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Over heating? Maybe?

S

salah

Guest
Hello All,

Added a coolant bypass kit by coupling both hoses connected to throttle body. Started Car, drove about 1/2 mile, Temp reading at
230 plus F.

Removed coolant bypass kit, re-connected to original format, same problem with temp.

What went wrong?

Helppppppppppppppppppp.......

Thanks

2000 HT.
 
S

salah

Guest
A little bit, but I added more to normal levels.
 

69MyWay

Well-known member
Joined
Jul 3, 2001
Messages
4,364
Location
Auburndale, Florida
Corvette
1969 Killer Shark
This may be a question for C4C5 Specialist. He knows virtually everything about a C5.

Let's see what he has to say when he sees this thread.

Oh, by the way, welcome to CAC!
 
S

salah

Guest
Thanks...

OK C4C5 man..... Help me....

Is it possible that I may have bumped a sensor?
 
V

vettepilot

Guest
I'm definately not C4C5 specialist, and certainly wouldn't claim to be, but when you refilled the cooling system did you make certain that all the air was purged from the top of the radiator? Any trapped air will be quickly circulated and may cause trapped air pockets reducing the circulation, thus reducing the effectiveness of the cooling system. That's what it sounds like to me, but I could be way off also. BTW, if I remember correctly, bypassing the throttle body on a LS1 and /or LS6 does nothing to improve performance. It did help on the LT1 and LT4 engines, but not the Gen III because the TB material is not heat conductive.
vettepilot
 
S

salah

Guest
I'll try to do the purge.... I wonder if the DIC needs to be reset?

I can disconnect the battery, reconnect see if that helps. My last option, which I'm approaching very fast, is to take the car to the chevy boys...

Wonder if I can make it to the dealer?

Thanks
 

69MyWay

Well-known member
Joined
Jul 3, 2001
Messages
4,364
Location
Auburndale, Florida
Corvette
1969 Killer Shark
I can say this, if you have a little air in there, it does get much hotter than the water/coolant and will steam up in the engine causing the temp sensor to read some wild ultra high spiky temps.

Too bad you don't have a scanner because you could plug that in and take a comparison between the computer temp signal and gauge. They use two different sensors so that helps you make a reasonable comparison. Also, the temp wands that use a lasor to read are great for your current problem.

When I did the engine swap in my 90 I had used the wrong adapter in the passenger head for the temp gauge sensor. It was bottomed out. It would read normal temps for the first couple of minutes, then shoot off the chart. In an abundance of caution, I tested against the scanner. The scanner was fine, then I got a temp gun and shot it all over the engine. It was withing 2 to 5 degrees of the computer based temp sensor. So, new bushing and sensor into the driver head, then I swaped the wire with a jumper back and forth. Long story short, I was not really running hot.

Typically if you have a little amount of air in there and you start the engine and get it to temp. Holding the RPM around 2,00 rpm, then alternate with deep throttle shots, it will slowly purge the air around. After it has hit temp, you shut it down making sure the overflow bottle is full. Often a closed system will purge the air into the overflow tank, then suck new coolant back in as it cools to replace the vacuum in the system caused by the now missing air. In other words, it sits overnight after heating it up and reving on it and it is fine the next day. I have had this happen with several LT1 engines that I put into other vehicles.
 

c4c5specialist

Technical Advisor
Joined
May 29, 2001
Messages
3,682
Location
New Haven, Ct. USA
Corvette
Nope, but someday.
HI there,
Sorry so late, however, all point brought to the table here are valid questions.
Now, my issue, is I would need to know the temps before the install.
Also, did you take it on the highway?? At a steady cruise, you should be about 185=200, depending on what is in front of you, and the outside temperature.
Air lock, possibly, I would turn on the AC, and see if your cooling fans go on low, and what your temp reads at that time.
There is nothing that would need to be reset on the DIC, so I feel that you are fine.
Just remember, your fans, unless your AC is on, will not turn on till 228, so given tolerances, 235 in the city, would be considered normal.
Please let us know what you have, c4c5:hb
 
S

salah

Guest
Thanks to all who replied.

To answer C4C5:
Normal temp that I'm used to is about 192-198.
Did not take to highway after temp reached 240.
Turned AC on, the fans kicked on, temp remained at 240 plus.
No steam visible.

The good news, got it fixed now...... :)

The problem, the fix:
Well, 69 MyWay suggestion about coolant low was right. Although I mentioned that it I lost a little bit coolant, Oh, silly me, turns out that I lost 1.5 gallons of coolant... So, I left the chevy dealer feeling rather stupid.. But hey, my baby is happy now...

Got to thinking, maybe it's time to get eye glasses. It may help me see better next time...

Thanks again...
 

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