C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

why am i running hot

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Old Jul 30, 2010 | 06:06 PM
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Default why am i running hot

car is a 94.

i recently did a cam swap. I have a new waterpump, new 160 thermostate. also flushed radiator, cleaned out fins. Fans are on manual swtich so both running off of key on.

Car will run about 30min at about 205, i turn the AC on and the temp will climb one degree at a time until i turn the car off...i watched and went all the wayo to 240 and i shut car off.

what else can i do? is a real pain to be scared to turn on the AC.
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Old Jul 30, 2010 | 06:09 PM
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Originally Posted by 94roseman
car is a 94.

i recently did a cam swap. I have a new waterpump, new 160 thermostate. also flushed radiator, cleaned out fins. Fans are on manual swtich so both running off of key on.

Car will run about 30min at about 205, i turn the AC on and the temp will climb one degree at a time until i turn the car off...i watched and went all the wayo to 240 and i shut car off.

what else can i do? is a real pain to be scared to turn on the AC.
Don't your fans turn on automatically when you turn on the AC?
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Old Jul 30, 2010 | 06:14 PM
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Did you have the car retuned to the new combination?
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Old Jul 30, 2010 | 06:19 PM
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both of my fan come on when the key is on. yes car has been retuned by pcmforless.
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Old Jul 30, 2010 | 06:24 PM
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Did you bleed the cooling system?
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Old Jul 30, 2010 | 06:35 PM
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yes i let it idle for over 30min...bleed air out of the system and never got over 205, then drive down the road with ac on and will over heat.
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Old Jul 30, 2010 | 06:41 PM
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Well 240 isn't "overheat"

You may need to go to better fans or new radiator. Even though you cleaned the old one it may have enough crud to not transfer enough heat. Consider a dewits, on my 92 I rarely see 220 after a 30 min track session (lot of time right near the rev limiter)

Something I just thought of - did you clean the AC condenser as well? Since it sits in front of the radiator it could be blocking air flow.
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Old Jul 30, 2010 | 06:42 PM
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took a pressure washer to the condencer since i couldnt take it out...
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Old Jul 30, 2010 | 06:43 PM
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Sorry...I'm scratching my head....no reason for just doing a cam swap to make it overheat.Might get your Radiator Rodded out...Might have some restrictions that your flushing couldn't help.That's all I can think of.Radiator Eficiency less than 100%.
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Old Jul 30, 2010 | 06:43 PM
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i have an extra set of fans...i think i am going to replace the secondary fan with extra primary and see if that helps...
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Old Jul 30, 2010 | 06:49 PM
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Originally Posted by jaa1992
Well 240 isn't "overheat"

You may need to go to better fans or new radiator. Even though you cleaned the old one it may have enough crud to not transfer enough heat. Consider a dewits, on my 92 I rarely see 220 after a 30 min track session (lot of time right near the rev limiter)

Something I just thought of - did you clean the AC condenser as well? Since it sits in front of the radiator it could be blocking air flow.
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Old Jul 30, 2010 | 06:52 PM
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Originally Posted by 94roseman
i have an extra set of fans...i think i am going to replace the secondary fan with extra primary and see if that helps...
I don't think fans are your problem. If you are running both fans all the time.
You have water or air flow blockage somewhere.
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Old Jul 30, 2010 | 06:53 PM
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ok so i think i just got some helpful info...both fans are supposed to blow the same and i have one that blow hard and the other i could get more air from my mouth! so im thinking maybe thats my problem.
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Old Jul 30, 2010 | 07:40 PM
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well new fan did not make any changes....
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Old Jul 30, 2010 | 07:42 PM
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and i know 240 isnt over heating but it was still climbing so thats why it got shut off
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Old Jul 30, 2010 | 08:07 PM
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My 96 has always had issues when sitting in traffic from the day I bought it.

I have replaced everything at least once and currently; everything in the engine bay is new and I still have the same issue. No problem when driving just sitting. Here is the list

New fans
New radiator
New hoses
New thermostat, programmed to turn on early
Bleeded the system and made sure both fans are turning on
No trash in front of the radiator
Put in water wetter
New water pump

Before I supercharged it, I had a BeCool radiator in it and still didn't make a difference.

I have spoken to anyone that is willing to listen and decided that my car is just one of those odd occurrences.

Other than that, car runs great. Also, let me qualify this; the car only gets hot on days where the tempurature is above 85 degrees.

Glenn
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Old Jul 30, 2010 | 08:27 PM
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Originally Posted by 94roseman
well new fan did not make any changes....
I told you it's not the fans. Your radiator probably has blockage.
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Old Jul 30, 2010 | 08:30 PM
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well going to pick up new radiator in the morning...thats all there is left. And it doesnt matter if car is going down the interstate...it still slowly climbs up in temp.
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Old Jul 30, 2010 | 09:38 PM
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Did you use sealant around the WP?

Saw a car in the shop and the guy put a new WP on and the car was overheating, well I was in the shop when the mechanic told the guy that half of the opening on one side was blocked by sealant.
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Old Jul 30, 2010 | 10:22 PM
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Just a fyi, my car usually runs between 176 to 200 with the 160 themostat.
You might want to double check your thermostat, when doing your radiator.
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