Thursday, July 15, 2010 - 04:08 pm, by: Hakan Pasha(Hakanpasha)
Hi all,
From time to time I have been experiencing gurgling sounds coming from behind the dash ever since I've owned my Soarer. These would usually last a day or two, maximum a week, then disappear.
- Parking car on a steep road after a substantial time driving and heater on, front end up. Waited for the car to cool down so I can remove radiator cap safely and release any air bubbles that may exist.
I have looked for leaks in the engine bay as I am using Toyota red coolant so should be clear where the leaks are and there are none. Also looked for wet carpet due to heater core leak, nothing there too. I'm not experiencing coolant loss as I have checked the levels regularly and seem to be maintained. Overflow bottle levels are also constant. Ran a pressure test on the radiator and there is no pressure loss. Heater is working fine.
I have spoken to a mechanic who suggested that it might be BHG. Was going to do a leakdown test later on in the year but decided to do it sooner because of this problem.
Performed the leakdown test. No signs of significant leakage from any of the openings (oil filler, exhaust, cylinders etc, there were no air bubbles coming out from the radiator). Can't recall exact figures but all cylinders registered under 10% leak except Cyl 1, which registered 11%. Thought this was a bit odd so ran it again and obtained similar readings. Are these figures any cause for concern??
Ran the car on the freeway with heater switched on. Tried it with the free flow and recirculate settings, but the sound is still there.
The car is not showing signs of heating up quickly on start up or overheating over a long drive.
The only difference in the system that comes to mind since the last time this bubbling sound occurred is I have since replaced the radiator cap with a 1.1 (psi?), originally had 0.9. Could this have an effect?
I am stumped and out of ideas to try and determine what exactly is causing this problem and how to solve it. Only thing I can think of at this stage is running a Tee Kay test.
If anyone else has ideas, advice, tell me something I've missed or ignored or a solution to this problem it would be much appreciated and by anyone else that encounters this annoying problem.
Friday, July 16, 2010 - 09:24 am, by: Gary Poloskei(Mikrucio)
Hey mate
Changing the cap will will increase boiling point. which sounds good at first however Its not recommended because some components may not like running at the increased temperature.
First suggest you go buy a genuine cap from Toyota.
Also when you hear the sound STOP get out pop the bonnet. While it may sound like its coming from behind the dash. It could actually be coming from the engine side of the firewall.
I do know the Charcoal canisters make some funny sounds sometimes. I doubt its that but check it anyway.
Saturday, July 17, 2010 - 08:28 pm, by: Hakan Pasha(Hakanpasha)
Thanks for the reply Gary.
I've checked as you said the engine bay and charcoal canister for any noises and its definitely coming from in between the dash and engine bay, most likely the heater core. I guess there is air trapped in there and its sloshing around as I drive.
I managed to get my hands on a factory cap and put it on this morning. Will see if the situation improves.
I'll go for a freeway/highway drive later on and see if that helps drive the air out of the system.
Sunday, July 18, 2010 - 12:49 am, by: Aiden Cheese(Chillpen)
Gary Poloskei wrote on Friday, July 16, 2010 - 09:24 am:
Changing the cap will will increase boiling point.
But it won't force the system to be actually warmer right? Just because it's threshold isn't as high doesn't mean it will be.
That said the system will bleed itself under normal operation temperatures if it is able to expel liquid (and air) out of the system (through the radiator cap) and then as it cools it'll replace any lost air (or water) with the overflow water.
What you may have unintentionally done is created a situation where the increased pressure has stopped any fluid or air from being able to escape so it can only recirculate.
Monday, July 19, 2010 - 05:21 pm, by: Hakan Pasha(Hakanpasha)
Well, replacing the radiator cap back to factory specs has helped with reduced and less frequent bouts of sloshing noises.
Aiden Cheese wrote on Sunday, July 18, 2010 - 12:49 am:
What you may have unintentionally done is created a situation where the increased pressure has stopped any fluid or air from being able to escape so it can only recirculate.
I reckon you are spot on with this Aiden.
Although I think having the cooler climate in Melbourne at the moment isn't helping with driving the air out of the system. May need to wait for the warmer climate or is there another way?
Allan, I haven't tried those things and don't know whether I could as I don't know where the latter two are located within the car (bypassing should be ok). However, if it gets to that stage I will try those out.
Tuesday, June 04, 2013 - 04:50 pm, by: Ethan Rodda(Carbon_rod)
this forum is a bit different so i hope this doesn't resurrect this old thread from the graveyard. BUT! i recently flushed my system and replaced it with red nulon coolant and also replaced the cap with a 1.1 bar! then i started to get a weird noise! also noticed the hoses were super tight with pressure ready to explode.
replacing the old 0.9 bar cap helped and now there is no noise! just thought i'd add to this if anyone else has the problem and finds this!
Peter Nitschke Junk Filterer South Australia UZZ30 UZZ31
Where was the hissing noise from? Perhaps a leak that is more noticeable with higher pressure cap?
Nothing wrong with posting in old threads, Other forums have retards that complain when people post in old threads. I think it keeps more info in the same topic so its easier to find.
Monday, June 10, 2013 - 12:29 pm, by: Ethan Rodda(Carbon_rod)
no hissing noises, just bubbling and gurgling and when i felt the main hose from the top of the radiator it was solid as a rock, felt like it was going to pop.. put the old cap back on and it released air into the reservoir and also sucked liquid in from it to fill the airs place.
still some slight gurgling if you listen VERY closely, but i think i just need to do the park on a hill and release pressure trick i read on the forum somewhere.
Ian Johnston Goo Roo South Australia 1995 UZZ31, BA XR6Turbo Ute. 2007 VE GTS.
Monday, June 10, 2013 - 06:12 pm, by: Ethan Rodda(Carbon_rod)
yeah i know i had the wrong cap, the original one has 0.9 on it and the new one had 1.1 the 1.1 bar cap wasn't letting air pressure out, keeping air in the system, so it caused a pressure issue i guess
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