LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Im bleeding the coolant and.....

Old Jun 17, 2006 | 05:42 PM
  #1  
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Im bleeding the coolant and.....

i was bleeding the system for the 3rd time and this time a lot of air was coming from the bleeders until my temp hit 250 or so , then i shut down the engine and the beeder was still blowing a lot of air and after 2 min or so it stoped, so i turn on the engine and bleed again and coolant came out , so i opened the other bleeder and coolant came out too. but my temp was still high.
the weird thing is that this was the 3rd time bleeding it and it never took so long to get the air out.

am i bleeding it wrong? this is what i do, i start the engine and wait till 210 temp and open the passanger side bleeder untill coolant comes out and then i open the TB bleeder till coolant comes out. the shut it down and wait for engine to be cooler (160-180) and do it all over again.

where do i put the coolant in? in the part where u check the coolant or radiator?

i do the bleeders separately cuz im afraid of the dam opti getting wet.
Old Jun 17, 2006 | 06:11 PM
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Re: Im bleeding the coolant and.....

help me out plz
Old Jun 17, 2006 | 06:43 PM
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Re: Im bleeding the coolant and.....

i put the coolant in the cap that says engine coolant only, and it waas fine can anyone confirm this?
Old Jun 17, 2006 | 07:45 PM
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Re: Im bleeding the coolant and.....

Originally Posted by cridom
i put the coolant in the cap that says engine coolant only, and it waas fine can anyone confirm this?
check and fill at the radiator cap

remove the cap when the engine is cool, top off, leave cap off, start engine, then do everything you were doing, keep the radiator full, some coolant might come out of the radiator, don't worry
Old Jun 17, 2006 | 08:18 PM
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Re: Im bleeding the coolant and.....

lemme check if i understood. so i go and check my coolant lvl at the ¨engine coolant only¨ and see if the bars are near the cold one, if ot i should open the radiator cap and fill it to the top? then leave it open and use the bleeders and fill the radiator when the coolant goes down and do this over and over untill radiator is full to the top? or what is the level it should be when hot?
Old Jun 17, 2006 | 08:31 PM
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Re: Im bleeding the coolant and.....

i did this:
open the radiator cap. fill, shake car side to side until i can't add any more. start car. re-fill radiator. fill radiator...fill again...keep going until the thermostat kicks in and starts moving really fast. replace cap. fill reservoir to "hot" level. let engine cool and soak up all the fluid it needs. next time the engine's cool, open the cap and fill till it spills. top off the reservoir again and it's done.
Old Jun 17, 2006 | 09:51 PM
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Re: Im bleeding the coolant and.....

The easiest way to bleed the system is as follows. I've done around 50 this way and it works well.

Get a funnel that will fit tightly (seal) in the radiator opening. This is key to making everything work.

Fill coolant reservoir. Fill the radiator as usual with the bleeder screw open. This will purge most air. Close bleeder & top off. Now push the funnel in tightly in the radiator & put a few inches of coolant in the funnel so it is well above the top of the radiator.

Now open bleeder & it will force the air out because of the increased fluid height in the funnel. You will waste some coolant & spill a little, but it is far easier. Close bleeders, fill to top if necessary (if you put enough in the funnel to begin with it should overflow when you remove it) & put on rad cap.

Now start the car & let it warm up. It should build some pressure & not overheat.

Shut off engine & crack each bleeder again to let out any additional air. There should be very little if you did it right. The pressure will force it out.

You can run it one more time & recheck to be sure.

Starting the car before bleeding the system can overheat the heads due to an airlock in there.... the t-stat does not react well to an air pocket next to it. I do not recommend running the car before the system is completely bled for this reason.
Old May 31, 2009 | 05:55 PM
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Originally Posted by Lonnie Pavtis
The easiest way to bleed the system is as follows. I've done around 50 this way and it works well.

Get a funnel that will fit tightly (seal) in the radiator opening. This is key to making everything work.

Fill coolant reservoir. Fill the radiator as usual with the bleeder screw open. This will purge most air. Close bleeder & top off. Now push the funnel in tightly in the radiator & put a few inches of coolant in the funnel so it is well above the top of the radiator.

Now open bleeder & it will force the air out because of the increased fluid height in the funnel. You will waste some coolant & spill a little, but it is far easier. Close bleeders, fill to top if necessary (if you put enough in the funnel to begin with it should overflow when you remove it) & put on rad cap.

Now start the car & let it warm up. It should build some pressure & not overheat.

Shut off engine & crack each bleeder again to let out any additional air. There should be very little if you did it right. The pressure will force it out.

You can run it one more time & recheck to be sure.

Starting the car before bleeding the system can overheat the heads due to an airlock in there.... the t-stat does not react well to an air pocket next to it. I do not recommend running the car before the system is completely bled for this reason.
o know old thread. but what happens if you do run the car before bleeding and it does over heat and makes an air pocket or airlock? will it go away when it cools and you can bleed it normally?
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