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Oil like residue in radiator cap


MalindaG
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Although the pictures aren't clearly showing the problem, I think you mean an oily layer floating on top of the coolant under the cap?  Two cases as far as my experience goes:

1)There's alot of rust in your radiator

OR

2) You have a failed head gasket. 

Start the car with the radiator cap open (make sure no one is standing nearby) and take a peek and see if there are bubbles coming up. If so, you have a failed gasket. 

Edited by AVANTE
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3 hours ago, MalindaG said:

Hi All,

 

Can an expert tell me why there's oil like residue deposited under the radiator cap...??

I did a radiator flush in January...

Vehicle - Toyota Vios 2003

20200309_110611.jpg

20200309_110508.jpg

I dont really see  big issue here, newer coolants have a bit of an oily component, 

It is most certainly not diluted enough. 

Also if oil was mixing with coolant it will be like greyish or brownish. 

Also the bubbling, some cars, esp diesels have water pumps that can agitate the flow to mimick bubbling, so a trained mechanics eye may help than self diagnosis. 

 

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21 minutes ago, tiv said:

Also the bubbling, some cars, esp diesels have water pumps that can agitate the flow to mimick bubbling, so a trained mechanics eye may help than self diagnosis. 

 

Oops, I should have mentioned 'alot of of bubbles'. 

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