No Heat

ncsutj

ncsutj

Well-Known Member
Joined
Mar 20, 2005
Location
Concord
Wife drove my truck this morning and called me and said that there was no heat. Was just blowing cold air. I haven't gotten home yet to look at it but what are some things I should look for/check?

2013 Chevy Silverado with 5.3

75k miles. No obvious leaks. Was parked in the garage last night and she said she didn't see anything when she got home. I haven't done any coolant service or anything recently.

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Sort of sounds like a blend door or heater control valve issue but that's just my generic guess. Not familiar enough with the newer Chevy's.
 
If its full of antifreeze and both heater hoses are hot its most likely the blend door motor. If it has single zone temp its on the bottom of the dash above transmission tunnel, not too bad to do. If it has dual zone heat one side is still there the other is directly above it on the top of the heater box and that one you jave to halfway disassemble the dash. I cant remember which one is driver and which is passenger.

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It's dual climate control

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Only thing I found was the coolant level was a little below the cold full mark. I drove it to get a bottle of coolant and had heat before I pulled out of the driveway. While driving I changed the settings back and forth and it did what it was supposed to do. Not sure if it was a fluke or my wife doesn't know how to work the heat after having the truck for 5 years. Maybe an air bubble?
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ncsutj said:
Not sure if it was a fluke or my wife doesn't know how to work the heat after having the truck for 5 years.
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Axe her what the temp was set to? Was the fan on? Was the system on? I've done that before with my digital system: turn the temp all the way down to 60, and it shows it on the screen, but if you don't turn the fan on or select which vents to blow air out of, you just sit there like a sweaty moron cussing at the truck.
 
ncsutj said:
my wife doesn't know how to work the heat after having the truck for 5 years.
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I've got a smart cookie at home. She's got a pretty swanky title at work, and handles US and EURO divisions. 100's of people. But simply cannot figure out the thermostatic controls on her car either.
 
She said "It was blasting cold air". So it was on and fan was blowing.

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ncsutj said:
She said "It was blasting cold air". So it was on and fan was blowing.

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Sounds like a blend door motor then. Ive seen them crap out then work again later. Next time it does it see if the passenger side is same temp, if so its not a blend door, but if they're different temps, one hot the other cold the blend door that doesn't change has a bad motor. We see it at work a lot. My dads tow rig/dd is an 06 and his driver side went full hot one summer so he had to drive from Raleigh home to Fayetteville with no AC. Thats when it happens, when its most inconvenient it seems.

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Tim C said:
Sounds like a blend door motor then. Ive seen them crap out then work again later. Next time it does it see if the passenger side is same temp, if so its not a blend door, but if they're different temps, one hot the other cold the blend door that doesn't change has a bad motor. We see it at work a lot. My dads tow rig/dd is an 06 and his driver side went full hot one summer so he had to drive from Raleigh home to Fayetteville with no AC. Thats when it happens, when its most inconvenient it seems.

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This is what I'm leaning towards.

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Tim C said:
Sounds like a blend door motor then. Ive seen them crap out then work again later. Next time it does it see if the passenger side is same temp, if so its not a blend door, but if they're different temps, one hot the other cold the blend door that doesn't change has a bad motor. We see it at work a lot. My dads tow rig/dd is an 06 and his driver side went full hot one summer so he had to drive from Raleigh home to Fayetteville with no AC. Thats when it happens, when its most inconvenient it seems.

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My dad's 04 used to do that. It would reset and work for a while after a key cycle. It started out doing it once a week, it eventually would do it multiple times in an hour drive. He got too good at bumping it it to neutral, switching off and back on, back in drive while running down the highway. Eventually got the blend door motor replaced.
 
It doesnt have to be the blend door motor.
GM had a major issue with "blend door synchronization" across all platforms.

Former employer had 1,100 Impalas across the country. Fleet manager sent out a bulletin on how to force reset it without going into a dealer. I wish I could rememeber it but it involved turning the system off. Then cutting the car off. Then cyclicng the ignition switch and then setting the HVAC controls to a specific setting and cycling the ignition again. Youd get some "now syncing" message in the instrument cluster and viola. All was well....for a month, week, or hour.
 
Ron said:
It doesnt have to be the blend door motor.
GM had a major issue with "blend door synchronization" across all platforms.

Former employer had 1,100 Impalas across the country. Fleet manager sent out a bulletin on how to force reset it without going into a dealer. I wish I could rememeber it but it involved turning the system off. Then cutting the car off. Then cyclicng the ignition switch and then setting the HVAC controls to a specific setting and cycling the ignition again. Youd get some "now syncing" message in the instrument cluster and viola. All was well....for a month, week, or hour.
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My wife use to have an impala for a work car a couple years ago and it got to where it didn't have heat. The shop we took it too said it was a coolant level issue but I think they were full of shit. I think it was more of what your describing.

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