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Best way to primarily fill and bleed air out of coolant on new engine?

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Old Jul 11, 2003 | 11:04 AM
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Best way to primarily fill and bleed air out of coolant on new engine?

What have you guys found to be the best way to do it?
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Old Jul 11, 2003 | 11:10 AM
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Disconnect the upper throttle body coolant line at the throttle body, that's the highest point in the system. Fill slowly until coolant comes out the pulled line, then reattach the line and warm up the motor. This works for me everytime and I never have to add more than a few cups afterwards.
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Old Jul 11, 2003 | 11:28 AM
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Originally posted by DamonB
Disconnect the upper throttle body coolant line at the throttle body, that's the highest point in the system. Fill slowly until coolant comes out the pulled line, then reattach the line and warm up the motor. This works for me everytime and I never have to add more than a few cups afterwards.
I think you mean this hose from the exploded view...

Last edited by johnchabin; Jul 11, 2003 at 11:33 AM.
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Old Jul 11, 2003 | 11:37 AM
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hmmm, ok, I have that one going directly to the rear of the engine as I have elimanted the coolant going through the throttle body... Should do the same thing though... Thanks I will try that.
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Old Jul 11, 2003 | 11:38 AM
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wait... the picture shows the hose that should be pulled should be on the rear of the engine, does it really matter which side of it is pulled?
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Old Jul 11, 2003 | 11:40 AM
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Originally posted by DamonB
Disconnect the upper throttle body coolant line at the throttle body, that's the highest point in the system. Fill slowly until coolant comes out the pulled line, then reattach the line and warm up the motor. This works for me everytime and I never have to add more than a few cups afterwards.
I find that if you use this same procedure, and jack up the drivers front a little bit, it works even better.
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Old Jul 11, 2003 | 11:46 AM
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Since DamonB made the original suggestion, he should probably verify the picture depicts what he had in mind...
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Old Jul 11, 2003 | 11:57 AM
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Originally posted by ejmack1
wait... the picture shows the hose that should be pulled should be on the rear of the engine, does it really matter which side of it is pulled?
The reason that you pull it it the throttle body is that it is the high point for the coolant. Removing the line at the other end defeats the purpose, and will not work.
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Old Jul 11, 2003 | 12:03 PM
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If you have an AST it does a pretty good job of getting the air out. I just fill, put caps on, squeeze upper radiator line a few times, remove caps and top off. Do this 2 or 3 times then run the car until it warms up. Let it cool off and top it off again. After that you probably shouldnt have to add anything.
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Old Jul 11, 2003 | 12:04 PM
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Originally posted by ejmack1
wait... the picture shows the hose that should be pulled should be on the rear of the engine, does it really matter which side of it is pulled?
The arrow points to the end of the hose that needs to be pulled. It's at the throttle body. It does look odd in the exploded view, but it's the only picture I had.
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Old Jul 11, 2003 | 12:36 PM
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Ok seeing that is not the highest point in my system, seeing i dont have a throttle body coolant line or an AST should i just pull the line off the back of the water pump, or the back of the engine?
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Old Jul 11, 2003 | 12:39 PM
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Yeah, the arrow is right. Disconnect it at the tb itself for the reason adam c explained.

Tom93R1, the ast does it's job but when the coolant is completely drained the system tends to trap air. For me even squeezing the rad lines doesn't get as much as opening the tb line. If I had my tb bypassed, I would imagine squeezing the rad lines is the best thing you could do. By doing it as described here you can get the far majority of air out before you even start the car though.
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Old Jul 11, 2003 | 01:17 PM
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From: San Luis Obispo, Ca
Originally posted by ejmack1
Ok seeing that is not the highest point in my system, seeing i dont have a throttle body coolant line or an AST should i just pull the line off the back of the water pump, or the back of the engine?
Which ever is the higher one. It will help to get some of the air out, but you will probably still have to "burp" your baby a few times.
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Old Jul 11, 2003 | 01:42 PM
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i think i agree wiv adam and damon... yes it is the highest point but there might still be some air traped in the radiator line so a win win situation...
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Old Jul 11, 2003 | 02:08 PM
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That's the correct hose. Just be careful to put it back on when you start burping the system. I made that mistake .... whoops ... there's goes a couple quarts of coolant all over the engine bay and onto the ground.

And I still burp the system about 3-4 times whenever I flush the coolant.
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Old Jul 11, 2003 | 02:44 PM
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From: MD
Originally posted by DamonB
Disconnect the upper throttle body coolant line at the throttle body, that's the highest point in the system. Fill slowly until coolant comes out the pulled line, then reattach the line and warm up the motor. This works for me everytime and I never have to add more than a few cups afterwards.
Yep, this method worked well for me too. Just remember to place it back on when you are done.
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Old Jul 11, 2003 | 06:35 PM
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To burp my car after using the disconnected TB coolant line technique, I parked my car and ran it on an incline (about 15-20 degrees) with the nose up and my coolant buzzer went off immediately. I shut the car off and refilled and the coolant buzzer didn't come on again. Also, be sure your overflow tank and AST are filled as well before burping.
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Old Jul 11, 2003 | 06:49 PM
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Here's the way the tech's do it. Go buy a coolant system funnel. It is a funnel with a speacial adapter to attach right on to your filler neck. It also comes with a long handled stopper (plug).

Take of your filler cap attach the funnel and then fill it half full of coolant mixture. Start your car and watch the funnel. Your t-stat will open as your car warms and you will see frothing bubble come up in the funnel and the half full funnel will empty some. This is how it removes the air without making a mess. Don't let your car warm up to much or the coolant will boil since the system can not pressurize. Shut off the engine let the car cool for a minute or two and then put the stopper in the funnel. and disconnect it from the car. Put the filler cap back on and you are good to go. FYI no matter what method you choose you will have to check your coolant by removing the filler cap the next morning for a few days and topping it of. (only a few table spoons worth for a few days) good luck any questions just ask.

I will try to find a link to that coolant funnel so you can see it.
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Old Jul 11, 2003 | 07:00 PM
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From: Edwards AFB, CA
http://www.matcotools.com/ProductImages/SFF2.jpg

here is a matco version. Mine is snap-on but it is the same.
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Old Jul 12, 2003 | 01:43 AM
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It is also a good idea to make sure the heater temp control is not shut off completely so the coolant will curculate through the heater and allow trapped air to escape.
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