Lexus GS 2006-11 :: Steam Bubbles / Fan Is Noisy / Revving Engine Shoots Out Water
Dec 29, 2015
I purchased a second used 2006 GS300 from an ex colleague.
I've put about 5,000KM on the car, it currently has 195,000KM.
The car is/was mechanically great, until this week when I had some cooling issues..
First sign of problems was when I noticed steam bubbles in the expansion tank after the engine was turned off. I was actually filling up with oil as the oil warning light came on - 2nd time in 5000km but I guess that's normal for a car of this performance, size and age. I hadn't noticed overheating sings at this point but I remember fans being generally noisy (In SA it's in the height of summer so I didn't think much of it).
Temperature seems to be rock solid in the middle of the gauge, something I noticed as it gets very hot here and traffic is sometimes quite bad.
The next day I had been driving about 15 minutes on the motorway and I noticed the temperature gauge was suddenly in the red. I pulled over, noticed expansion was empty and filled. Decided to carry on another 5 mins as I had 2 small kids in the car and it's not a safe place to be (side of the motorway).
I finally found the radiator cap after I was recovered home and filled up with water (appeared to be very empty).
Next day little loss in expansion tank, low miles driven.
Next day needed to drive out a little further, about 50KM later the temp gauge started flipping hot then in the middle, hot then middle and then the engine warning light came on and the stability control light came on!
I was carrying water so filled up quite a lot of water again and the car started up perfectly and I returned home.
Since then I've been trying to investigate the problem, I will bullet point finding...
no obvious leaks
no oil in water / water in oil
no apparent general overheating (except the 2 times with water loss)
AC and heating working perfectly
no performance loss
driving lightly, up to temp no steam bubbles in tank w/ engine off
driving heavy at working temp leads to steam bubbles even when off
replaced radiator cap - no change
Radiator cap off and engine running cold, small water movement with a light sucking/bubbling - seems like air is sucked in every 10 seconds or so (very small volume of air into a tine whirlpool then air bubbles back). This I paid attention to, it settled down when engine heated up. Revving engine shoots water out of radiator - noticed when trying to get temperature up, I believe this is just the pump spinning up and normal.
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I brought it in 2 times to have the dealer check it out, but they would said its "normal" and that the high pressure injectors and fuel pump are loud on our 3GS.
So i was wondering to try using heat wrap to try to reduce the noise from the fuel pump. It seems like the fuel pump is making the most noise.
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My '06 GS450h has developed a fault where the heater blows cold at idle and low revs but blows warm when driving or revving the engine at a standstill. The coolant hasn't dropped at all and the car never goes above halfway on the temp gauge. Its starting to get frustrating now the cold weather has set in and temps dropping! Long journeys are ok as at high speeds it stays warm but short journeys are uncomfortable!
I just had a feel of the rad hoses and hoses that go into the matrix (engine side of bulk head) and matrix hoses feel warm (both of them), the top hose to the rad is warm but not hot and bottom hose is cold suggesting the stat hasn't opened yet. Its cold outside so getting the car up to temp is quite difficult without a long drive (rush hour at the mo).
Still I just had the car parked on the drive and cranked the heater up to max and held the accelerator for a while and super warm air blows out. The engine cuts back out as "normal operating temp" has been reached for battery mode and then the heater goes cool again! Still the bottom radiator hose is cool and top hose not massively warm. It has never overheated thus far and I drive 150miles a day back and forth to Reading from Cheltenham 4 nights a week.
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They ran the diagnostic and it said there was issue with a cylinder misfire. And after some more tests it led them to replace the engine coil. They drove it 5 miles and believed it corrected the issue. That evening after work when the shuttle came to pick me up, I drove the car home and no issues what so ever. Car actually seemed to be getting up to speed better than before. (car is automatic).
The issue, this morning when starting the car and getting ready for work, I hear a weird noise when starting the car, revving the engine, and getting up to speed. It is not a ticking noise, I would describe it more as a rattle but that doesn't even describe it real well.
They also did an oil change. I bought the car brand new, and have never had any issues and religiously get oil changed by dealership every 3 months.
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Photos are attached...
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