1hz bubbling in overflow and leaking from overflow

Joined
Jun 13, 2020
Messages
34
Location
perth wa
So what’s happening is it’s pumping water from my radiator to my overflow then leaking out of my overflow and also bubbling in there I replaced the rad rad cap thermostat had a tk test done not a cracked head apparently they sent very accurate anyway so took it an old boi who said u would smell the fuel in the diesel couldn’t smell anything nor was there crazy pressure in the top hose can’t be water pump it’s not a circulation problem and it’s also not leaking nor is it actually overheating my temp gauge reads fine and if it was overheating would be steam etc coming from my overflow I don’t think it’s the fan either cause again it’s not actually overheating but there’s a chance it could I’m gonna swap my fan with my mates and see what’s happens but I’m not hopeful I’ve had so many different people look at it no one can tell me a straight answer any info would be much appreciated cheers
 
Joined
Jul 22, 2003
Messages
18,901
Location
Perth Western Australia
Does it happen all the time or only hills etc? Still cool here, so the coolant system is not overloaded.
They tend to find their own level, so if you fill them right to the top they will pump a bit into the bottle. The bubbles are worrisome and I tend to agree with duncanrm on the head.
 

Nz Nath

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Joined
Dec 16, 2017
Messages
177
Location
Manawatu, North Island NZ
You could try a 3rd rad cap just in case your replacement was bad.

I had a Mitsubishi ute that did the same, pretty sure the head was cracked, but I never checked. I drove it for 6 months like that, I’d tip the overflow back into the rad everyday before driving home from work.
 

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