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

Throttle body bypass mod

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Old Feb 16, 2022 | 11:21 AM
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Default Throttle body bypass mod

So I just did the coolant throttle body bypass mod and now my coolant temp at idle is 120 degrees Fahrenheit and im wondering if this is ok or if I should reverse it.
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Old Feb 16, 2022 | 11:52 AM
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What exactly did you do?

Bypassing the TB is not going to affect the coolant temperature.
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Old Feb 16, 2022 | 12:04 PM
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Old Feb 16, 2022 | 12:05 PM
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Originally Posted by vader86
What exactly did you do?

Bypassing the TB is not going to affect the coolant temperature.
I just followed multiple tutorials and bought a kit to do it. I assume I did everything how I was supposed to and I plugged the holes it said to do and when I started my car up it said 112 degrees. I don't remember what the temp was before hand but I don't think it was that high. I did also install a new thermostat so it might be that I just didn't want to take it out for a drive and fry my engine.
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Old Feb 16, 2022 | 12:09 PM
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First I'd make sure the units in the car display are F and not metric C.

A bypass is just the two coolant lines on either side mated together with two clamps and a little pipe, that won't do anything to coolant temps.

More likely is the stat is stuck open? Its something else you did.
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Old Feb 16, 2022 | 12:11 PM
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Originally Posted by vader86
First I'd make sure the units in the car display are F and not metric C.

A bypass is just the two coolant lines on either side mated together with two clamps and a little pipe, that won't do anything to coolant temps.

More likely is the stat is stuck open? Its something else you did.
It is in Fahrenheit not Celsius. The thermostat is brand new and it's a 180° one. I bought a bypass kit that replaced 2 tubes with just one so it looks better.
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Old Feb 16, 2022 | 12:16 PM
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its pretty much impossible to keep a C4 at 120F idle coolant temps, did you take out the CTS? cut its wire or something? Its right there at the front of the intake manifold.

Bring the car up to temp with the rad cap removed to burp the system at 180F, fill the coolant up and put the cap back on with the engine revved to about 1500-2000rpm to suck the fluid down.

Then verify the temps you see in the car gauge with a scanner.
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Old Feb 16, 2022 | 12:24 PM
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Originally Posted by vader86
its pretty much impossible to keep a C4 at 120F idle coolant temps, did you take out the CTS? cut its wire or something? Its right there at the front of the intake manifold.

Bring the car up to temp with the rad cap removed to burp the system at 180F, fill the coolant up and put the cap back on with the engine revved to about 1500-2000rpm to suck the fluid down.

Then verify the temps you see in the car gauge with a scanner.
I can check if my cts is unplugged. I was unplugging things a while ago and it is completely possible that I just forgot to plug it back in if not I'll try the other suggestion. Thank u for all ur help and insight.
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Old Feb 16, 2022 | 12:50 PM
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Originally Posted by vader86
its pretty much impossible to keep a C4 at 120F idle coolant temps,
Even with NO thermostat, there is no air flow through the radiator at idle, so coolant temp can only go UP, until the fans come on.
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