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Old 06-20-2013, 10:58 AM   #1
Poundingsand
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Cooling system flush - Mango's sticky

Having just read Mango's sticky on the cooling system refresh and flush, I was curious as to how the flush works. I understand that turning the heater up and the fan on will open the heater vlave and allow coolant to reach the heater core, etc. But I should think that's not the end of the process, as this wouldn't circulate the coolant, just allow a flow-through.

You'd still have air pockets in various locations throughout the block, the pump, or elsewhere. I can't imagine you'd be done with the job without running the car up to a reasonable temp and then rechecking your levels.

Am I missing something?

On a side note, excellent source of info, Mango! Many of yoiur past posts have made for a lot of good reading.
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Old 06-20-2013, 11:04 AM   #2
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If your car is on ramps, you'll get most of the air out. I had to check my level each morning for about a week before it stabilized. I added less than a cup of fluid in the process.
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Old 06-20-2013, 11:23 AM   #3
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You "flush" whatever method you want to. My thread is on what parts to replace and the bleed process.
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Old 06-20-2013, 11:27 AM   #4
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The system is an entirely closed loop. By opening up the bleeder valve at the highest point in the cooling system, air will be eventually forced out of it as the coolant flows through. This is why you continue pouring in coolant until the bleeder stops spitting out air bubbles and only coolant comes out. As the coolant flows through, you'll hear the bleeder screw hiss as air is displaced by the coolant.

Running the car afterwards with the cap off is also important to removing all bubbles as well. Air will find its way to the open expansion tank. You'll need to continue checking your levels for a few days after as small, residual air pockets work their way out. Large air pockets will cause the temp gauge to go wild.
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Old 06-20-2013, 11:53 AM   #5
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I do that plus massage the hoses softly for a little extra time. I've followed mongos cooling thread every time with out a single hick-up.
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Old 06-20-2013, 12:05 PM   #6
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Thanks Zell and saace7. So running of the car is required to some extent. I wasn't sure if the system was designed to remove ALL airpockets at rest, or ???

No need to get testy, Mango. I wasn't questioning your methods, just curious as to how efficiently it bleeds the system and why.
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Old 06-20-2013, 12:08 PM   #7
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Thanks Zell and saace7. So running of the car is required to some extent. I wasn't sure if the system was designed to remove ALL airpockets at rest, or ???

No need to get testy, Mango. I wasn't questioning your methods, just curious as to how efficiently it bleeds the system and why.
Believe me, when I get testy, you'll know it.
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Old 06-20-2013, 12:11 PM   #8
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My car is cool/cold when i do the flush. I never have to turn the car on... If you turn the car on with the cap off your going to throw coolant every wheres... Once i notice no more bubbles out of the bleed screw. Ill drain the ET as needed. Check levels. Then start the car with the cap on, run a little bit then check levels after car is entirely cooled off again.

Massaging the hoses will push a lot of those air bubbles out. It takes me 15-20 minutes before i feel like most of the bubbles are out.

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Old 06-20-2013, 12:23 PM   #9
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massage the hoses softly for a little extra time.
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Old 06-20-2013, 12:36 PM   #10
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I know what I'm doing in the near future. From the service records, my car has only had the hoses replaced in 144k miles. o_O

Maybe I can hire a masseuse for the bleeding job.
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Old 06-20-2013, 12:44 PM   #11
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no need to massage anything. Follow the instructions in the cooling thread and call it a day. no need to discuss anything whatsoever. its all laid out
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Old 06-20-2013, 02:23 PM   #12
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no need to massage anything. Follow the instructions in the cooling thread and call it a day. no need to discuss anything whatsoever. its all laid out
what if i want a massage that day.
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Old 06-20-2013, 02:50 PM   #13
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massaging can be fun and a healthy activity.
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Old 06-20-2013, 03:01 PM   #14
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Personally, I strongly recommend a good massage now and again.
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Old 06-20-2013, 03:16 PM   #15
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what if i want a massage that day.
You must tip first!
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Old 06-20-2013, 03:36 PM   #16
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No, you must give a happy ending.

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Old 06-20-2013, 03:46 PM   #17
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I assume if you massage it right, get all the bubbles out, and she runs fine. That is one happy ending.
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Old 06-20-2013, 03:52 PM   #18
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You concerns are valid and true. You can't bleed all the air out without running the engine, especially if you have an automatic transmission and you took the AT cooler block off. You need to drive the car for a bit and make the AT thermostat open. Coolant will fill the block and you'll get a low level indicator. Top off, and you'll be good after that.

My process was this:

1. Fill with coolant w/ bleeder screw off and heat on 91F min fan
2. Overflow at slow rate until bubbles stop from bleeder screw
3. Put screw and cap on
4. Run engine until warm with heat on
This is where my car started to over heat. I revved it to 3000 RPM and the temp dropped immediately.
5. Wait to see if it overheats
6. doesn't over heat - go drive around
7. Low coolant light comes on as the tranny becomes warm (I think that's what caused it)
8. Top off in parking lot on the way to Zaxby's
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