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Post Posted: Fri Oct 04, 2019 10:46 am 
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It seems my overflow bottle is refusing to drain back into the radiator.
So far replaced rad cap, heater hoses, pipe into rear of water pump, overflow bottle (and hoses), genuine thermostat, radiator

Before you say head gasket, im wondering if the heater tap could be loosing me some pressure. There is no coolant loss, no bubbles or overheating. Quite simply it just refuses to drain back.
It is a reconditioned engine

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Post Posted: Fri Oct 04, 2019 11:11 am 
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I vote you have an air pocket somewhere.

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Vehicle: Suzuki sierras

Post Posted: Fri Oct 04, 2019 11:13 am 
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G'day MrRocky don't know about the heater tap but my sierra was doing this and i replaced the head gasket and it started reterning back to the radiator, sorry i cant be more help.
Cheers Jack.

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Post Posted: Fri Oct 04, 2019 1:15 pm 
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Jacked the front and gave the rad a good burping as well as cracking a few hoses. Will see how that goes

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Vehicle: '92 Sierra, 1.6efi, SPOA, 31s.

Post Posted: Fri Oct 04, 2019 9:06 pm 
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Smell the coolant in the overflow... mine managed to bridge the head gasket between cyl 2 & 3 from a coolant valley to an exhaust one. So the coolant was getting pressurised with exhaust and smelt like fumes.

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Location: Georgetown, Guyana
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Post Posted: Sat Oct 05, 2019 3:34 am 
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A leak anywhere in the system can cause it not to develop the vacuum needed to draw the coolant back - in my case, the leak was a hairline crack in the overflow bottle cap.

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Post Posted: Mon Oct 07, 2019 4:33 pm 
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Bypassed heater tap and heater core.
Issue is now sorted. Well at least for the summer.
Mind boggling there was zero coolant leaks but still enough of a pressure leak to empty the top rad tank and fill the overflow then not drain back.

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Post Posted: Tue Oct 15, 2019 9:23 am 
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Well after blocking off the heater core/tap the coolant drains back but pushes a heap of coolant out the overflow even when car is below operating temp after cold start. Im thinking maybe radiator is blocked? Car has sat for a long time.

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Post Posted: Wed Oct 16, 2019 10:59 pm 
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Got a spare to try? I’ve got a good one here if you need it

I’m still suspicious of head gasket.

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Post Posted: Thu Oct 17, 2019 6:49 am 
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Head gasket.

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Post Posted: Thu Oct 17, 2019 2:23 pm 
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Ok so i pulled out my new genuine thermostat and the toggle/hole was letting next to nothing through when cold, really was miniscule. Maybe i got the wrong genuine item. Ive removed the toggle and drilled out the hole to 3mm. Seems to have made a substantial difference, need more seat time to confirm

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Post Posted: Sat Oct 19, 2019 7:06 pm 
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Ugggghhhh :deadhorse:


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Post Posted: Wed Oct 23, 2019 11:58 am 
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Bugger.
"Well there's your problem"

Hope all goes well.

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Post Posted: Wed Oct 23, 2019 1:04 pm 
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Next time people give me a hard time when I say g motors don’t recondition well.....

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hillbilly 2 wrote:
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Post Posted: Wed Oct 23, 2019 2:26 pm 
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Motor was rebuilt 10yrs ago with new head/rockers ect...
Only done a couple thousand kms but gasket was toast. Cleaned up and added some extra ft lbs on the tighten up so should last a few more years.

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Post Posted: Wed Oct 23, 2019 2:31 pm 
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Running much better now


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Post Posted: Wed Oct 23, 2019 9:56 pm 
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Running much better *for* now.

Fixed it for you.

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Post Posted: Wed Oct 23, 2019 11:47 pm 
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:thefinger: :thefinger: :thefinger:

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Post Posted: Thu Oct 24, 2019 11:22 am 
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303zuke wrote:
Running much better *for* now.

Fixed it for you.


Isn't this the standard response for anything G series?

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Post Posted: Thu Oct 24, 2019 9:00 pm 
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Ahhh but if a 1.3 sierra and a jimny had a race would jimnys still be shit offroad...

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Post Posted: Fri Oct 25, 2019 11:14 am 
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MrRocky wrote:
Ahhh but if a 1.3 sierra and a jimny had a race would jimnys still be shit offroad...


of course :deadhorse:

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