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Old 11-01-2018, 03:32 AM   #1
NorthernGirl
 
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Radiator Cap - 1.1 bar or 0.9?

Hello everyone,
I own a 2009 Yaris LE 1,5L hatchback. She was in a accident recently - long story short, everything is fine by now and she runs like nothing happened
But a radiator cap is scratched, so I decide to change it. The thing is, the current one is 0.9 bar. I ordered a OEM new one (and received it already). The seller put in my order a 1.1 cap, instead of 0.9 I chose. They insist the 1.1 cap is the right one, not 0.9
I googled and yes - the most results confirm what the seller said.
But:

- I'm a second owner, bought my car 2 years ago. Right before selling, previous owners did a full inspection at the dealer. There are bunch of recommendations in those inspection's papers - but nothing about radiator cap or cooling system whatsoever.
The dealer just overlooked the "wrong" radiator cap?..

- I've never had any issues with the cooling system since I bought my Yaris. No overheating, nothing is leaking, the ODB shows "all the sensors report no trouble codes", etc. All these 2 years with the 0.9 bar radiator cap

But now I'm confused - which on is the right one? 1.1 or 0.9?

Thanks in advance!
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Old 11-01-2018, 02:25 PM   #2
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Good question.

The GSIC manual says a new cap should test as 0.95 to 1.25 while For a used cap, the minimum acceptable reading is 0.8

This suggests to me that the 1.1 cap is more likely to be the correctone, but the 0.9 cap would be an acceptable substitute.
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Old 11-01-2018, 02:34 PM   #3
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Either would be fine. The dealer never mentioned it as it is well within spec for them. I also doubt they go to the lengths of testing a rad cap for an inspection.

You're over thinking it, either will work and you will not notice a difference for a daily driver.
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Old 11-03-2018, 05:01 PM   #4
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1.1 is fine. all it is for is protection of the cooling system. if you are overheating, it will not matter which one you have.
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Old 11-03-2018, 06:44 PM   #5
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i use the TRD uprated one.
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Old 11-15-2018, 05:14 PM   #6
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kevinj93, that's a very interesting information, thank you. May I ask where did you get the GSIC manual?

tmontague, probably you're right about overthinking, but as long as I learn something new - I'm fine with it :-)

Thank you everyone for your help and comments, much appreciated.
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Old 11-15-2018, 05:45 PM   #7
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Love the profile pics, NorthernGirl.
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Old 11-15-2018, 05:45 PM   #8
DarkShadowFox
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always go with the higher pressure cap, why risk boilover?
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Old 11-16-2018, 01:18 AM   #9
kevinj93
 
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GSIC

DarkShadowFox originally posted a link to download the GSIC.

A quick check shows he has since deleted it. It's about a 100MB zip file. I have uploaded it to my Google Drive. You can download it here:

https://drive.google.com/file/d/1-fp...ew?usp=sharing
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Old 11-19-2018, 07:24 PM   #10
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DarkShadowFox, it's not about going higher or lower - it's about finding the right one. From what I know, it's better to use what is supposed to be used, which is why I was wondering.

bentjazz, thank you! She loves to travel

kevinj93, downloaded, thank you very much!
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Old 11-20-2018, 12:09 PM   #11
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Quote:
Originally Posted by NorthernGirl View Post
DarkShadowFox, it's not about going higher or lower - it's about finding the right one. From what I know, it's better to use what is supposed to be used, which is why I was wondering.

bentjazz, thank you! She loves to travel

kevinj93, downloaded, thank you very much!
been using the TRD cap for about a year now.
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Old 12-29-2018, 08:27 AM   #12
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Should I be worried

I noticed the small round rubber that is normally attached to the rad cap is no longer there. I don't know where it fell off to but I wonder if it fell into the radiator. I already changed the cap but should I be worried of any possible damage to my cooling system?
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