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Old 10-01-2007, 01:41 PM   #1
72 cheyenne pdx
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steam coming out of the heater vents

Hello All,
I went camping over the weekend, and hadn't started up my truck in a few months. It started right up and after giving her a few minutes of running, I kicked on the heater. I started on my trip and about 5 minutes going down the road, white smoke started pouring out of the defrost vents as well as the heater vents. I pulled over and inspected the enigine compartment, but no smoke in there. I started the truck again and the smoke came back. I put my hand over a vent and realized it was condesation, so figured it was water. It didn't smell like burnt wires/oil/or coolant. After about 15-20 minutes the smoke/steam disappeared and everything seemed fine. My question is, do you think water is getting into the heater hoses? I checked the radiator the next morning and it was full, so I don't think it is coming from there. Any suggestions on where it may be coming from?

Thanks for all the help.

SEA
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Old 10-01-2007, 01:49 PM   #2
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Re: steam coming out of the heater vents

maybe a small crack or something in the heater core.
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Old 10-01-2007, 02:00 PM   #3
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Re: steam coming out of the heater vents

Mice built a nest in your heater core???

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Old 10-01-2007, 02:07 PM   #4
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Re: steam coming out of the heater vents

I'm watching this one intently - my 90 Mustang does the same thing, but only in the mornings, and I don't use the heater. Mine does something else special too - I get a burning smell with slower fan speeds. I need to pull the resistor pack out and see if I've got a mouse or big roach slow-roasting there.

I also thought about a cracked heater core, but I never have a wet carpet and the fluid level is always good. The vapor does smell coolanty though.

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Old 10-01-2007, 02:43 PM   #5
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Re: steam coming out of the heater vents

Quote:
Originally Posted by 724x4a/cchevy View Post
maybe a small crack or something in the heater core.
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Old 10-01-2007, 03:04 PM   #6
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Re: steam coming out of the heater vents

time to replace the heater core
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Old 10-01-2007, 05:16 PM   #7
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Re: steam coming out of the heater vents

heater core my 8 7 f-150 did this and finally it went out all the way with steam out the dash
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Old 10-01-2007, 06:24 PM   #8
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Re: steam coming out of the heater vents

I was hoping it wasn't the heater core, but it doesn't sound like I am going to be lucky. I will check the hoses first to see if they are cracked. Thanks for all the responses. It is much appreciated.

SEA

Last edited by 72 cheyenne pdx; 10-01-2007 at 06:24 PM.
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Old 10-01-2007, 09:59 PM   #9
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Re: steam coming out of the heater vents

hate to dogpile, but that is a heater core gone south for sure. not as hard to replace as newer vehicles though..... just a bit messy.

Last edited by tcb-1; 10-01-2007 at 09:59 PM.
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Old 10-02-2007, 04:15 AM   #10
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Re: steam coming out of the heater vents

GMC Pauls sells a correct Heater Core which fits better than the ones you get at the local parts stores, if it is the heater cor.e
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Old 10-02-2007, 06:02 AM   #11
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Re: steam coming out of the heater vents

Heater core,for sure.
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Old 10-02-2007, 04:36 PM   #12
72 cheyenne pdx
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Re: steam coming out of the heater vents

Well I checked my hoses last night and the hoses look real good. A little too good so I called my FIL, who knows the history of this truck, and the heater hoses were replaced about a year before I inherited the truck (2 years ago). So the verdict is out, it must be the heater core.

Thanks Again for all the responses. It sounds like I am going to be replacing the heater core real soon. (Before the fall/winter Salmon/Steelhead runs hit.)

SEA
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Old 11-08-2018, 09:14 PM   #13
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Re: steam coming out of the heater vents

Wouldn't cruise further than you can push it back. Sometimes a small leak opens up really fast and then you'll have coolant all over the floor.
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Old 11-08-2018, 10:03 PM   #14
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Re: steam coming out of the heater vents

Well, he's had 11 years to replace the heater core, so he's probably okay.
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Old 11-08-2018, 10:47 PM   #15
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Re: steam coming out of the heater vents

Quote:
Originally Posted by 72 cheyenne pdx View Post
I was hoping it wasn't the heater core, but it doesn't sound like I am going to be lucky. I will check the hoses first to see if they are cracked. Thanks for all the responses. It is much appreciated.

SEA
Heater core replacement on these trucks is pretty easy.
Have to losen pass hood hinge.
Search YouTube. Good vid on it there.
About a hour Job.
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Old 11-08-2018, 11:05 PM   #16
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Re: steam coming out of the heater vents

Quote:
Originally Posted by Stocker View Post
Well, he's had 11 years to replace the heater core, so he's probably okay.
LOL!!!!!
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