TheWizard

My wife and I both drive 2014 GS350 F-sports. Both of our cars have developed this same coolant problem. See picture. There is an extremely minor coolant leak at the reservoir cap. The reservoir always measures full, so it's not a measurable leak. This "leak" is annoying. I've tried re-positioning the cap, cleaning the cap etc....same annoying leak.

A while back I could have sworn I read a thread about this being a common issue and that Lexus is aware of it and has issued/made a new reservoir cap. Anyone know what I'm talking about? Anyone else experiencing this issue lately? Anyone have a replacement reservoir cap part number? Please share if you do, I would greatly appreciate it.

bigblack06

iTrader: (20)

That would be news to me but when I had the 4GS this happened a lot, I used to just clean it up. If there is an update I have not seen it on the TSIB list.

richard203

iTrader: (1)

heard people just bring it back and get an updated cap.

AJLex19

@TheWizard its a bad cap. See this thread for more info: https://www.clublexus.com/forums/gs-...rvoir-cap.html

er34

The thing is, it's not supposed to be at the full mark when the car is cold. The full line is when the car is at operating temp.

TheWizard

Well damn. This should be a TSB. Thanks for your response.

I could, but the last thing I want to do (twice!) is spend 2-3 hours in drive time and time spent at the dealership when I can do this myself in 2 seconds. I live 40 minutes away from the nearest dealer. I'd rather pay for the part and be done with it.

Good find, that's probably the thread I remember reading. Unfortunately, the revised part number wasn't stated.



I called Lexus and spoke to a dude in the parts department. There is no evidence of a new part number or superseded part number for the cap. Then I asked to be transferred to the Service Department. Dude tells me that this problem is common on many Lexus models and is mostly reported during the summer months. He believes that if I brought the car in, they would simply replace the cap and hope for the best.

jonathancl

I looked up my 2013, and it lists 16405-31140 (new version) as an updated replacement for 16405-31110 (old version).

Edit: 2013 w 80k mi. Easier to just order it: $15 shipped from mylparts.

ItzFilyO

It was probably just defective, just bring it in and have them replace it and u will most likely get the newer version.

TheWizard

Thank you very much Jonathan, much appreciated. I plan to order 2 of these caps and will report back my results.
Only $10 each.

jonathancl

Updated version installed. Original placed beside.

I like the bend: it’s funky. It was hard to snap the cap on, very tight. Will update in six months, see if we get any pink cheese.

TheWizard

Jonathan, thanks for posting a great picture and describing how it's a tighter fit. My new caps are arriving next week. Thanks again.