. Had it for a month or so. Going to look into it this weekend. I've tried searching but couldn't phrase the question to where I could get a decent response.