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

Car Overheating?

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Old Jul 16, 2015 | 04:55 PM
  #1  
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detomaso55
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Default Car Overheating?

Hi Everyone,

This is my first post as a member so I apologize for my ignorance. I just bought a '94 LT1 coupe w/auto tranny and when I was in stop and go traffic, the engine temp needle seemed dangerously high. I didn't know there was a digital gauge until today so I dont know the exact temp it was running at.

My questions are as follows
  1. What is normal operating temp and what is considered too hot??
  2. I have read that turning on the AC actually helps cool the engine on these cars. Is this true?

Thanks in advance! I've never driven a car that ran this hot so I'm a little concerned.
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Old Jul 16, 2015 | 05:15 PM
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Originally Posted by detomaso55
Hi Everyone,

This is my first post as a member so I apologize for my ignorance. I just bought a '94 LT1 coupe w/auto tranny and when I was in stop and go traffic, the engine temp needle seemed dangerously high. I didn't know there was a digital gauge until today so I dont know the exact temp it was running at.

My questions are as follows
  1. What is normal operating temp and what is considered too hot??
  2. I have read that turning on the AC actually helps cool the engine on these cars. Is this true?

Thanks in advance! I've never driven a car that ran this hot so I'm a little concerned.
1. The fans come on at 228 and 238

2. Yes

Best to pull the top radiator shrould off and give a good cleaning. Give it a good flushing by pulling your knock sensors.
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Old Jul 16, 2015 | 05:26 PM
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detomaso55
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Originally Posted by antfarmer2
1. The fans come on at 228 and 238

2. Yes

Best to pull the top radiator shrould off and give a good cleaning. Give it a good flushing by pulling your knock sensors.
Thanks for the reply!

Is it noticeable when the fans turn on? Should I be actually able to hear them turn on? I just want to make sure that they are actually turning on and working properly.
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Old Jul 16, 2015 | 05:31 PM
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L98Justin
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From: Helotes Texas
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Originally Posted by detomaso55
Thanks for the reply!

Is it noticeable when the fans turn on? Should I be actually able to hear them turn on? I just want to make sure that they are actually turning on and working properly.
You should hear or feel them kick on, i would let it idle in the drive way to ensure both kick on when they are supposed too... try cleaning in the radiator shroud first its free and beneficial C4's are plastic bag eaters
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Old Jul 16, 2015 | 05:59 PM
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Running in the 220s all day is fine, as designed.

Also, the analog gauge isn't really linear, so the needle looks higher than the reading really is. On the C5s they "fixed" this problem by making 220 read straight up on the gauge. That way is doesn't scare people by looking too far to the high end.

Last edited by markKlein; Jul 16, 2015 at 06:02 PM.
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Old Jul 17, 2015 | 11:41 AM
  #6  
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tenaus
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From: Auburn NH
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Originally Posted by antfarmer2
1. The fans come on at 228 and 238

2. Yes

Best to pull the top radiator shrould off and give a good cleaning. Give it a good flushing by pulling your knock sensors.
Before you pull the shroud off I would aim a flashlight between the radiator and the ac condenser, where the ac lines go in, and see whats inbetween them, leaves twigs etc. I attached a piece of PVC to my shopvac and vacuumed out everything I could using the space where the ac lines go in.. Did a pretty good job and it's much easier.

I ended up putting in an aluminum radiator anyway. Mine is a 94 lt1 convertible.

A lot depends on how mechanically inclined you are.

Last edited by tenaus; Jul 17, 2015 at 11:43 AM.
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