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Old 03-07-2018, 07:02 PM   #1
Palf70Step
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Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,613
Help with Heat/AC

The system seems to work OK, but the issue I am having is that when I turn off the ignition switch, the fan continues to run unless I manually move the switch from AC to OFF.

I have traced out all the wiring and it appears good. Not hacked from what I can see. I have never known a truck to have the fan work with the key in the off position.

Any of you got ideas on what to check on?
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Old 03-07-2018, 10:30 PM   #2
Goats86
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Location: Waxahachie, Texas
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Re: Help with Heat/AC

Might be the blower relay. If I remember correctly, it has full time 12 volts and the fan speed is regulated thru the ground at the switch.
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