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Old Aug 6, 2015 | 01:35 PM
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My 1990 Corvette with a mfg date of 01/90 has upper and lower radiator hoses date coded 12/89. After 25 years and 106,000 miles should I worry?
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Old Aug 6, 2015 | 01:40 PM
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They made it this far, so whats a few more miles.
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Old Aug 6, 2015 | 02:29 PM
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Just looking through some of the new postings and seen that your C4 has a mfg date is 1/90 so does mine. It is also white with the saddle interior and was originally from Las Vegas. The last 6 of my VIN number is 108356.
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Old Aug 6, 2015 | 02:36 PM
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Originally Posted by kenpeindl
Just looking through some of the new postings and seen that your C4 has a mfg date is 1/90 so does mine. It is also white with the saddle interior and was originally from Las Vegas. The last 6 of my VIN number is 108356.
108595 here, black interior. Originally bought in Valencia, Ca. Just another 239 later that month.
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Old Aug 6, 2015 | 02:40 PM
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In one of the C4 classes I attended the speaker stated that the upper radiator hose bursting on the C4s along with the trash that accumulates between the AC radiator and the car's radiator were the 2 worst problems in the cooling system.
He recommended changing out the upper hose before each summer's cruising season. He said that under hood heat was the problem.
Since the newest of the C4s is approaching 20 years of age then all owners should be aware of this problem.
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Old Aug 6, 2015 | 02:45 PM
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Anybody chime in the Difficulty in both of these projects?
Is this something a weekend mechanic like me can do?
Thanks.
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Old Aug 6, 2015 | 02:45 PM
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I would be concerned. You don't want a hose to go and end up in a bad situation. Change them all. You can find them at Rockauto at a reasonable cost.
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Old Aug 6, 2015 | 02:45 PM
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Originally Posted by corvetteronw
In one of the C4 classes I attended the speaker stated that the upper radiator hose bursting on the C4s along with the trash that accumulates between the AC radiator and the car's radiator were the 2 worst problems in the cooling system.
He recommended changing out the upper hose before each summer's cruising season. He said that under hood heat was the problem.
Since the newest of the C4s is approaching 20 years of age then all owners should be aware of this problem.
I cleaned out the radiator right after I got it. Horribly neglected. I've been on a total of 650 miles on road trips since May. The only reason I mentioned it was "tongue in cheek" because I'm ordering all new underhood hoses for it and flushing/changing coolant which has been in there for 3.5 years. Dexcool.

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Old Aug 6, 2015 | 02:49 PM
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Originally Posted by tbirdsps
108595 here, black interior. Originally bought in Valencia, Ca. Just another 239 later that month.
They are like 2 to 3 days apart depending on what the daily production numbers were back then. Yours is the closes I have found so far.

Thanks
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Old Aug 6, 2015 | 02:51 PM
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Also my rad hose (at least the upper) has already been replaced prior to my owning the car. It just turned 60,000.
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Old Aug 6, 2015 | 03:05 PM
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Originally Posted by kenpeindl
Also my rad hose (at least the upper) has already been replaced prior to my owning the car. It just turned 60,000.
Close in number but at opposite ends of the country. Mine sure likely took a train ride, yours likely by truck.

BTW my wife is from New Kensington, Pa.
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Old Aug 6, 2015 | 03:10 PM
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Mine were fine!



Changed them when I bought the car lol
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Old Aug 7, 2015 | 03:34 AM
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I changed my upper and lower radiator hoses when the car was about 20 years old. The original hoses were both fine and I don't think they really needed to be replaced.
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Old Aug 7, 2015 | 08:01 AM
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Originally Posted by tbirdsps
My 1990 Corvette with a mfg date of 01/90 has upper and lower radiator hoses date coded 12/89. After 25 years and 106,000 miles should I worry?
I cant remember a radiator hose letting go while sitting in my yard,always happens when least expected.Change them yesterday.
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Old Aug 7, 2015 | 11:27 AM
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My top hose on the 95 had been replaced at one time, don't know when. But it blew as my friend was driving it on the autocross course. He shifted from 1st to 2nd and in 4 seconds we lost 1.5 gallons of coolant.

Replace the hoses.
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Old Aug 7, 2015 | 12:33 PM
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radiator hoses can look just fine and be shot. the hoses reinforcing layer can break down inside the rubber and you will never know till it pops. 10 years is about all id trust them for.
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Old Aug 7, 2015 | 03:01 PM
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Originally Posted by John A. Marker
I would be concerned. You don't want a hose to go and end up in a bad situation. Change them all. You can find them at Rockauto at a reasonable cost.
$153 less shipping from Rock Auto for everything. I'll probably order sometime next week. It's time for a coolant change anyway. 3+ years on the Dexcool.
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Old Aug 7, 2015 | 11:34 PM
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Originally Posted by tbirdsps
$153 less shipping from Rock Auto for everything. I'll probably order sometime next week. It's time for a coolant change anyway. 3+ years on the Dexcool.
Way to go - money well spent.
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Old Aug 17, 2015 | 10:38 AM
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Update, found that the heater core is leaking. Oh well, total cooling system work now. Ordered all the parts from Rock Auto. Now waiting for cooler weather.
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Old Aug 17, 2015 | 04:19 PM
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Originally Posted by tbirdsps
Update, found that the heater core is leaking. Oh well, total cooling system work now. Ordered all the parts from Rock Auto. Now waiting for cooler weather.
Common repair. Luckily for me it mine was replaced by the previous owner along with the water pump.
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