Lexus GS 2006-11 :: GS430 - Coolant From Radiator Blowing Back And Causing Reservoir To Be Overfilled
Apr 15, 2015
I have a 2006 Lexus GS430 w/ 100k miles. I've been trying to solve my coolant issue for the longest and I've been doing research like crazy!!! The issue that I'm having is that coolant from the radiator is blowing back into the reservoir causing the reservoir to be overfilled and splattering all over the engine bay. Also, when this happens the fluid in the radiator drops significantly ( I have to keep dumping the lost coolant from the reservoir back into the radiator). Under normal driving the fluid wont blow over to the reservoir that much (just a little) but, when I drive long distances or if I floor it that is when the coolant from the radiator really pushes over into the reservoir. When the car cools, I find out that the coolant from the reservoir does not draw back into the radiator. (I'm guessing due to the air in the cooling system?)
Checklist on what has been done to the car:
- NEW Water Pump (Installed by Lexus)
- NEW Timing Belt (Installed by Lexus)
- NEW Thermostat (Installed by Lexus) (I also tested the thermostat in boiling water and it opened and closed)
- NEW Radiator (Installed by Lexus also was pressure tested and passed)
- NEW Radiator Cap (Genuine Toyota 1.1 bar)
- Coolant Flush (flushed radiator and engine block with water hose)
-Bled System with my Lisle Spill Free Funnel and Heater on MAX HOT Full blast! Heater is working good!
(Did this 3 times for 30 min+ to get rid off all the air bubbles)
- Performed a Block Test to see if any combustion gasses were in the cooling system, to determine if it was a blown/failing head gasket (passed)
I dont know what else to do at this point other then do a compression test and a leak down test. There is no coolant in the oil and no coolant leaks. Car drives solid and strong! Is there a bleeder valve on the GS430 somewhere or does it have a bleeder valve? Is it something I'm doing wrong?
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When the car has been running awhile the coolant reservior and radiator make a boiling sound. It really only does it when it's been at idle for a bit. Radiator is full. Fan doesn't seem to come on after it has been running awhile but does when you turn on air. At what temp should it come on? The temp gauge never goes above the middle point so it stays in normal range, even when the tank are radiator are gurgling.
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My 2000 Accent with 164,000km is not overheating but is dumping coolant into the reservoir so that the radiator is about a quart low. I did have a few problems with it overheating in the past month, but that was solved by thermostat removal (always above 80F here). I stopped before the overheats reached the redline and allowed the engine to cool before continuing, no known adverse performance during the overheats. No water in oil.
Failed troubleshooting:
Drained and replaced coolant x3
New radiator cap
* No thermostat.
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After 3 hour trip, checked engine compartment again. This time the reservoir was totally empty (radiator still full) and the engine was well sprayed with greenish coolant residue. The radiator was cool by the time I checked it, so the leak source wasn't obvious, but it looks to be coming from the seam where the plastic top meets the aluminum.
I will replace the radiator when I get home, but first have to drive the 3-hour return trip. Will it be OK as long as I start full of coolant and keep an eye on the temp gauge?
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I have a 2007 Prius, my coolant is always overflowing to my reservoir. It doesn't have any overheating problem, if I will fill up the radiator I could see bubbles coming out, How can I resolve this problem?
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I checked the coolant level on the reservoir and it was low.
I decided to add coolant by removing the radiator pressure cap, however, the coolant fluid is full under this cap.
So my question is where should I add coolant? through this cap or the reservoir?
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Guys, i have a 2006 GS430 with around 119k miles...Last night when i started the car and turned on the Fan, Strong Gas smell started to seep in through the Vents, At first i didn't really think much off the smell...Drove home (about 2 miles) and then Opened the hood while car still running.
There is this black round piece that sits on the Fuel pressure line (Or atleast that's what it seems) it's completely soaked in GAS (Petrol), i need to know what this part is called.
Is it Fuel Pressure regulator? if it's fuel pressure regulator is it easy to replace?
Here is the picture that was just taken (Upon starting the car)....
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I have a 2006 GS 430.
Absolutely love the car, however I do have a new issue with my headlights. Pretty much every time I drive at night, the headlights will both come on and then one will go off at some point. They almost always both come on, and then usually the left will go out while driving.
It doesn't happen necessarily immediately. Sometimes 2-3 minutes later, sometimes 20 min, sometimes they work fine. I took it to a local shop and they said the whole assembly needs to be replaced on each side. (Parts alone $1200/each side) and apparently the bumper needs to come off. Seems a little ridiculous to me.
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I have 2001 Nissan Xterra SE 3.3L V6. A few weeks ago my car started to overheat while going through the grapevine (mountain pass in SoCal). After filling it up with coolant, I took it to the shop. They couldn't figure out what exactly was the problem. It passed the block test and such. They said the top hose was swelling up as if something was blocking it. They also said my car was going through about a gallon of coolant. They replaced the water pump, thermostat, and the top hose. they also replaced the timing belt.
After driving the car for an hour, it started to overheat again. This time, I took it to the Nissan dealership. They said the timing belt was off by 2 teeth and they think that's why it overheated, so they fixed that problem. They also did a cooling system test and found no leaks.
I got the car back and it still overheats. After the turn off the car, I see coolant being bubbling back into the reservoir almost to the top. Also, my radiator was replaced about a year ago.
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About 3 weeks ago i have noticed that the right headlight doesn't work. I assumed its the bulb and bought a set from kbcarstuff. Installed them today and it still doesn't work. I tried to swap the bulbs and non of them worked in the right headlight and all of them worked fine in the left one. I assumed it is a fuse and went to check it out(number 80 and 81 fuses, 15A are all sweet). Is it the ballast or something also?
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Tons of information on this and its possible. What? I'm still learning the search feature.
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How to fix the low speed brake squeal on my GS. I have an o6 with about 80K on it. Have had it for four years and never winter driven. I am debating trading it off on an AWD GS or putting it into full time service as my year round driver.
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Have any of you used your GS430s in regular winter driving, heavy snow and ice. How to get it to perform its best in deep snow or very slippery roads?
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I have a 2007 GS 430, 126,000 miles. Initially I had one faulty headlight that would not work but after turning the switch off/on, it would work again. Eventually both headlights started malfunctioning. After reading other forums, we elected to change the headlight bulbs. So far that has worked. However, after changing the bulbs, the VSC (Vehicle Stability Control) and check engine lights came on. After running the headlights and using the car to go to/from work with about 4 stops and restarts, the car reset itself and the warning lights turned off. Scared me at first because I had also just had suspension work done. However, the Headlamp Level Control System is part of the VSC system, which makes sense, just wasn't prepared for the warning lights.
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