Author Topic: Flushing cooling system  (Read 2423 times)

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Dukes426

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Flushing cooling system
« on: December 23, 2020, 10:16:58 AM »
Hi all,
I have been slowly chipping away at my GTV and one of the other things I would like to do is flush the cooling system. I have removed the radiator that was leaking and crap and have sourced another original one that has been pressure tested and checked and ready to go in.
Before I do this though, I would like to flush the block. I already have a new water pump in it.
Is it just a matter of sticking a hose in where the thermostat goes and letting the water flow out of the water pump (that hasnít got hoses connected yet)? Is there something else on the exhaust side of the block that needs to be undone to let the water flow out of?
Thanks again for all your help guys.
Regards
Dave

GTVeloce

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Re: Flushing cooling system
« Reply #1 on: December 23, 2020, 12:06:25 PM »
There's a bolt behind the exhaust manifold near cylinder 4. I'd flush from the front and drain via the rear.

Dukes426

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Re: Flushing cooling system
« Reply #2 on: December 23, 2020, 01:07:34 PM »
Thanks GTVeloce.
So in from where the thermostat is and the water will flow out from the bolt you mentioned? Will water also come out from the water pump?
Have been wanting to do this for ages!
I also bought some penrite demineralised water (for when itís all been flushed properly) and penrite radiator flush to put through the system but wanted to do a flush with the hose first before reinstalling radiator etc.
I was also thinking of getting one of those TEFBA filters that go on the top radiator hose - what does everyone think of them?
Thanks again for your help - much appreciated!

sportiva

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Re: Flushing cooling system
« Reply #3 on: December 23, 2020, 04:33:56 PM »
It does not hurt to flush from both directions, a reverse flush can remove contaminants the forward flush missed.
Think of water flow around a bridge pilon the inward tide cleans it in one direction the outward tide washes the other side.
You might want to remove the thermostat and then flush as the stat will close with cold water.
« Last Edit: December 23, 2020, 04:40:55 PM by sportiva »
3.0 GTV6 Fiat Free
156JTS

ex
75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted
156 sele

Dukes426

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Re: Flushing cooling system
« Reply #4 on: December 23, 2020, 10:17:06 PM »
Thanks Sportiva.
The car isnít running at the moment as itís getting work done on it and it has the thermostat removed (I have it blocked up with a rag at the moment and a new thermostat ready to go in) and no radiator.
When you say both directions, what do you mean? I was thinking putting the hose in where the thermostat goes and flushing the block that way. What other way do you mean?
Sorry for my amateur questions - Iím really keen to learn.
Thank you again for your tips and advice - really appreciate it.

sportiva

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Re: Flushing cooling system
« Reply #5 on: December 24, 2020, 01:59:49 PM »
In through the thermostat out the water pump or in through the pump out via the thermo or in or out through the block drain hole.
3.0 GTV6 Fiat Free
156JTS

ex
75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted
156 sele

Dukes426

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Re: Flushing cooling system
« Reply #6 on: December 24, 2020, 02:28:58 PM »
Got it!!
Thanks for that - will give it a go on the weekend.