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How do i purge the air out of a 2011 chevy 2500 duramax i cant find a bleeder screw
With no bleed screw, you just fill the coolant tank and run the engine to operating temp ( t-stat open).
Then monitor the coolant tank and if it needs more coolant then add and run the engine to operating temp, repeat till you no longer need coolant added to your system
 

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Discussion Starter #3
It has a 2 sided surge tank it will not drain into the radiator it just sits in the surge tank i changed the thermastats but its not over heating
 

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In case you don't have it available.
Diesel Supplement, 2011 LML:

Checking Coolant (Pickup Models)
The coolant surge tank is located in the engine compartment on the passenger side of the vehicle. See
Engine Compartment Overview on page 10‑4 for more information on its location.
The vehicle must be on a level surface.
When the engine is cold, the coolant level should be between the MIN and MAX marks.

Adding Coolant (Pickup and Van Models)
If more coolant is needed, add the proper DEX-COOL coolant mixture at the surge tank, but be careful not to spill it.

Notice: This vehicle has a specific coolant fill procedure.
Failure to follow this procedure could cause the engine to overheat and be severely damaged.

If no coolant is visible in the surge tank, add coolant as follows:

1. Remove the coolant surge tank pressure cap when the cooling system, including the coolant surge tank pressure cap and upper radiator hose, is no longer hot.
Turn the pressure cap slowly counterclockwise about one full turn. If a hiss is heard, wait for that to stop. A hiss means there is still some pressure left.

2. Keep turning the pressure cap slowly, and remove it.

3. Fill the coolant surge tank with the proper mixture as follows:
. To the MAX mark on the pickup
. To the COLD FILL mark on the van

4. With the coolant surge tank pressure cap off, start the engine and let it run until the engine coolant temperature
gauge indicates approximately 90°C (195°F).
By this time, the coolant level inside the coolant surge tank may be lower. If the level is lower, add more of the proper mixture to the coolant surge tank until the level reaches the proper level.

5. Replace the pressure cap.
Be sure the pressure cap is hand-tight and fully seated.

6. Verify coolant level after the engine is shut off and the coolant is cold. If necessary, repeat coolant fill procedure
Steps 1 through 6.

If the coolant level is still low after having followed these steps twice, have the coolant system checked a certified technician at the dealer for a possible leak.

Notice: If the pressure cap is not tightly installed, coolant loss and
possible engine damage may occur.
Be sure the cap is properly and tightly secured.
 
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