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  • Member
  • Member For: 13y 3m 26d
  • Gender: Male
  • Location: QLD

Hi All,

Can someone please confirm if the coolant reservoir is supposed to have an overflow hole at the bottom or not?

Mine is leaking from the bottom and I am just unsure if it's cracked or just deliberately overflowing due to a failed thermostat. The thermostat pipe also is showing signs of a failed o-ring with spots of burnt coolant. I have ordered a new thermostat but just not sure if I should be ordering a new reservoir or not..

Also my reservoir is a replacement item I picked up from ebay recently..

Thanks heaps.

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https://www.fordxr6turbo.com/forum/topic/82647-coolant-reservoir-leaking-help/
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  • Donating Members
  • Member For: 16y 6m 1d
  • Gender: Male
  • Location: SE Melbourne

No does not have overflow. If it isn't genuine there could be a small one near the cap. Check all hoses to make sure they are on properly and clamped.

  • Member
  • Member For: 13y 3m 26d
  • Gender: Male
  • Location: QLD

It's definately the reservoir that's leaking from the bottom, can't believe anyone would bother selling a product that fails so quickly..

So does a thermostat failure cause excess pressure in the coolant system?

Edited by xr6boosted
  • Donating Members
  • Member For: 16y 2m 16d
  • Gender: Male
  • Location: Melbourne
Also my reservoir is a replacement item I picked up from ebay recently

+

Higher operating temp from a faulty thermostat will cause excess pressure

and Bang theres your problem

same thing with a work ute

Edited by KeddyXR6T
  • Member
  • Member For: 13y 3m 26d
  • Gender: Male
  • Location: QLD

Probably no point swapping out the reservoir until the new thermostat arrives, don't want to cook another one..

Funny thing is, the temperature gauge hasn't moved.

Thanks for your help guys.

Edited by xr6boosted
  • Me
  • Donating Members
  • Member For: 18y 1m 25d
  • Gender: Male
  • Location: Adelaide

Some temp guages won't register if theres no coolant in the system. Obviously yours has coolant cause its leaking but don't rely on temp guage when driving.

  • Bronze Donating Members
  • Member For: 13y 9m 26d
  • Gender: Male

Actually becasue the falcons use a cylinder head temp sensor which is an ntc thermistor it will register high temp when not in contact with coolant, theres probably nothing wrong with your thermostat but its easy to test with a kettle full of water, id say the header tank is just stuffed, not uncommon

  • Member
  • Member For: 13y 3m 26d
  • Gender: Male
  • Location: QLD

Also FYI - The coolant reservoir does have an overflow hole at the bottom that runs straight down the centre from the side of the cap at the top. I have a feeling this is the weak point of where mine is leaking from.

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