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Old 11-13-2015, 11:20 AM   #1
RB72
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Steam blowing in cab

I just got my heater core changed and now im having steam blowing into my vents. Anyone have any idea what that could be? thanks
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Old 11-13-2015, 11:23 AM   #2
Boog
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Re: Steam blowing in cab

Its probably a damaged New heater core.
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Old 11-13-2015, 11:55 AM   #3
EARNHARDT#3
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Re: Steam blowing in cab

You may have punctured the new heater core with the screws that hold the brackets in the box.
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Old 11-13-2015, 12:19 PM   #4
GASoline71
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Re: Steam blowing in cab

Either that or one of the hoses is leaking and its getting inside the heater box.

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Old 11-13-2015, 12:26 PM   #5
truckster
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Re: Steam blowing in cab

I don't think it's likely to be hoses or clamps, since those are on the other side of the firewall. Of course, if the foam insulation between the core and the firewall is missing, it's possible steam could get in there. It can't hurt to check to make sure the clamps are tight.

Best case scenario would be a factory-defective heater core (it happens). But as the others stated, it's also very possible you damaged it during the installation. I would remove it very carefully, so that if it is a factory defect you can have the part house replace it.
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Old 11-13-2015, 12:40 PM   #6
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Re: Steam blowing in cab

I would think its the heater core,had it happen before,
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Old 11-13-2015, 01:34 PM   #7
GASoline71
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Re: Steam blowing in cab

Had a upper heater hose leak at the clamp at the heater core in a '67 C10 and coolant seeped into the box over the core... nice and foggy windows.

Gary
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My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread.

The Rebuild of Creeping Death after the wreck

Quote:
Originally Posted by LONGHAIR View Post
I would never rebuild a 305.
Quote:
Originally Posted by prostreetC-10 View Post
I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
Quote:
Originally Posted by Marv D View Post
Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
Quote:
Originally Posted by cableguy0 View Post
Its cheaper to listen to advice given when you ask for help than it is to ignore everyone and wait for carnage.
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Old 11-15-2015, 11:54 PM   #8
RB72
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Re: Steam blowing in cab

It was indeed a bad heater core! Thanks guys!
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Old 11-16-2015, 12:08 AM   #9
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Re: Steam blowing in cab

I'm sure that was something you didn't wanna do twice.
Had that happen on a 1st Gen s10 once. Not fun.
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