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Old November 3rd, 2013, 06:37 PM   #1
tsaguy
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Default 2007 Chev Impala 3500 V6 no heat

Looking for help from those who know...

1. Car stopped blowing heat while in idle, only when driving did it blow heat through the cabin.
2. Replaced thermostat, filled with coolant.
3. Still no heat.
4. Removed upper heater hose, filled coolant from here to try and bleed, but to no avail.


My questions are:

1. Is there a fail-safe way to bleed? Like a bolt or something? Or am I left to non-manufactured ways to bleed?
2. Does the heater core in these tend to build gunk inside?

Thanks for helping.
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Old November 3rd, 2013, 07:00 PM   #2
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Take a heater hoses off and blow compressed air thru the hoses in both directions.

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Old November 4th, 2013, 05:55 AM   #3
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Two common problems with these cars. First is head gaskets leak air into cooling system, causing air pocket in heater core. You may be able to see external leak from the headgasket leaking down the side of the block. Next there is a problem with getting air out of the system once the cooling system has been opened. IIRC you have to jack up the drivers side of the car to make it higher than the passenger side, disconnect the heater hose & fill with coolant, run engine to temp & burp the system with it jacked up.

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Old November 4th, 2013, 06:43 AM   #4
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Burp? I've read a few times on the 'net that I need to do it this way, but is the word 'burp' indicative of more action? Will give this a try this morning.
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Old November 4th, 2013, 03:37 PM   #5
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burp= getting air pocket/bubble out of cooling system.
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Old November 4th, 2013, 03:43 PM   #6
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Burp - Rub or pat its back gently after feedings.
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Old November 4th, 2013, 04:05 PM   #7
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 1. With the engine cooled off, remove the coolant pressure cap.
 2. Remove upper heater core hose from the metal pipe on the engine.
 3. Add coolant to the metal pipe, until full.
 4. Raise the rubber portion of the heater core hose as high as it will go with it still attached at the heater core. Using a funnel, add coolant until the hose is full.
 5. Reconnect the heater core hose.
 6. Start engine, have assistant raise the RPMs to about 1500 to 1700 RPMs, top coolant off at engine, then before lowering engine RPMs, install the coolant pressure cap.
 7. Fill coolant reservoir as necessary, then check the heat at idle.
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Old November 4th, 2013, 05:08 PM   #8
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I jacked the car up to raise the drivers side higher than the passenger side. Removed radiator cap, filled to the brim, filled coolant reservoir, removed upper heater core line, filled the metal part, removed lower hose, attached a clear line about 4 feet long and fastened to the nose of the opened hood. Using another clear line, I attached that to the upper hose and blew. As the fluid moved up the clear line, it also expelled air. I did this till no air escaped. Fastened the lower hose, filled the upper hose to full, fastened it back the return lines, and let the engine get nice and hot. Finally watched more air escape from the radiator fill point. Let it run for 20 minutes, and then replaced radiator cap. Topped off reservoir, and drove like I stoled it to get everything working right.

RADRICK-- You have helped me many times, and I thank you very much.

Thanks for the input all, /thread.
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Old November 5th, 2013, 03:54 PM   #9
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Glad you got it figured out!
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Old November 5th, 2013, 07:02 PM   #10
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Keep an eye on the coolant level, those had issues with the crossover tube gaskets leaking. There is a TSB and updated gaskets.
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