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Old 04-24-2012, 11:30 AM   #1 (permalink)
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How long does it take to bleed air out of coolant system?

Well, I flushed the coolant. Even disconnected the heater core hoses and flushed that out. Had the front elevated about ten inches and bled the air out for 30 minutes and couldn't get it all out. So, I drove the front end up on a small hil so it was sitting at almost a 45 degree angle and bled the system another 20 minutes. The supply hose for the heater core is hot I can barely hang onto it, but the return line is cool. The heat coming out of the vent did get hot for about a minute and then cooled back down.

The coolant would come out of the bleeder valve only when I guess the thermostat would open up. I thought once it would build pressure it should blow all the time. I'm planning on driving it to see if the air will come out.


But, looking for suggestions.

Bobg

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Old 04-24-2012, 07:34 PM   #2 (permalink)
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Seems like the core is still either clogged up or the air has not been bled out fully.

I have good success with just filling up the radiator first with the engine off and cool,
I then grab the radiator hose and give it a squeeze to force the coolant into the lines.

Then, once it is full, I start the car with the cap off, the coolant level will go down, I pour in enough to fill it and then put on the cap.

I then let it run until the temp gets up with the heat on high.

Then I open the bleeder valves until I see nothing but liquid coming out.

Sometimes it takes a few attempts but on my current 03 I only did 1 and it took about 45 minutes total.

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Old 04-24-2012, 08:28 PM   #3 (permalink)
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Stephen,

I finally got it bled tonight, but still have no heat. When I flushed the the radiator, I removed the hoses going to the heater core and flushed them out good. So, it is not plugged. Is there a solenoid or something that regulates the amount of coolant going through the heater core? If I run the heat on high and the fan on low it will get warm, but if I turn the fan too high it get cool real quick.

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Old 04-24-2012, 08:32 PM   #4 (permalink)
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Quote:
Originally Posted by unioncreek View Post
Stephen,

I finally got it bled tonight, but still have no heat. When I flushed the the radiator, I removed the hoses going to the heater core and flushed them out good. So, it is not plugged. Is there a solenoid or something that regulates the amount of coolant going through the heater core? If I run the heat on high and the fan on low it will get warm, but if I turn the fan too high it get cool real quick.

Bobg
Still clogged. Run water through the Core in both directions. Then bleed air out again.

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Old 04-26-2012, 01:06 PM   #5 (permalink)
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Still clogged. Run water through the Core in both directions. Then bleed air out again.

That's what I'm going to do this weekend, if it keeps raining. I only run water through it in the direction it normally flows. The more I think about this the more I think it is partially clogged. It seemed like it took quite a bit of water pressure to flush it the first time.


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Old 04-26-2012, 05:28 PM   #6 (permalink)
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Raining tonight so I got a chance to work on the Impala. Pulled the heater core hoses and back flushed it first, the flushed the other way. Did this four times and finally got a bunch of crud to come out. Hooked the return line up, then used a funnel to fill the heater core until coolant started coming out of the block fitting. Started it up and within a few minutes had warm air then finally hot. Been driving it all winter without much heat, good thing it has heated seat.

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