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#1 |
![]() Join Date: Mar 2004
Location: Sacramento, CA.
Posts: 141
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About 2 months ago put in a new radiator, while I had it apart I replaced the thermostat. I put in a Stant 14068 thermostat and a DeWitt A90M radiator. After about 500 miles the radiator started leaking. I pulled it out and sent it back to DeWitts’s. Tom checked it out and said it had been overpressure. 90% of the tubes were ballooned out the end caps were also expanded. These end caps are made of .060 inch thick aluminum, that took a serious pressure excursion. I had reinstalled the stock radiator to keep the car running. After about 500 miles the same things happened to the stock radiator. Before replacing the radiator again I checked out the whole system. The only questionable part was the Stant 14068 thermostat. Evidently the pressure relief function of the thermostat was not functioning properly. After several conversations with Tom DeWitt I put the stock thermostat back in with another new A90M. The radiator in ALL of the C4’s are the same. The LT5 engine was designed with a much higher water flow than the other C4 engines. The radiator was designed for the standard engine. This means that the by-pass feature on our ZR-1’s must work or the radiator (weak point) will break! From what I’ve learned pressures inside my radiator exceeded 50psi to cause the damage that it suffered. I am attaching pictures of the stock & Stant thermostats and the housing. BTW I don’t see how the thermostat can be put in backwards. It simply will not fit.
Stock thermostat ![]() STANT 14068 ![]() housing ![]() Thanks for reading
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#2 |
![]() Join Date: Dec 2003
Location: McHenry, Il.
Posts: 6,607
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gud post bill...who would of thought that a bogus bypass could lead to all the problems...glad u got a handle on it!!!
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http://i119.photobucket.com/albums/o...9mcw/SIG-2.jpg http://i119.photobucket.com/albums/o128/wb9mcw/vcm.gif "The Budget should be balanced, the Treasury should be refilled, public debt should be reduced, the arrogance of officialdom should be tempered and controlled, and the assistance to foreign lands should be curtailed, lest Rome will become bankrupt. People must again learn to work instead of living on public assistance." - Cicero, 55 BC " We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution." - Abraham Lincoln |
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#3 |
![]() Join Date: Mar 2004
Location: Sacramento, CA.
Posts: 141
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Hey, We learn something new every day.
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#4 |
![]() Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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Jez'us Bill, sorry to hear that this happened to you!! I suppose that the real answer is stay with the stock GM T-stat??? Does Mr. DeWitt think that the stant could have been defective?
I hope the trouble for your car is over! ![]() Tom
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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#5 |
Join Date: Aug 2005
Location: San Fernando Valley, CA.
Posts: 896
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That's one heck of an expensive lesson, thanks for sharing that withus.
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1990 ZR1, 142,000 miles-Black on black 4.09's Haibeck chip, 3"exh, K&N, meth inj. |
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#6 |
![]() ![]() Join Date: Jun 2005
Location: pittsburgh
Posts: 4,633
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I've had to replace 4 rads. It was not a very fun summer that year
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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#7 |
![]() Join Date: Mar 2004
Location: Sacramento, CA.
Posts: 141
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I listed the same post on 2 other boards, The thread on corvetteforum was very informative
http://forums.corvetteforum.com/show...79&forum_id=50 It looks like the Stant part number is good, but the wrong part was in the box. I will be talking to Kragen where I bought it. Lets see what they have to say.
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#8 |
Join Date: Sep 2005
Location: Centerville, Utah
Posts: 134
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Thanks for the heads up. Doesn't look like much fun figuring this one out
![]() I saw the thread on CF last night. Glad to hear you've got it figured out now ![]() Craig
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I feel sorry for people who don't drink, because when they wake up, that's best they feel all day -- Frank Sinatra Beer is proof that God loves us and wants us to be happy. -- Author Unknown, it is NOT Benjamin Franklin |
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