Flushing the Hijet

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Re: Flushing the Hijet

Post by CoolJet on Tue Aug 08, 2017 1:43 pm

The vacuum holds the water Inside if you dont release the cap. But when the system heats up there is pressure and it will also leak and maybe suck in some air on cool down. Inspection cover is behind the seats with a lot of 10mm and 12mm bolts.
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Re: Flushing the Hijet

Post by al kaline on Tue Aug 08, 2017 3:21 pm

Oooh okay thanks, I'm on it...

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Re: Flushing the Hijet

Post by al kaline on Tue Aug 08, 2017 6:05 pm

I can't really get a better visual with the inspection cover off.the leak coming from just above the circular inset bit.

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Re: Flushing the Hijet

Post by Raggy on Tue Aug 08, 2017 6:25 pm

Well that green thing is the water temp sensor so is it coming from there? Mine had a small leak at one time from there. Without looking myself can't say what's above it, maybe Woody when he sees this thread may be able to shed some light on it.
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Re: Flushing the Hijet

Post by al kaline on Tue Aug 08, 2017 6:32 pm

seems to be coming from behind those two bolts slightly to the left above the circle.

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Re: Flushing the Hijet

Post by Woodie on Tue Aug 08, 2017 10:12 pm

You have a rusty leaking core plug that needs replacing and a Cylinder block that needs to be pressure hose flushed out.

Rust from the cast iron block builds up at the bottom of the water jackets and rusts out the core plugs.
You need to make sure after flushing and fitting new core plugs that you run the engine 365 days of the year with Antifreeze mixture as it has a rust inhibitor in it.
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Re: Flushing the Hijet

Post by al kaline on Fri Aug 11, 2017 12:38 pm

Thanks for the diagnosis Woody, what im imagining is a couple of pairs of pliers and maybe a flat head screw driver will get the rusty plug out but just incase im wrong Is there any special procedure i should follow to get them out on the hijet?

Can i pressure hose flush the cylinder block whilst its all still in situ or (and im really hoping not) do i have to take the thing apart to do this...?

Does any one know the best place to get the best core plugs from?

a quick ebay search came up with these

http://www.ebay.co.uk/itm/SWAG-Frost-Core-Plug-Fits-CHEVROLET-MERCEDES-Ng-OPEL-Insignia-Mokka-5073860AA-/142462807295?fits=Model%3AHijet&hash=item212b71ecff:g:vEEAAOSwKJRZgG-x

Thanks again.


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Re: Flushing the Hijet

Post by Woodie on Fri Aug 11, 2017 2:06 pm

I find that the easiest way is to bang a screwdriver through the rusted part and gently lever it out. I can't quite picture in my mind how easy it is to get at the core plug in question. I would advise that you get a complete set and do them all. Also makes it easier to flush all the crud out of the block so long as you can get near to an outside tap or that you have a long hosepipe.
I am in the middle of a job fitting reversing sensors to a newish car at the moment so I must press on with that very carefully.

If you need some more information later on then Email me at : thehijetmaniow@gmail.com
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Re: Flushing the Hijet

Post by al kaline on Thu Aug 17, 2017 8:21 pm

While the plugs are on order with a while yet to wait for delivery, I sealed the leaking plug as a temp fix. Out driving she overheated quite badly. After then the matrix bleed was tougher - the coolant was coming out the heaters bleed nipple with much less of a gush than before. After short drives with no over heating you could still hear lots of air moving through the system. Then I woke up to a leaking radiator. Can this be fixed or do I need a new one??




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Re: Flushing the Hijet

Post by Raggy on Thu Aug 17, 2017 8:59 pm

Hmm don't like it he look of that fluid. What antifreeze is in there? Should be a pinkish colour. Are you sure it's leaking and it's not just water collected at the bottom from when you have bled/filled it? Had a similar scare and turned out it had just dripped there from a slip after topping up. Worthwhile drying off completely (I have a electric blower to clear it away) and checking again.
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Re: Flushing the Hijet

Post by al kaline Yesterday at 3:36 pm

Yeah you were right actually just coolant drippings from the bleeds! Embarassed

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Re: Flushing the Hijet

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