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Coolant problem


Best Answer Paul_S , 24 July 2018 - 08:20 PM

I can see why they said it was the head gasket because that's a classic sign.  The cooling system can be over-pressurised by the combustion process when the head gasket fails.

 

But, that said, I've never heard of this happening to a 350Z or 370Z.  I think Greg has more than likely given you the answer :)

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#1 Trebornaiefif

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Posted 23 July 2018 - 04:44 PM

Why is coolant coming out of filler cap the z has been standing for a year but started every week. Went for mot and mechanic told me that it was leaking out of filler cap does anyone have an idea why this is happening

#2 Greg Warnes

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Posted 23 July 2018 - 04:53 PM

Coolant filler cap has a built in pressure relief device, its probably got weak due to age.

 

Replace the filler cap and hopefully that will sort that  :thumbs:


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#3 Greg Warnes

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Posted 23 July 2018 - 04:55 PM

https://www.ebay.co....or cap&_sacat=0


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#4 Trebornaiefif

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Posted 23 July 2018 - 07:00 PM

Thanks for your input. The car has been standing for a year while I was in Canada. My buddy had the task of running the engine every week whilst I was away. Is it a common problem with the 350z. A friend just scared me to hell saying it will be the head gasket blown, hell I hope not.

#5 Greg Warnes

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Posted 23 July 2018 - 07:38 PM

Its not too common on the 350z but then there are not many built compared to other cars.

 

If your head gasket had gone you would have what looks like mayonnaise on the inside of your Oil Filler Cap.

 

Feel free to post a picture of where the leak is coming from


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#6 Chubbs

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Posted 23 July 2018 - 08:31 PM

A new filler cap would be the first thing I'd try. Make sure it's the correct specs/pressure.


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#7 LESmo

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Posted 24 July 2018 - 05:47 AM

He definately said Oil Filler Cap? 

Was the mileage the same when you got back - tyres not warn down.   No Trips out by your mate drifting.....  :lol:


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#8 Chubbs

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Posted 24 July 2018 - 06:10 AM

He definately said Oil Filler Cap?

 

We assumed he meant COOLANT filler cap, Les.


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#9 Greg Warnes

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Posted 24 July 2018 - 06:28 AM

He definately said Oil Filler Cap? 

Was the mieage the same when you got back - tyres not warn down.   No Trips out by your mate drifting.....  :lol:

 

Should have gone to spec savers  :D


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#10 JohnFK

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Posted 24 July 2018 - 07:17 AM

Op doesn't mention "oil" and doesn't appear to have been edited.


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#11 Trebornaiefif

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Posted 24 July 2018 - 07:24 AM

Just spoke to garage owner, he drove car round the back to test centre, went to test emissions on different rev cycles and he noticed water spurting out of cooler expansion bottle. I asked him his worst reason for it and he said head gasket. He also said that the battery was dead as a dodo he had to use the jump box and maybe because of the battery being duff the cooling fans didn’t work and that may be the problem. By the way it’s not the oil filler cap,!,
Thanks for the replies
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#12 Greg Warnes

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Posted 24 July 2018 - 07:45 AM

Cooling fans are notorious for not working.

 

With the car running and air con on, both fans should be running.

 

If they are not spinning (sometimes flicking them will get them started, but watch your fingers!)

 

I ended up overhauling my fans, there will be some info on the forum about how to do so.


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#13 Trebornaiefif

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Posted 24 July 2018 - 10:38 AM

I can’t find any info on cooling fas overhaul

#14 Chubbs

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Posted 24 July 2018 - 12:03 PM

I did a quick search and found these...

 

http://forums.nissan...l=+cooling +fan

 

http://forums.nissan...l=+cooling +fan


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#15 Trebornaiefif

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Posted 24 July 2018 - 07:45 PM

Thanks zedmiester
I’ve seen that vid o you tube.
I’ve now had a reason for the overheating and guess what it’s bothe cooling fans not working. So now I know I can sort it. Thank you all for your inputs
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#16 Paul_S

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Posted 24 July 2018 - 08:20 PM   Best Answer

I can see why they said it was the head gasket because that's a classic sign.  The cooling system can be over-pressurised by the combustion process when the head gasket fails.

 

But, that said, I've never heard of this happening to a 350Z or 370Z.  I think Greg has more than likely given you the answer :)


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