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Author Topic: Fan for heater never turns off.  (Read 3149 times)

Offline ian75c10

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Fan for heater never turns off.
« on: October 27, 2013, 11:45:20 am »
If the key is on then theres always a fan sound from the heater. Why? How to fix?
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Offline zieg85

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Re: Fan for heater never turns off.
« Reply #1 on: October 27, 2013, 12:41:39 pm »
If it is an AC equipped truck it is by design that it stays on all the time
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Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline bd

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Re: Fan for heater never turns off.
« Reply #2 on: October 27, 2013, 12:54:58 pm »
As zieg85 posted, the A/C ventilation system is designed to blow on low speed whenever the ignition is switched on and the heater/AC are switched off.  This dries the plenum to help reduce mildew formation while decreasing dust accumulation and maintaining fresh cabin air.
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline BSR63

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Re: Fan for heater never turns off.
« Reply #3 on: November 13, 2013, 06:38:20 pm »
AHHH HAAA!  Thanks for the answer. I had heard that they just crap out and stay on after awhile.
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