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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: ian75c10 on October 27, 2013, 11:45:20 am

Title: Fan for heater never turns off.
Post by: ian75c10 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?

Title: Re: Fan for heater never turns off.
Post by: zieg85 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

Title: Re: Fan for heater never turns off.
Post by: bd 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.

Title: Re: Fan for heater never turns off.
Post by: BSR63 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.