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Old 09-03-2012, 06:08 PM   #1 (permalink)
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Red face Temperature Spike

Hello Everyone,

I have a 03 impala 3.8L V6 and lately my temperature gauge has been rising a little above the normal temperature range, There is no overheating and my cooling fans work fine.There is no leaks and i did a radiator drain, flush and fill but wasn't sure how to bleed my cooling system, My question is do anyone have any instructions on how to bleed the system or any ideas on why my temp gauge is rising, Thank's

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Old 09-03-2012, 06:17 PM   #2 (permalink)
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I bleed it by starting cold. I have a friend start the car and increase the RPM to around 1k and keep it there.

At this point I open the rad cap and keep adding coolant and watching for bubbles. When they stop and the coolant stops dropping I top it up and replace the cap.

Worked great for me when I was noticing a temperature increase after a water pump change.

Good luck!


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Old 09-03-2012, 07:53 PM   #3 (permalink)
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Should be bleeder value on top of thermostat housing; loosen value a little until water comes out that should get the air out. Just like old steam radiator heater.

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Old 09-03-2012, 07:57 PM   #4 (permalink)
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Thank's Auntjemima, I just replaced my radiator and didn't have a clue about the bleeding process, Im learning a lot from you guy's and how to repair my impala...

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Old 09-03-2012, 07:59 PM   #5 (permalink)
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Thank's, I'll bleed the system tomorrow...

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Old 09-06-2012, 06:34 AM   #6 (permalink)
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I will be replacing the bypass elbows this weekend and want to make sure the system is bled.

"DO NOT BUY THE CHEAP ELBOWS FROM AZ OR ANY OTHER DISCOUNT PARTS STORE"
They will not last, I am using dealer parts $17 this time.

One tip I have is to squeeze both the upper and lower radiator hoses several times to help dislodge any remaining air pockets. This should be done with the radiator cap off.


Last edited by RDUB; 09-06-2012 at 07:17 AM..
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Old 09-07-2012, 12:09 AM   #7 (permalink)
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Best way to burp the system:

1. Fill Rad all the way
2. Start engine
3. Burp the lines by squeezing them with both hands
4. Fill up again if necessary
5. Let engine warm up to open the thermostat (usually 190-200deg)
6. Fill up if necessary. Dont forget the overflow tank

Edit: Question: What do you consider a flush? Did you just drain the rad? If so I would seriously recommend you to get a flush at a local quakerstate quicklube or similar. They use pressure to flush the system. The stock dex-cool coolant starts to turn milky at 100k miles and usually causes the coolant temp sensor to give false readings and plugs up thermostats. So I would get it properly flushed then replace thermostat and temp sensor if you have not already. Otherwise I guarantee you will have problems very soon. A sure sign of this is your temp gauge not moving at all and your rad fans will start right after engine start.

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Last edited by g25racer; 09-07-2012 at 12:17 AM..
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