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Discussion Starter · #1 ·
I have a 2010 police impala with a 3.9. Where is the cooling systems air bleed screw located? My heater is blowing cold air when at idle. I checked the coolant and it was low. I added to the proper level but is still blowing cold air when idling.
 

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Question do you have a P0128 Code? If not make sure you top off the Coolant level, Rev to around 2500RPM for 45 seconds and check level and refill where needed do this about 2 or 3 times and after all done it should be ok. Also do make sure that your heater is also open to make sure that you are filling the heater core as well...

Sadly the 3500 and 3900 don't have a bleeding system like the 3800 of older years do and the LS4 did.

Hope this helps
James
 

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To work air out of the system, you can burp it. So basically while it's cold (or warm with gloves and proper safety precautions) squeeze the upper and lower radiator hoses to try to wiggle free the air bubbles. Blast the heat for a while afterwards, then drive it, and then do some more burping. You should be able to work most/all of them free. Then add the appropriate amount of coolant to the reservoir.

The only issue is, if your coolant is low, it probably went somewhere. Make sure the drain petcock is closed and not leaky. Make sure your water pump isn't leaking out on the side of the motor. Check hoses for wear + leaks where they connect to the block and radiator. If all else fails, could always be a head gasket...
 

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Discussion Starter · #4 ·
Do not have any codes. Will check the level again. Have not seen any leaks either.. Don't think its a head gasket the car runs great and no smoke out the exhaust. Car is an ex jacksonville sheriffs car so no telling where the missing coolant went. It only held about a pint and a half.
 

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Would parking nose up on a steep incline with the engine at high idle do the trick?
 

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The overflow tank is located towards the back of the engine bay, so probably not. Honestly, just fill it up, let it run with the heat on full and the cap off, and squeeze both hoses until you feel they're completely full of fluid and no bubbles are coming up in the overflow tank. Then top it off, close it up, and drive like normal. Later on when it's cool again, take the cap off, fill it up, and you should be good to go. It's fairly simple. Just be sure not to burn yourself by doing it when the coolant is hot. Also avoid touching any metal bits attached to the engine.
 
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