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Joined: Thu Dec 17, 2009 11:00 pm
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Location: perth

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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Joined: Thu Feb 26, 2009 11:00 pm
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Location: Melbourne

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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Joined: Mon Jul 08, 2019 10:27 am
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Vehicle: Suzuki sj70 swb

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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Joined: Wed Mar 24, 2010 11:00 pm
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Location: Perth
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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Joined: Tue Apr 20, 2010 12:00 am
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Location: Georgetown, Guyana
Vehicle: 98 5 dr SQ420, 05 5dr JB420

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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