How do i change the coolant in a 2008 silverado?

The braking system and the engine oil lubricant, and coolant system are not connected apart from the vacuum hose. With the engine warm (not hot), gently hose it down and leave it to dry. The smoke is more likely external. If any did get inside the intake manifold, it will soon burn off on a good run.

could be electrical but most likely bulk head control or vent accuators

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this might be important for you to know
Quote:

08-08-49-002: False Triggering of Low Coolant Level Warning Message (Reprogram HVAC Control Module) - (Feb 13, 2008)

Subject:
False Triggering Of Low Coolant Level Warning Message (Reprogram HVAC Control Module)

Models:
2007-2008 Chevrolet Silverado 2500 and 3500 Heavy Duty Series Only
2007-2008 GMC Sierra 2500 and 3500 Heavy Duty Series Only
with 6.6L Diesel Engine (VIN 6 -- RPO LMM)

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Condition
Some customers may comment that a "COOLANT LEVEL LOW ADD COOLANT" message is displayed in the Driver Information Center (DIC) even though the coolant level is normal.

Cause
This condition may be caused by a false reading during off-road driving or in high slush conditions.

Correction
Do This - Reprogram the HVAC control module.
Don't Do This - Do not replace the coolant level sensor, HVAC control module or radiator surge tank.


A revised calibration has been developed to address this condition. Technicians are to reprogram the Heating Ventilation and Air Conditioning (HVAC) control module with the latest software available on TIS2WEB. Refer to the Service Programming System procedures in SI. As always make sure your Tech 2 is updated with the latest software version.


Warranty Information
For vehicles repaired under warranty, use:
Labor: Operation D4707
Description: HVAC Control Head Module or Assembly Reprogramming with SPS
Labor Time: Use Published Labor Operation Time

google chevy truck forums join and ask the question there more likely to get a reply from others that have had the same prob

if its full try tapping on the coolant resivor with ahammer thts were the low coolant sensor is make sure its full tho

AIR FILTER NEEDS CHANGED TRANSMISSION FILTER & FLUID NEEDS CHANGED MASS AIR SENSOR IS NOT READING ACCURATE ; OXYGEN SENSOR MAY BE GOING BAD;TAKE IT TO THE DEALERSHIP COULD BE MORE WRONG!?

after replacing a thermostat you need to wait till the thermostat opens and re add more coolant till its full. if the lite stays on the sensor is most likely bad

My truck is doing the same thing, also the gas gage is no longer correct, it was all due to a wiring harness i believe, covered by warrenty

the tps sensor needs to be adjusted to 1.5 volts

Check you return/ coolant bottle to see if the hose is not well fitted. Else you might need to change your radiator.

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Good luck