how do you bleed coolant

gezzar · Post by **gezzar** » Wed Apr 20, 2011 6:20 pm

Hi all again thanks for all your help with the knock sensor put one on all good ,Got a different problem this time can hear coolant behind the glove box in the heater i think a air lock have tryed to bleed but dont seem to get rid off the coolant noise like rushing water hope theres a answer as this is getting on me nerves lol

H-top · Post by **H-top** » Wed Apr 20, 2011 6:31 pm

Have u run it with the heater on?

Post by **TOONGA** » Wed Apr 20, 2011 9:09 pm

1 park the car on a hill, so the engine facing up the hill

2 carefully remove the radiator cap, if the engine is hot wait untill it cools a down bit before you open the cap.

3 start the engine and get it to running temperature

4 wait for the air lock to bubble its way out of the engine, you may have to rev the engine to make the water circulate better

5 top up the coolant in the radiator once the airlock had come out, making sure that it is filled up to the top.

6 replace the cap making sure the over flow bottle has coolant in it as well and then go for a drive

the noise should be gone

TOONGA

YouTube · Post by **El_Freddo** » Wed Apr 20, 2011 10:02 pm

On top of what Toonga has said - the drive should be a good one for a bit of time, not just around the block. Cruising is good, a hill climb would be better

Cheers

Bennie

rebuilder · Post by **rebuilder** » Thu Apr 21, 2011 7:07 pm

beleive it or not, the reservoir also has to be full. its not just a cathment for overflowing coolant, it also gets sucked back into the radiator when the engine gets hot for the first time since a coolant change! During the first heat cycle, all the chambers around the cylinders which were otherwise impossible to bleed, get hot and turn gradually bleed out along with coolant, and when that air pocket makes its way to the top of the radiator, it is replaced with coolant, as the compressed hot air opens the rad/cap.

RSR 555 · Post by **RSR 555** » Thu Apr 21, 2011 9:56 pm

Like Jules (TOONGA) has mentioned.. I use a hoist to raise the car as high as possible and then using a funnel.. I use one of these (http://www.askmehelpdesk.com/attachment ... .jpg?stc=1) but I've heard of others using a cut down 2L Coke bottle, then fill halfway and let the engine run until the fans come on then turn off. Turn car off and leave funnel in until engine has cooled down, then refit rad car and fill overflow bottle only to the full line and monitor for a few days.

gezzar · Post by **gezzar** » Fri Apr 22, 2011 6:23 pm

Thanks for all your advise but have tried all off these but dont seem to shift the air lock .

RSR 555 · Post by **RSR 555** » Sat Apr 23, 2011 2:14 am

2 reasons then why it is still gurgling is..

1. Heater core is partial block

2. Head Gasket is leaking

gezzar · Post by **gezzar** » Sat Apr 23, 2011 10:25 pm

many thanks dont think the head gasket as dont have any coolant loss or overheating probs .May be heater core fault ?? will try and flush

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how do you bleed coolant

how do you bleed coolant

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