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Thought this was odd.

This is a discussion on Thought this was odd. within the General Help forums, part of the LSx Technical Help Section category; Ive noticed over the past several months that a blower fan kicks on and off in my 99 TA even ...

  1. #1
    Member wicked1's Avatar
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    1999 Trans Am

    Thought this was odd.

    Ive noticed over the past several months that a blower fan kicks on and off in my 99 TA even when the car hasnt moved for days. At first I thought it was the cooling fan but I sat and waited for it one day while washing her and I discovered its the heater/air conditioning fan thats up in the dash. It comes on for 2-3 seconds and goes off. As I said this is even when the car hasnt been moved. I first noticed it last winter when it was parked in the garage. Has anyone else experienced this? Anyone know what could be wrong?

  2. #2
    Yeah baby! Yeah! silverWS6's Avatar
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    Silver 2002 WS.6
    Red 1989 Formula

    Keeps it from stinking up inside? That is weird, idk if mine does it hmmmm
    Does it kill your battery?

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    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
    98' trans am

    something funky with your hvac system i would guess

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    Member wicked1's Avatar
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    My battery did die this spring but it was old so I dont know if that killed it or not. Since I put the new battery in its been fine. Couple months now.

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    Senior Member JaycenK's Avatar
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    Sounds like something wrong if it dosen't stay on for longer than that. Some people wire up a thermo to a relay to vent the car of heat. could be a bad ground but I don't have a wire diagram to look at how the circuits are designed.

  6. #6
    Member wicked1's Avatar
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    I think my car has an electronic evaporator on it. I found out you install these to help keep the ac dry so it doesnt grow mold and stink. Itll cause the blower to come on.

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    Yeah its called an afterblow module. I've installed a few of these. It runs the blower like you described to dry out the heater/evap case to prevent the musty odors caused by mold/mildew.

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