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Old 01-19-2012, 03:29 PM   #1
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Clogged heater core.

I've seen a few threads about inadequate heat in some TJ's, mine had a problem with low air temp. I checked the blend door as was suggested in some posts & it was working good. Pulled the heater hoses off & tried flushing with a garden hose, I barely got a trickle through it. I went to the local hose shop & bought some fittings to back flush it using air and water. Wow, what a difference! Looked like mud coming out for a while! Now I've got great heat!

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Here's a pic of the setup I used. Garden hose fitting at the top, blow gun on the right and 5/8 hose barb to hook to the heater hose. I used the blow gun so I could regulate the amount of air I was putting in (plus that's what I had handy!). Cost was about $15.

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Old 01-19-2012, 03:31 PM   #2
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Good thinking!

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Old 01-19-2012, 03:41 PM   #3
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Nice work. I'll have to keep that in mind.
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Old 01-19-2012, 05:03 PM   #4
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This is a very common problem on the GM 4.3 vortec motors... About 95% its a clogged heater core and I fix it the same way except i use a rag and blow gun works great! Just like poping a pimple
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Old 01-19-2012, 08:07 PM   #5
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Originally Posted by NewMoparGuy View Post
This is a very common problem on the GM 4.3 vortec motors... About 95% its a clogged heater core and I fix it the same way except i use a rag and blow gun works great!
Any insight as to why those engines produce that red mud like they do?
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Old 01-19-2012, 08:36 PM   #6
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Originally Posted by NewMoparGuy View Post
This is a very common problem on the GM 4.3 vortec motors... About 95% its a clogged heater core and I fix it the same way except i use a rag and blow gun works great! Just like poping a pimple
I've had to flush the heater core on my s10 blazer a few times.

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Any insight as to why those engines produce that red mud like they do?
It's the coolant and people not using distilled water.
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Old 01-19-2012, 11:57 PM   #7
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Any insight as to why those engines produce that red mud like they do?
Is the coolant red or orange? It is likely iron-oxide or better known as rust. If you are getting rust, it is likely the lack of sufficient corrosion inhibitors in the coolant, wrong coolant, wrong coolant spec, or low coolant levels. Distilled water is lot more corrosive then non-distilled water. However, if you use hard water, you will end-up with scale. Coolants are all designed to work with distilled water as far as I know.
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Old 01-20-2012, 12:01 AM   #8
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I have a continuing clogged heater problem. But after flushing it about once a month for 4 months it's getting. Better an better. Stuff comes out everytime. No clue where it's coming from.....
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Old 01-20-2012, 12:15 AM   #9
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It's the metal corroding. Make sure you are using the correct coolant and at the right concentration and only use distilled water.
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Old 01-20-2012, 12:18 AM   #10
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In addition to rust the red muck is produced by GM's Dexcool antifreeze its nasty stuff almost like a slimy after prolonged use..
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Old 01-20-2012, 12:23 AM   #11
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It's the metal corroding. Make sure you are using the correct coolant and at the right concentration and only use distilled water.
Yeah. Won't lie I just use tap....
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Old 01-20-2012, 12:26 AM   #12
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Yeah. Won't lie I just use tap....
There-in lies your problem. I would flush it completely, drain and re-fill with 50/50 mix bought from the store. Tap water is not good.
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Old 10-28-2013, 08:47 PM   #13
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Can a clogged heater core. cause the radiator cap to pop and leak
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Old 10-28-2013, 09:13 PM   #14
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No you can take the hoses to and from the heater core and put a wood plug with no hole clamped to both so no flow and no heater but engine cooling unaffected

However the same gunk that clogs the heater core can clog the radiator

Also the one time I plugged the heater hoses when I reconnected them a year latter that core started leaking. Only an N of one but in my case stopping flow to core was not good for core lifespan
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Old 10-28-2013, 09:16 PM   #15
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My 57 owners manual says distiller water for battery and antifreeze rainwater mx for radiator. The 50 50 mix if paying a lot for the water and mixing

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