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post #1 of 4 (permalink) Old 03-09-2017, 11:09 AM Thread Starter
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Post Running Hot After Bypassing?

PLEASE HELP ME I have a 2008 LS recently I noticed that all the issues was hitting with my heater core so I have by passed the heater core but now im noticing its getting as high at 235!!! the chevy dealership said the check engine will come on if its over heating my fans are kicking on but is it normal to run so high since I by passed heater core?
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post #2 of 4 (permalink) Old 03-09-2017, 12:14 PM
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Normal is 89C (192F).

Here are the specifications.
The ECM commands Low Speed Fans ON under the following conditions:

• Engine coolant temperature (ECT) exceeds approximately 106C (223F).

• A/C refrigerant pressure exceeds 1 310 kPa (190 psi).

• After the vehicle is shut off, the ECT at key-off is greater than 140C (284F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.

The ECM commands High Speed Fans ON under the following conditions:

• ECT reaches 110C (230F).

• A/C refrigerant pressure exceeds 1 655 kPa (240 psi).

• When certain DTCs set

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post #3 of 4 (permalink) Old 03-09-2017, 12:38 PM
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Perhaps there's an air bubble introduced when bypassing the heater core.

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post #4 of 4 (permalink) Old 03-11-2017, 08:22 PM
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Antifreeze should still run into the heater core even when not in use. That extra track should also help cool it down some. Maybe now that it's completely bypassed you've lost that supplemental cooling ability?

Just thinking out loud

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