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Old June 14th, 2009, 12:06 PM   #1
bugdude
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Default 93 GMC Suburban 7.4l Radiator Iusses

I acquired a '93 GMC Suburban 7.4l 4x4 from my brother, he was the second owner. First owner is a friend of the family.
This thing has had issues with the radiator a few different times over the years...Clogging, leaking, which was either fixed or replaced completely.

was wondering if this is a common issue with these vehicles?

The radiator was replaced about 2 years ago, and back in December it developed a leak on the top portion of the radiator, which was removed rodded and re soldered. it is running the green antifreeze not Dexcool.

You all have any Ideas as to why this is happening?


Thanks!
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Old June 14th, 2009, 01:16 PM   #2
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Originally Posted by bugdude View Post
I acquired a '93 GMC Suburban 7.4l 4x4 from my brother, he was the second owner. First owner is a friend of the family.
This thing has had issues with the radiator a few different times over the years...Clogging, leaking, which was either fixed or replaced completely.

was wondering if this is a common issue with these vehicles?

The radiator was replaced about 2 years ago, and back in December it developed a leak on the top portion of the radiator, which was removed rodded and re soldered. it is running the green antifreeze not Dexcool.

You all have any Ideas as to why this is happening?


Thanks!
Do you do a flush and fill every year? I do and never had a problem with mine.
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Old June 16th, 2009, 07:52 PM   #3
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I just got the Sub Memorial day weekend. I will flush it later this year!
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Old June 16th, 2009, 08:07 PM   #4
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had a clogging problem on my 95 suburban...rear heat would not work...Had it power flushed at a radiator shop and it has been great since...
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Old June 16th, 2009, 08:34 PM   #5
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Is it a all copper/brass radiator or is it plastic? My old one was leaking. You could either go w/ plastic sides or copper/brass tanks. i opted for the copper brass because it's stronger and never had a problem since. It also costed 220 for a 4 core and it was for a 7.4 also. I would power flush it also like NitzPixs said!
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Old June 16th, 2009, 09:04 PM   #6
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given your in texas I would suspect you have heat issues. the fact is you don't have freezing problems like we do up here in Michigan so you probally don't check your freeze level with a tester. I like to see the bubble or float testers around -30*. that way it absorbes heat well and can't freeze. the other part of the mix to keep your radiator from rotting is how acidy does it smell? if you have brown rings in the over flow bottle and or really acrid smelling radiator fluid its most likely letting combustion gases into the cooling system. if thats the case you may have a bad head gasket.
if the core on the outside of the tank are truning white then you are rotting from the outside in. if the fins are turning red (and flaking off)then the rad is shot and needs replaced
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Old June 18th, 2009, 12:44 AM   #7
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1st it is an all copper radiator.

as far as it getting cold here have seen it get down to about 9 one time, so I have been in the habit for years(learned it from Dad) to keep the anti freeze level at 0 degrees or lower. the Suburban when my brother had it, was in Gallup NM where it gets a whole lot colder than here, so I am sure it set up for the colder temps they have.
I will check the overflow bottle in the morning to see if it has brown rings in it and will also smell the mix in the radiator.

will advise on what I find.

thanks for the help!
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Old June 18th, 2009, 05:28 PM   #8
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OK here is what I found.

The tester needle is off the chart, way below the -37 mark. Antifreeze does not smell acidic.

one thing I did find today while installing a Transmission Oil Cooler was 2 wires hooked up from the top of the radiator to the top of the radiator support. I assume that these are to ground the radiator? They may have been installed the last time the radiator was cleaned and rodded, this was back in December.
what are your ideas on this?

no Brown rings inside the overflow bottle either.
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