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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: 74OrangeCrush on August 03, 2010, 11:53:11 pm

Title: heater
Post by: 74OrangeCrush on August 03, 2010, 11:53:11 pm

I have a 74 stepside and can not get it to stop blowing hot air out, all of the cables are free and move properly is there something that could be stuck that I am missing?

Title: Re: heater
Post by: beastie_3 on August 04, 2010, 01:12:39 am

A door could be stuck open. The fan will always be on, so you will always have airflow. Think about dropping your inner box and cleaning it out. Its fairly easy. Might be a good time to swap out the heater core anyways. Its cheap, so its worth doing in the process.

Title: Re: heater
Post by: 1980c10 on August 05, 2010, 11:30:34 pm

I have the same problem with mine. I'm actually considering putting in some inline valves on the heater hoses so I can shut them off on the hot days and open them up when I might want the heat.

Title: Re: heater
Post by: Swims350 on August 06, 2010, 09:54:15 am

yea alot of gm's the fan keeps running I think I'd wire the sucker to a seperate inline switch before the regular switch or resistor whichever is needed to cut power and keep it from running until you flip that switch then turn on the heater by the factory switch.

Title: Re: heater
Post by: 74OrangeCrush on August 06, 2010, 08:10:32 pm

Quote from: 74OrangeCrush on August 03, 2010, 11:53:11 pm

I have a 74 stepside and can not get it to stop blowing hot air out, all of the cables are free and move properly is there something that could be stuck that I am missing?

Im with you beastie I live in Missouri and the last couple of days the heat index has been around 100-105 luckily it is a short drive to work

Title: Re: heater
Post by: Irish_Alley on August 06, 2010, 11:12:34 pm

I unplugged my fan from under the Hood but due to vents its not a breeze of hot air but just hot air that u still feel

Title: Re: heater
Post by: 1980c10 on August 08, 2010, 11:24:52 pm

thanks irish. I will try that. I don't know why it didn't cross my mind to just unplug it for the summer since mine is a non a/c truck.

Title: Re: heater
Post by: SeanK10 on August 09, 2010, 07:41:00 pm

Quote from: 1980c10 on August 08, 2010, 11:24:52 pm

thanks irish. I will try that. I don't know why it didn't cross my mind to just unplug it for the summer since mine is a non a/c truck.

I had to do the Same thing haha,,it was a easy fix and Definately worth it

Title: Re: heater
Post by: bobcooter on August 12, 2010, 03:38:24 pm

Quote from: 1980c10 on August 05, 2010, 11:30:34 pm

I have the same problem with mine. I'm actually considering putting in some inline valves on the heater hoses so I can shut them off on the hot days and open them up when I might want the heat.

I've done that before. Works pretty well. I would open them every so often to circulate the water and coolant.

Title: Re: heater
Post by: howlinwolf on August 12, 2010, 08:25:34 pm

only need 1

Title: Re: heater
Post by: bobcooter on August 13, 2010, 02:26:39 pm

That's what I did. Put a valve in the line going to the heater.

Title: Re: heater
Post by: Captkaos on August 16, 2010, 05:45:30 pm

The fan running constantly was a "feature" on the trucks.