GR Yaris Coolant loss? Should i be worried...

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Steveoexige

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As per the title, I noticed some dried coolant on the side of the reservoir and not sure if it's a coincidence but my GR has recently been idling approx 300 rpm higher than usual.

It's seems to be running fine and I have noticed any high temps but it's a worry nonetheless. I've cleaned off the dried coolant and will keep an eye on it for anymore.
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Not a great sign. A couple of people on the other forum have had similar issues and it was the head gasket........I would get it into the dealer ASAP.
 
On fiesta’s it’s common for the coolant reservoir to crack above the point where the two moulded sections are joined, this allows small amount of coolant to escape.

I wouldn’t say this will cause an issue at the moment, but I’d get it checked out

300rpm higher? Were you in gear (clutch in and gear the car will raise rpm) Or on a cold start. I can’t see why the car would increase idle speed. There won’t be a sensor related to this small amount of coolant loss

Has it been in for a service? Wonder if they have checked the coolant and spilled a bit
 
What is the black thing next to the coolant filler cap? Is that a pressure relief valve that’s been capped off or is it working?

I remember someone posting on ‘the other place’ about their coolant leaking on track. Here it is:

www.gr-yaris.co.uk

Why Toyota did not put a Coolants overflow tank for GR Yaris

when I first get Gr Yaris I was curious looking around engine bay I notice Toyota block coolant vent with cap I was like this might develop a problem On my first track day outside temperature was Around 29c , so my coolant stay around 100c On my sec track day last mo , out side temperature...
www.gr-yaris.co.uk www.gr-yaris.co.uk

Coolant leak aside, I would get Toyota to check it based on the high idle. With the car warmed up and in neutral (no clutch, as Mintmansam said, as that does this by design) it should not being idling higher.
 
If you go to page 3 of the thread linked below and scroll down you will see a picture exactly the same as the one the original poster put here. That ended up being the head gasket. I'd get it into Toyota ASAP, unless you have mods which could void the warranty in which case get those off first.

gr-yaris.co.uk

Missfire

And why would an airlock cause misfires? Unless I misunderstood something? Something in the system is pressuring it ,forcing it to blow the cap on the expansion bottle, I still recon it is cracked head or gasket! Like I said when stop it and start it after a run say 10 mins it starts on 2...
gr-yaris.co.uk gr-yaris.co.uk
 
What is the correct procedure to measure coolant - power off or car running? Mine has different level depending if car is on or off..
 
I'm keeping an eye on it but I reckon it's just coolant leaking from running hot (as per the thread above about the GR not having a coolant overflow tank). I did a track day at Bedford in the searing heat and the GR performed faultlessly for 40+ fast laps.

Even the idling seems to have returned to normal. Maybe it just needed a damn good thrashing!
 
Unequal levels in your tank. When engine is cold (@Michael Knight), open the cap and that black plug (6mm Allen key) and let the levels even out, should look a bit better then. Don't overtighten the black plug when reinstalling, 2Nm only iirc.
 
i got a bit of coolant loss when i was in scotland :p

the small black "bung" on the side is actually the overflow from the pressure cap and hence it dumps coolant on the side of the header tank...

the round fitting with the hex fitting is a bleed point for the cooling system
 
Might be worth checking your fans are plugged in too - someone on the other side suffered from overheating in the recent hot weather and it was because his fans had been left unplugged, probably following a service/recall a few months back. Only became apparent once stuck in a traffic jam in this hot weather. See thread with a picture here: https://www.gr-yaris.co.uk/forum/threads/engine-overheating-warning.9045/
 
Weird issue after track stint - shut down car and when turned power back on got error ’coolant too hot’ and water temp gauge almost in max - not sure if flect works when engine is off ( very strange for a turbo car if it does not).

Need to ask my maintenance rep shop what they think of it but to me it feels not normal
 
Any update on this?

I have a Cupra 300 with the EA888 engine and they are prone to coolant leaks from the bottle and the water pump, without any damage to the head gasket. On the EA888 engine, it is just a bottle and / or water pump replacement & job done.
 
Michael Knight said:
Weird issue after track stint - shut down car and when turned power back on got error ’coolant too hot’ and water temp gauge almost in max - not sure if flect works when engine is off ( very strange for a turbo car if it does not).

Need to ask my maintenance rep shop what they think of it but to me it feels not normal
Click to expand...
Car has no fan Operating when shut down so proper manual cool down is required
 
Martin GR4 said:
Any update on this?

I have a Cupra 300 with the EA888 engine and they are prone to coolant leaks from the bottle and the water pump, without any damage to the head gasket. On the EA888 engine, it is just a bottle and / or water pump replacement & job done.
Click to expand...
Had one, thermostat was as prone as the water pump.
Both are usually done together it's that common now despite 8 revisions of the parts,one of the reasons I got rid for the gr
 
j22b said:
Had one, thermostat was as prone as the water pump.
Both are usually done together it's that common now despite 8 revisions of the parts,one of the reasons I got rid for the gr
Click to expand...
TBF, we've had ours since new & zero issues to date. I've extended the warranty (which I know covers this issue), so if it fails, it will get sorted.
 
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