Coolant Vacuum Fillers Article - March car mechnics magazine

[The Great Pretender]

Interesting stuff - but I still don't understand the actual process involved.

If the 'empty' engine is evacuated using this device, there simply won't be any way I can think of that you'll get anything like a 100% vacuum in there, so there will still be potential air pockets. Also, if you vacate via the header tank and draw the fluid in through the bleed tube, what's to stop the coolant being drawn out the header tank after having only half-filled the engine jacket? How would this ensure that all the spaces have been filled?

I don't understand...

1 Do you accept that the air con needs to be evacuated before being re gassed?
2 Are you concerned that there is nowhere to bleed the air con?
I think most of us would answer yes to 1 and no to 2, does that help?

Dont worry...........be happy...........

[scanner]

Interesting stuff - but I still don't understand the actual process involved.

If the 'empty' engine is evacuated using this device, there simply won't be any way I can think of that you'll get anything like a 100% vacuum in there, so there will still be potential air pockets. Also, if you vacate via the header tank and draw the fluid in through the bleed tube, what's to stop the coolant being drawn out the header tank after having only half-filled the engine jacket? How would this ensure that all the spaces have been filled?

I don't understand...

1 Do you accept that the air con needs to be evacuated before being re gassed?
2 Are you concerned that there is nowhere to bleed the air con?
I think most of us would answer yes to 1 and no to 2, does that help?

Dont worry...........be happy...........

Air Con?

[The Great Pretender]

Sorry scanner..............equating air con to the cooling system...........

[The Great Pretender]

Sorry scanner..............equating air con to the cooling system........... ops

Treat the cooling system the same as the air con is what I meant

[Trouble at t'Mill]

Hey, man - less of the cryptic messages, huh?!

Are you saying that it does work by evacuating the coolant jacket to a near complete vacuum, and then coolant is drawn in? That's it? That'll work?

Cooool.

[scanner]

Hey, man - less of the cryptic messages, huh?!

Are you saying that it does work by evacuating the coolant jacket to a near complete vacuum, and then coolant is drawn in? That's it? That'll work?

Cooool.

That's how I read it - and that's why it says the hoses will go all flat and you have to leave it a while to see if there are any leaks - i.e. the hoses don't stay flat.

I guess that if you suck out (virtually) all the air and then allow only coolant in, it has to go everywhere (inc. the rear heater), as if it doesn't there will still be a vacuum - and as we all know from school physics "Nature abhors a vacuum".

[The Great Pretender]

From what I have read, using a vacuum pump you only need to bring the vacuum down to around 25" of Hg.