The 1947 - Present Chevrolet & GMC Truck Message Board Network

The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)
-   The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=4)
-   -   Heater/defrost fan keeps running (https://67-72chevytrucks.com/vboard/showthread.php?t=605446)

CaliLivn 11-23-2013 03:39 PM

Heater/defrost fan keeps running
 
This is for my dads 74 pickup. It has 350, AC an everything. The other night when he got home he turned off his truck an the heater fan kept running. He started his truck real fast an shut it down an it still kept blowing air. He got nervous so he popped the hood an unscrewed the battery cable an it shut off. In the morning he reconnected the battery cable an it started blowing air right away. He tried starting his motor an shutting it off an removing the key an it stayed on.... Finally he pulled the heater fuse an it stopped. Has anyone had this happen before? I would like to try an fix it myself before taking it to a shop. Thank you

wilkin250r 11-23-2013 06:30 PM

Re: Heater/defrost fan keeps running
 
The fan is designed to run any time the ignition switch is on, the fan doesn't really have an "off" position. So my first suspect is the ignition switch is old and worn, and isn't turning off properly.

Do any of the other accessories work, like radio, lights, and other accessories that are also on when the key switch is on?

CaliLivn 11-23-2013 08:06 PM

Re: Heater/defrost fan keeps running
 
Quote:

Originally Posted by wilkin250r (Post 6384890)
The fan is designed to run any time the ignition switch is on, the fan doesn't really have an "off" position. So my first suspect is the ignition switch is old and worn, and isn't turning off properly.

Do any of the other accessories work, like radio, lights, and other accessories that are also on when the key switch is on?

That was my first thought. I had him go try the radio with the key removed an he said the radio didn't turn on. He even put the key in an turned other truck on an put the radio on kinda loud an leave it on as he turned off the truck an the radio **** off. He's gonna put the fuse back in tomorrow after church an see if it healed itself. Lol


All times are GMT -4. The time now is 01:17 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.
Copyright 1997-2025 67-72chevytrucks.com