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Lexus ISF coolant leaks/frequent low level


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Hi, not sure of this has been covered or asked before but i seem to be topping up my coolant frequently every week. Only reason I noticed the problem was when my car wouldn't provide heating when car idling, this is going back 5/6 years ago now after i had all the recall work done. I keep telling the garage that i have this problem but they say it's normal to lose a little coolant and it could be an air lock.

Well i was getting exhaust work done and i noticed coolant on the underside of my car....i'm now convinced there is a leak and surely Lexus surely should have picked this up on a service/vehicle check as they definitely look under the car to inspect! I've sent them an email now and see what they say but i'm unsure if anyone else has had this problem?

I have attached photos i took while the car was up in the air.

image1.jpeg

image0-6.jpeg

IMG_2257.jpg

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Hey man, long time no speak. Get your Rad changed ASAP………. It’s a known weakness and to prevent anything worse happening get it done.

it could be the valley plate leak but you will see coolant near the head up top.

I suspect the rad is leaking from the join on the underside.

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From reading around, if heating is lost and the coolant is dripping down the transmission bell housing, which it looks like it is on image 2, it's usually the valley plate leaking. 

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Every week is not right, where are you having it serviced ? They should have picked that leak up. Check under your engine cover to see if you can see that pink liquid stain on the valley between the heads.

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7 hours ago, Arqum said:

Hey man, long time no speak. Get your Rad changed ASAP………. It’s a known weakness and to prevent anything worse happening get it done.

it could be the valley plate leak but you will see coolant near the head up top.

I suspect the rad is leaking from the join on the underside.

Hey man yeh long time indeed!

I got the rad changed the first time I saw it was leaking down the radiator etc.. they did that FOC as they damaged it when replacing the water pump!

this time I’m getting it leaking underneath and nothing from top is visible! 

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5 hours ago, Charliecloud said:

Every week is not right, where are you having it serviced ? They should have picked that leak up. Check under your engine cover to see if you can see that pink liquid stain on the valley between the heads.

I get it serviced at Tunbridge Wells. And for years I’ve been telling them yet they said nothing is wrong, that it’s normal etc… only at the weekend I finally saw underneath the car to notice the leak. 
 

I’ve read a lot about valley plate on the American forums. Seems like it affects a lot of owners. Also I heard about it could be a cracked manifold?! I hope not! 

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I doubt its the manifold which will cause a leak.

Could be that the coolant as just aged and started rotting the new pipes of the rad? Get them to source the leak if its a rad get it changed asap i wouldnt drive the car to be on the safe side.

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3 minutes ago, BTCC_ Racer said:

I doubt its the manifold which will cause a leak.

Could be that the coolant as just aged and started rotting the new pipes of the rad? Get them to source the leak if its a rad get it changed asap i wouldnt drive the car to be on the safe side.

Haha bit late for that I’ve been driving it for about 4 years with this problem 😂 Lexus kept telling me it’s an air lock due to the new radiator fitted. I’ve contacted them and they will investigate. I’m inclined to think it’s a valley plate issue. 

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Fairplay - keep us updated, im fairly new to the ownership of a ISF. First thing i did was got the manifolds welded and changed the Rad.

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6 hours ago, BTCC_ Racer said:

Fairplay - keep us updated, im fairly new to the ownership of a ISF. First thing i did was got the manifolds welded and changed the Rad.

I will definitely keep you updated. Seems to be a fairly common problem in the states.

Also welding the manifolds was a good shout, where did you get this done and how much did it set you back if you don't mind my asking?

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On 5/17/2022 at 1:33 PM, simranjit Jhita said:

I’ve read a lot about valley plate on the American forums. Seems like it affects a lot of owners.

A lot of American owners, the valley plate issue is related to issues with the north American climate and the sealant Toyota use on the 2UR-GSE valley plate, which were obviously never identified during the cars development in Japan, it's not really something you have to worry about in Europe (or at least the UK) unless you're super unlucky.

 

On 5/17/2022 at 1:41 PM, simranjit Jhita said:

Haha bit late for that I’ve been driving it for about 4 years with this problem 😂 Lexus kept telling me it’s an air lock due to the new radiator fitted. I’ve contacted them and they will investigate. I’m inclined to think it’s a valley plate issue. 

If I've read the thread right you say you originally say the radiator leaking after getting a new water pump fitted and they replaced the radiator for free because they damaged it changing your water pump, but after this you still had a leak just not from the radiator and this has been going on for years now.  Is it possible that the new water pump was never sealed properly and has been leaking slightly ever since? If they damaged the radiator when reinstalling it then a leak from the pump would probably have been masked by the leaking rad when they replaced the rad.

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On 5/17/2022 at 8:26 PM, simranjit Jhita said:

I will definitely keep you updated. Seems to be a fairly common problem in the states.

Also welding the manifolds was a good shout, where did you get this done and how much did it set you back if you don't mind my asking?

I used a Toyota specialist it wasnt cheap but I had the work carried out along side a full service, all fluids changed, new brakes, and a few more bits and pieces. 

 

The garage is based in Manchester.

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On 5/22/2022 at 12:47 AM, ubersonic said:

A lot of American owners, the valley plate issue is related to issues with the north American climate and the sealant Toyota use on the 2UR-GSE valley plate, which were obviously never identified during the cars development in Japan, it's not really something you have to worry about in Europe (or at least the UK) unless you're super unlucky.

 

If I've read the thread right you say you originally say the radiator leaking after getting a new water pump fitted and they replaced the radiator for free because they damaged it changing your water pump, but after this you still had a leak just not from the radiator and this has been going on for years now.  Is it possible that the new water pump was never sealed properly and has been leaking slightly ever since? If they damaged the radiator when reinstalling it then a leak from the pump would probably have been masked by the leaking rad when they replaced the rad.

Ahh i hope so, banking on it being a relatively simple solution as the water pump seal rather than valley plate issue, either way i'm very disappointed with Lexus Tunbridge Wells as they have effectively been selling it as a simple air lock, and consuming coolant over time is normal behaviour. I've booked it in for them to look at next week.

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